Instruction Manualmini CORI-FLOW ML120(Ultra) Low Flow
Coriolis Mass Flow Meters / Controllers
Doc. no.: 9.17.097 rev. O

Date: 14-06-2023

ATTENTION
Please read this document carefully before installing and operating the product.
Not following the guidelines could result in personal injury and/or damage to the equipment.
Keep this document for future reference.

Bronkhorst®

Copyright© 2023 Bronkhorst High-Tech B.V. - All rights reserved.
Bronkhorst® is a registered trademark of Bronkhorst High-Tech B.V.
All other trademarks are the property of their respective owners.

Disclaimer

The illustrations in this document serve to provide general notices regarding correct operation. The illustrations are
simplified representations of the actual situation and may differ from the actual product.
Bronkhorst High-Tech B.V. reserves the right to modify or improve its products and documentation without notice. Prior towork, check whether a newer version of this document is available on the Bronkhorst website.

Symbols in this document

Important information. Disregarding this information could increase the risk of damage to the equipment, or the risk of
personal injuries.
Tips, useful information, attention points. This will facilitate the use of the instrument and/or contribute to its optimal
performance.
Additional information available in the referenced documentation, on the indicated website(s) or from your Bronkhorst
representative.

Receipt of equipment

Check the outside packaging box for damage incurred during shipment. If the box is damaged, the local carrier must be
notified at once regarding his liability. At the same time a report should be submitted to your Bronkhorst representative.
Carefully remove the equipment from the box. Verify that the contents of the package was not damaged during shipment.
Should the equipment be damaged, the local carrier must be notified at once regarding his liability. At the same time areport should be submitted to your Bronkhorst representative.
If the product is damaged, it should not be put into service. In that case, contact your Bronkhorst representative for service.
· Check the packing list to ensure that you received all items included in the scope of delivery.
· Do not discard spare or replacement parts.

See Removal and return instructions for information about return shipment procedures.

Equipment storage· The equipment should be stored in its original package in a climate controlled storage location.
· Care should be taken not to subject the equipment to excessive temperatures or humidity.
· See technical specifications (data sheet) for information about required storage conditions.

2

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

Warranty

Bronkhorst® products are warranted against defects in material and workmanship for a period of three years from the dateof shipment, provided they are used in accordance with the ordering specifications and not subject to abuse or physicaldamage. Products that do not operate properly during this period may be repaired or replaced at no charge. Repairs arenormally warranted for one year or the balance of the original warranty, whichever is the longer.
See also section 9 (Guarantee) of the Conditions of sales:
www.bronkhorst.com/int/about/conditions-of-sales/
The warranty includes all initial and latent defects, random failures, and indeterminable internal causes. It excludes failuresand damage caused by the customer, such as contamination, improper electrical hook-up, physical shock etc.
Re-conditioning of products primarily returned for warranty service that is partly or wholly judged non-warranty may becharged for.
Bronkhorst High-Tech B.V. or affiliated company prepays outgoing freight charges when any part of the service isperformed under warranty, unless otherwise agreed upon beforehand. The costs of unstamped returns are added to therepair invoice. Import and/or export charges as well as costs of foreign shipping methods and/or carriers are paid by thecustomer.

General safety precautions

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety
precautions required to prevent possible injury. Read the operating information carefully before using the product.
Before operating, make sure the line cord is connected to a properly grounded power receptacle. Inspect the connecting
cables for cracks or breaks before each use.
The equipment and accessories must be used in accordance with their specifications and operating instructions, otherwise
the safety of the equipment may be impaired.
Opening the equipment is not allowed. There are no user serviceable parts inside. In case of a defect please return theequipment to Bronkhorst High-Tech B.V.
One or more warning signs may be attached to the product. These signs have the following meaning:
General warning; consult the instruction manual for handling instructions
Surface may get hot during operation
Shock hazard; electrical parts inside
To maintain protection from electric shock and fire, replacement components must be obtained from Bronkhorst. Standard
fuses, with applicable national safety approvals, may be used if the rating and type are the same. Non-safety related
components may be obtained from other suppliers, as long as they are equivalent to the original component. Selected parts
should be obtained only through Bronkhorst, to maintain accuracy and functionality of the product. If you are unsure
about the suitability of a replacement component, contact your Bronkhorst representative for information.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

3

Bronkhorst®

4

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

Table of contents1.........................................................................................................7
Introduction

1.2
1.3

Intended. . use............................................................................................................7
Product .description.............................................................................................................7

1.1

1.4
1.5
1.6
1.7
1.8

Scope of. .this. . . . manual........................................................................................................7

Calibration..............................................................................................................8
Maintenance..............................................................................................................8
Documentation..............................................................................................................9
Model key
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Customized. . . . . . I/O. . . .options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Starting up

2.2

Operating. . . . conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.1
2.2.1
2.2.2
2.3
2.4
2.5
2.6
2.7
2.8

2.8.1
2.8.2

2.8.2.1
2.8.2.2
2.8.3

2.8.3.1
2.8.3.2
2.8.3.3
2.9

2.10
2.11

2.11.1
2.11.2
2.12

Functional. . . . .properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Tested .pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Sealing. material. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Piping requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Leak check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preventing. . . . . hydraulic. . . . . . . . . . shocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electrical. . .connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Communication. . . . . . . . . . interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Analog. or. . . local. . . . . interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Digital .RS232. . . . . . interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
E-8000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
BRIGHT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Digital .RS485. . . . . . interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FLOW-BUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Modbus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Other fieldbuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Micro switch. . . . . . .operation. . . . . . . . . . .and
. . . . LED. . . . .indications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Purging. . before. . . . . . . use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Zeroing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Zeroing. . using. . . . . . micro. . . . . . .switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Zeroing. . through. . . . . . . . . digital. . . . . . . communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Powering. . . .up
. . . and. . . . .powering. . . . . . . . . . down
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.1.1

Instrument. . . . . settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.1

3.1.2
3.2
3.3
3.4

3.4.1
3.4.2
3.4.3
3.5

3.5.1

Mass flow. . . . measurement. . . . . . . . . . . . . . . and. . . . .control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Valve safe
. . . . state. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Temperature. . . . . . . considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Analog. operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Basic RS232. . . . . .operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
FlowDDE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Software. . . (DDE
. . . . . .applications). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Baud rate,. . . . node
. . . . . . address. . . . . . . . .and
. . . . parity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Basic RS485. . . . . .operation. . . . . . . . . . (FLOW-BUS/Modbus). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
FLOW-BUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

9.17.097N

Instruction Manual mini CORI-FLOW ML120

5

Bronkhorst®
3.5.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Modbus3.5.4

Baud rate,. . . . node
. . . . . . address. . . . . . . . .and
. . . . parity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.5.3
3.6
3.7
3.8

3.8.1
3.8.2
3.8.3
3.8.4

Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Other fieldbus. . . . . . . . .configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
LED indications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Multifunctional. . . . . . . . . .switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Normal. operating. . . . . . . . . . . functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Power-up. . . .functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Control. .mode. . . . . . -. .readout/change. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Network. . .settings. . . . . . . . -. .readout/change. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Digital parameters

4.2

Device .identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4.1
4.3

4.3.1
4.4
4.5
4.6
4.7

4.7.1
4.8

4.8.1
4.9

4.10

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Measurement. . . . . . . . and. . . . .control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Advanced. . . . measurement. . . . . . . . . . . . . . .and
. . . . control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Counter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Network. . .configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Special. parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Default. control. . . . . . . . mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Fluid set
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Advanced. . . . fluid. . . . . set. . . . parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Master/slave. . . . . . .configuration. . . . . . . . . . . . . . .(FLOW-BUS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

5

. . . . .with. . . . . .CORI-FILL™
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Batch dosing

5.1.1

Proportional. . . . . . .control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

5.1

5.1.2
5.1.3
5.2
5.3

5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.4

Dosing. principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Preventing. . . . . overshoot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Estimated. . . . dosing. . . . . . . .time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Process. .conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Parameter. . . . settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Dosing. method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Batch settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Overrun. . correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Disabling. . . .filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Proportional. . . . . . .control. . . . . . . .settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
On/off .control. . . . . . . .settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Optimizing. . . . . hints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

6

. . . . . . . . . .and
. . . . .service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Troubleshooting

6.2

Common. . . issues. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

6.1
6.3

Restoring. . . .factory. . . . . . . settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7

Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

7.2

Disposal. . .(end. . . . .of. . .lifetime). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

7.1

Removal. . .and. . . . return. . . . . . . instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Parameter index

6

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

1

Introduction

1.1

Scope of this manual

1.2

Intended use

This manual contains general product information, installation and operating instructions and troubleshooting tips for themini CORI-FLOW ML120 series mass flow meters and controllers for liquids and gases.

The Bronkhorst® series mini CORI-FLOW ML120 is an accurate mass-flow meter/controller for measuring gas and liquid
flows at pressures up to 200 bar(a) depending on body rating, virtually independent of pressure and temperature changes.
The mini CORI-FLOW is a real mass-flow meter/controller and measures the flow in mass, it does not matter what theproperties of the gases or liquids are. The system can be completed with an internal piezo control valve and a flexible
readout unit to measure and control gas and liquid flows.
The wetted materials incorporated in the mini CORI-FLOW ML120 are compatible with media and conditions (e.g.
pressure, temperature) as specified at ordering time. If you are planning to use the product (including any third party
components supplied by Bronkhorst, such as pumps or valves) with other media and/or other conditions, always check thewetted materials (including seals) for compatibility. See the technical specifications of the product and consult third party
documentation (if applicable) to check the incorporated materials.
Responsibility for the use of the equipment with regard to its intended use, suitability for the intended application, cleaning
and compatibility of process media with the applied materials lies solely with the user.
The user is responsible for taking the necessary safety measures to prevent damage and/or injury while working with theequipment and process media (as described in the associated Material Safety Data Sheets).
Where appropriate, this document recommends or prescribes safety measures to be taken with respect to media usage orworking with the described equipment under the specified conditions. However, this does not relieve the user of
aforementioned responsibility, not even if such is not explicitly recommended or prescribed in this document.
Bronkhorst High-Tech B.V. cannot be held liable for any damage and/or injury resulting from unintended, improper or
unsafe use, or use with other media and/or under other process conditions than specified at ordering time.

1.3

Product description

mini CORI-FLOW ML120 instruments by Bronkhorst® are precise and compact Mass Flow Meters and Controllers for liquids
and gases, based on the Coriolis measuring principle. Designed to cover the needs of the (ultra) low flow market, from 5 g/h
up to 200 g/h (full scale values), the mini CORI-FLOW offers multi-range functionality: factory calibrated ranges can berescaled by the user, maintaining the original accuracy specifications.
Measuring principle
Instruments of the mini CORI-FLOW series contain a uniquely shaped, single loop sensor tube, forming part of an
oscillating system. When a fluid flows through the tube, the Coriolis force causes a phase shift, which is detected by sensors
and fed into the integrated printed circuit board. The resulting output signal is proportional to the real mass flow rate,
independent of fluid density, temperature, viscosity, pressure, heat capacity or conductivity. Coriolis mass flow
measurement is fast, accurate and inherently bi-directional. The mini CORI-FLOW ML120 features density and temperatureof the fluid as secondary outputs.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

7

Bronkhorst®
Multi-range
The mini CORI-FLOW ML120 offers multi-range functionality: factory calibrated ranges can be re-ranged to a different fullscale range (e..g. a mini CORI-FLOW model ML120 can be used for full scale ranges between 5 g/h and 200 g/h). The analog
output and the digital measured value are scaled accordingly.
Switching between ranges can be done using the RS232 interface or the fieldbus interface. For RS232 communication,
Bronkhorst offers free tooling software (FlowPlot).
The instrument comes with a calibration certificate for all supported full scale ranges. The actual full scale of the instrument
is set to a value as ordered and can be found on the serial number label.
Accuracy
The accuracy of a mini CORI-FLOW is either 0.2% reading for liquids or 0.5% reading for gases, based on mass flow (e.g. g/h,
kg/h, etc.). Using the instrument for measuring volume flows (e.g. l/h, ml/min) will introduce an additional inaccuracy, basedon the actual density measured by the instrument. In all instruments capable of density measurement there will be an
automatic adjustment for change in density.
CORI-FILL™
mini CORI-FLOW instruments with firmware version 1.05g and up are equipped with CORI-FILL™ technology, designed forfast and highly accurate mass or volume batch dosing of liquids or gases. The internal batch dosing controller is optimized
for controlling a valve or a (gear) pump, to deliver an exact batch dose, independent of fluid properties, ambient
temperature and back pressure.

1.4

Calibration

The mini CORI-FLOW has been factory calibrated. Periodical inspection, recalibration or verification of the accuracy may besubject to individual requirements of the user. Whenever necessary, contact your Bronkhorst representative for information
and/or making arrangements for recalibration.
Bronkhorst certifies that the instrument meets the rated accuracy. Calibration has been performed using measurement
standards traceable to the Dutch Metrology Institute (VSL).
Unless specified otherwise, mini CORI-FLOW ML120 instruments are H 20 calibrated.

1.5

MaintenanceInexpertly servicing instruments can lead to serious personal injury and/or damage to the instrument or the system it isused in. Servicing must therefore be performed by trained and qualified personnel. Contact your Bronkhorst representative
for information about cleaning and calibration. Bronkhorst has trained staff available.

· The mini CORI-FLOW needs no regular maintenance if operated properly, with clean media, compatible with the wetted

materials, avoiding pressure and thermal shocks and vibrations.

· The instrument's fluid path (the wetted parts) may be purged with a clean, dry and inert gas or flushed with a non-aggressive and non-corrosive cleaning liquid.

· In case of severe contamination, cleaning the the wetted parts may be necessary.

8

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

1.6

Documentation

The documentation listed in the following table is available on the mini CORI-FLOW product pages underwww.bronkhorst.com/products

Type

Document name

Document no.

Brochuresmini CORI-FLOW Brochure9.60.056

Manuals

Instruction Manual mini CORI-FLOW ML120 (this document)

9.17.097

Quick Installation Guide mini CORI-FLOW

9.17.093

Hook-up diagram Analog/RS232

9.16.132

Hook-up diagram CANopen

9.16.218

Hook-up diagram DeviceNet™

9.16.135

Hook-up diagram EtherCAT®

9.16.137

Hook-up diagram EtherNet/IP

9.16.222

Hook-up diagram FLOW-BUS

9.16.133

Hook-up diagram Modbus ASCII / RTU

9.16.136

Hook-up diagram Modbus TCP

9.16.235

Hook-up diagram POWERLINK

9.16.237

Hook-up diagram PROFIBUS DP

9.16.134

Hook-up diagram PROFINET

9.16.146

Hook-up diagram optional bus and I/O configurations

9.16.131

Dimensional drawing

7.05.925

Technical documentation

The documentation listed in the following table can be downloaded from www.bronkhorst.com/downloads
Type

Document

Document no.

General documentation

EU Declaration of Conformity

9.06.021

Manuals

Manual CANopen interface

9.17.131

Manual DeviceNet™ interface

9.17.026

Manual EtherCAT® interface

9.17.063

Manual EtherNet/IP interface

9.17.132

Manual FLOW-BUS interface

9.17.024

Manual Modbus ASCII / RTU / TCP interface

9.17.035

Manual POWERLINK interface

9.17.142

Manual PROFIBUS DP interface

9.17.025

Manual PROFINET interface

9.17.095

Manual RS232 interface

9.17.027

9.17.097N

Instruction Manual mini CORI-FLOW ML120

9

Bronkhorst®

1.7

Model key

1.8

Customized I/O options

The model key on the serial number label contains information about the technical properties of the instrument as ordered.
The specific properties can be retrieved with the diagram below.

mini CORI-FLOW ML120 instruments offer several customized input/output functions through pin 5 of the M12 connector
as an option. The required I/O options are factory installed as specified at ordering time, and cannot be changed manually.
The possible configurations are described in the table below. See the hook-up diagram for custom bus and I/O
configurations (document 9.16.118) for an explanation of the codes.
Code

Description

000

Disabled, pin 5 is pulled down to 0 Vdc (default selection)

A1V

0…10 Vdc sourcing output, controller
Analog signal for pump or external valve steering (control signal only).
When the controller output is used for pump or external valve steering (only applicable to mass flow
meters with the controller function enabled), make sure to set parameter Valve maximum to 0.3 [A]. For mass
flow controllers, the controller output signal represents the valve actuator current. This output is limited toa value below 10 Vdc, due to the maximum valve current restriction.

B1V

4…20 mA sourcing output, controller
Analog signal for pump or external valve steering (control signal only).
When the controller output is used for pump or external valve steering (only applicable to mass flow
meters with the controller function enabled), make sure to set parameter Valve maximum to 0.3 [A]. For mass
flow controllers, the controller output signal represents the valve actuator current. This output is limited toa value below 20mA, due to the maximum valve current restriction.

C3A

Digital output, min/max alarm
During a min/max alarm, pin 5 is pulled down to 0 Vdc.

C4A

Digital output, counter alarm
During a counter alarm, pin 5 is pulled down to 0 Vdc.

10

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Code

Description

C5S

Digital output, enabled by setpoint (for shut-off control)
Pin 5 is pulled down to 0 Vdc at a controller setpoint, e.g. for shut-off
valve activation.
For factory selected analog control (…-A#-C5S):
If parameter Control mode is set for analog control by factory, theminimum setpoint at which the device (shut-off valve) connected to pin 5
is activated is 1.9%. This prevents possible noise on the analog input
activating the device accidentally.

Example for C5S or C0I hook-up

For factory selected digital control (…-D#-C5S):
If parameter Control mode is set for digital control by factory, the setpoint threshold for activating thedevice connected to pin 5 is any value > 0.
Note: If the instrument is forced into Valve Safe State, the digital output is not affected, so a (n/c) shut-off
valve connected to pin 5 will not close when the (n/c) controller is in Valve Safe State.
Make sure to use 24 Vdc power supply corresponding to the shut-off valve specifications. Cable 7.03.572 (Tpart 9-pin D-sub/loose end) or 7.03.603 (T-part 9-pin D-sub/DIN43650C) can be used for this operating
option.
C0I

Digital output, high/low switch using remote parameter (e.g. for shut-off valve control)
Pin 5 is pulled down to 0 Vdc when writing value 1 to parameter IO switch status, this is undone by writing
value 0.
A device connected to pin 5 (e.g. a shut-off valve) can be activated/deactivated by writing parameter IO
switch status.
Note: If the instrument is forced into Valve Safe State, the digital output is also affected, so a (n/c) shut-off
valve connected to pin 5 will be closed when the (n/c) controller is in Valve Safe State.
Make sure to use 24 Vdc power supply corresponding to the shut-off valve specifications. Cable 7.03.572 (Tpart 9-pin D-sub/loose end) or 7.03.603 (T-part 9-pin D-sub/DIN43650C) can be used for this operating
option.

D9E

Digital frequency output, measure
Measurement value is translated to a frequency within given frequency range.
The default frequency range to represent 0…100% flow is 0…10000 Hz. Any other frequency range must be
specified on order.

F9B

Digital pulse output, batch counter
Pin 5 is pulled down to 0 Vdc when a given batch size isreached (during a given pulse length).
By default, a pulse is given at each 1x the Counter unit batchvalue, with a pulse length of 1 second. For instance, whenCounter unit is set to 'ln', a pulse is given each time 1 ln has
passed through the instrument. An alternative pulse lengthmust be specified on order.
Example for F9B hook-up

Provide a pull-up resistor of 5…10 kOhm to create 15…24 Vdc at pin 5 (according to the applicable hook-up
diagram).
I3C

Digital input, controller mode valve close
Valve closes when pin 5 is connected to 0 Vdc.
This option switches between the default Control mode and mode ‘Valve Close’ (value 3). When the default
Control mode is digital, the default value is 0 (bus/RS-232), when the default Control mode is analog, thedefault value is 1 (Analog input).

9.17.097N

Instruction Manual mini CORI-FLOW ML120

11

Bronkhorst®
Code

Description

I8C

Digital input, controller mode valve purge
Valve is fully opened when pin 5 is connected to 0 Vdc.
This option switches between the default Control mode and mode ‘Valve Fully Open’ (value 8). When thedefault Control mode is digital, the default value is 0 (bus/RS-232), when the default Control mode is analog,
the default value is 1 (Analog input).

I1R

Digital input, reset counter
The counter resets when pin 5 is connected to 0 Vdc.

Example for I1R or I2R hook-up

I2R

12

Digital input, reset alarm
The alarm resets when pin 5 is connected to 0 Vdc.

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

2

2.1

Starting up

Functional properties

Before installing your mini CORI-FLOW ML120, check the serial number label on the rear side of the
instrument to see if the functional properties match your requirements:· Flow rate
· Fluid to be measured· Up- and downstream pressures· Temperature· Valve type (NO= Normally Open)· Input/output signal (see also Electrical connection)

The Lab-style instrument housing is rated at IP40.

2.2

2.2.1

Operating conditions
Tested pressuremini CORI-FLOW instruments are pressure tested to at least 1.7 times the specified operating pressure,with a minimum of 340 bar(a) for meters and 8.5 bar(a) for controllers. Each instrument is also
outboard leak tested to at least 2*10-9 mbar l/s Helium.
The tested pressure is specified on the instrument with a red sticker. If this sticker is missing or if the specified pressure isinsufficient, the instrument must not be used and should be returned to the factory.
Before installation, make sure that the tested pressure is in accordance with the safety factor of your application. The testedpressure must always be higher than the maximum operating pressure.
Disassembling the instrument and/or replacing parts of it will invalidate the pressure test specification.

2.2.2

Sealing material

mini CORI-FLOW ML120 instruments are equipped with specific sealing material(s), compatible with the media specified
at ordering time. Be sure that the sealing materials are compatible with the media and conditions used in the system. Do
not exceed the indicated maximum operating pressure and temperature. Bronkhorst High-Tech B.V. cannot be held
responsible for any damage resulting from the use of other media and/or conditions than specified at ordering time.

mini CORI-FLOW ML120V00 instruments are metal sealed.
mini CORI-FLOW ML120V21 instruments are equipped ex factory with internal sealings in the piezo-valve, compatible withthe media specified at ordering time. As a factory standard, the instruments are provided with Kalrez® (FFKM) seals.

2.3

Piping requirements

MAKE SURE THAT THE PIPING IS ABSOLUTELY CLEAN!
Particles can damage or clog the instrument. The piezo valve’s metal membrane can be seriously damaged by particles in
the fluid.
During the manufacturing process, the instrument has been tested with water. Despite the fact that it has been purged
thoroughly afterward, the instrument cannot be guaranteed to be absolutely free of water droplets upon delivery. For
applications where remaining water particles might cause undesired reactions, such as corrosion, Bronkhorst strongly
recommends performing an additional, adequate drying procedure.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

13

Bronkhorst®

2.4

Mounting

For the mini CORI-FLOW ML120 proper stable mounting is strongly advised ona rigid, solid base for optimal accuracy. For optimal isolation from vibrations in
the area, rubber suspension pads can be used.
The picture to the right shows an example of a mini CORI-FLOW ML120 with amass block, one of the options Bronkhorst can provide for isolation fromvibrations in the environment where the instrument is used.

2.5

Leak check

Bronkhorst® mini CORI-FLOW meters/controllers are fitted with compression or face-seal-fittings.
For leak tight installation of compression type fittings make sure that the tube is inserted to the shoulder in the fitting
body and that no dirt or dust is present on tube, ferrules or fittings. Tighten the nut finger-tight while holding the
instrument and then tighten the nut 1 turn.
If applicable follow the guidelines of the supplier of the fittings. Special types of fittings are available on request.
Check the fluid system for leak tightness after any modification and before applying full operating pressure, especially whenusing hazardous media (e.g. toxic or flammable).
After using the mini CORI-FLOW for the first time with low temperature media, re-tighten the fluid connections, in order toprevent leakage.

2.6

Preventing hydraulic shocks

In a fluid system where fluid movement (liquid or gas) is forced to stop or start suddenly (by a pump or a shut-off valve), a
hydraulic shock (or fluid hammer) can occur, especially if the fluid velocity is high. This momentum change causes apressure surge (spike) moving back and forth between the ends of the pipe. Rapid pressure fluctuations like this can cause
leakage and damage to fluid lines and components, and ultimately damage to the instrument.
The following measures can be taken to prevent or minimize hydraulic shocks:· Avoid abrupt fluid acceleration and deceleration.

o Avoid large pipe diameter transitions by using piping and tubing with an inside diameter that matches that of the
instrument as closely as possible.
o Keep the fluid velocity through the instrument as low as possible.
· Install an accumulator to dampen acceleration and deceleration of the fluid flow.
Consult your Bronkhorst representative if you need more information about prevention of hydraulic shocks.

2.7

Electrical connection

Electrical connection must be made with standard cables or according to the applicable hook-up diagrams. The factory
installed 9-pin D-sub settings are indicated on the serial number label. Make sure that the power supply is suitable for the
power ratings as indicated on the serial number label and that double or reinforced insulation is used for the power supply.
Bronkhorst recommends using their standard cables. These cables have the right connectors and if loose ends are used,
these are marked to prevent wrong connection.
mini CORI-FLOW ML120 instruments are powered with +15…+24 Vdc. See the hook-up and cabling examples in section
Communication interface
Never power the instrument simultaneously from two different power sources (e.g. fieldbus and Plug-in Power Supply).
Doing so will irreversibly damage the printed circuit board and the instrument will have to be repaired before it can beused.
In order to be able to comply with all applicable guidelines and regulations, it is essential that electrical connections be
made by or under supervision of a qualified electrician.

14

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
· The equipment described in this document contains electronic components that are susceptible to electrostatic

discharge.

· When working on the electrical installation, take appropriate measures to prevent damage as a result of electrostatic

discharge.

The CE mark on the equipment indicates that it complies with requirements imposed by the European Union, including
electromagnetic compatibility (EMC).
EMC can only be guaranteed by applying appropriate cables and connectors or gland assemblies:· Cable wire diameters must be sufficient to carry the supply current and minimize voltage loss.
· When connecting the product to other devices, ensure that the integrity of the shielding remains uncompromised; useshielded cables and connectors where possible and/or required.

· Preferably use the supplied cables (if applicable) to make electrical (signal) connections to and between the suppliedcomponents. These cables are shielded, have the required wire diameter, and loose ends (if applicable) are marked tofacilitate correct connection.

If not all requirements for proper shielding can be met (for example, because a component is not equipped with shielded
connectors), take the following measures to ensure the best possible shielding:· Keep cable lengths at a minimum.
· Route cables as closely as possible alongside metal structures or components.
· Ensure all electrical components are grounded to earth.
When in doubt about the shielding of your cabling and/or electrical connections, contact your Bronkhorst representative.

2.8

Communication interface

The table below shows the different (fieldbus) interfaces that can be installed. LED indications and the use of the micro
switch button on top of the instrument are explained in LED indications and Multifunctional switch respectively.

Analog/RS232

Ethernet variants

An analog and (digital) RS232 interface are always available on mini CORI-FLOW ML120 instruments. A fieldbus interface is
optional.
· The analog and RS232 interface are made available through a 9-pin D-sub connector on the side of the instrumento see Analog or local interface and Digital RS232 interface· FLOW-BUS and Modbus communication is possible through the 9-pin D-sub side connector, as well as via an optional

fieldbus connector on the top of the instrumento see Digital RS485 interface· All other fieldbus interfaces are strictly made available through a connector on top of the instrumento see Digital RS485 interface

2.8.1

Analog or local interface

Connect the mini CORI-FLOW ML120 instrument to the power supply/readout unit using a cable with 9-pin D-sub connector
according to the Bronkhorst® standard for the Sub-D9 connector.
Refer to the hook-up diagram for analog operation (document 9.16.119) or use a 9-pin D-sub loose-end cable (7.03.004 (3m),7.03.536 (5m) or 7.03.537 (10m)) to connect the required signals.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

15

Bronkhorst®
Power: +15...+24 Vdc

Analog output: 0...5 Vdc / 0...10 Vdc
0...20 mA / 4...20 mA

Analog input(controller): 0...5 Vdc / 0...10 Vdc
0...20 mA / 4...20mA

The following analog signals are available through the 9-pin D-sub side connector:· Pin 2: measured value (analog output)· Pin 3: setpoint (analog input)
The factory selected analog interface (0…5 Vdc; 0…10 Vdc; 0…20 mA or 4…20 mA) can be found in the model key of the
instrument (see Model key) and in the pin description on the serial number label.
When operating the instrument through the analog interface it is possible to connect the instrument simultaneously to
RS232 for reading/changing parameters (e.g. settings or fluid selection).

2.8.2

Digital RS232 interface

A special T-part cable (7.03.366) is required for connecting the
9-pin D-sub side connector of a mini CORI-FLOW ML120
instrument to a COM port of a Windows computer for RS232
communication. Optionally use an RS232 to USB2.0 converter(9.09.122) to connect to a USB port. Use a Plug-in Power Supply(PiPS) (7.03.422) for powering the instrument.
Alternatively use a 9-pin D-sub loose-end cable and refer tothe hook-up diagram for RS232 operation (document 9.16.119)
to connect the required signals, typically for connection to a
PLC or micro controller device.
If an instrument is powered through the (optional) bus
connector on top of the instrument, the 9-pin D-sub sideconnector can be connected to a COM port directly, using a Tpart cable 7.03.366 or an RS232 cable 7.03.367. The figure on theright shows a hook-up example for DeviceNet™.
Keep in mind that the 9-pin D-sub configuration of a Bronkhorst® instrument differs from the 9-pin D-sub configuration of
a PC COM-port. Make sure the correct cables are used for hook-up. When in doubt, always check the hook-up diagrams
associated with the instruments.
· Consult Instruction manual PiPS (document no. 9.17.055) for more information about the Plug-in Power Supply· Consult Instruction manual RS232 interface (document no. 9.17.027) for more information about hook-up andcommunication

Both documents can be downloaded from www.bronkhorst.com/downloads

2.8.2.1

E-8000

When a mini CORI-FLOW ML120 instrument is used in
combination with an E-8000 readout/ control unit equippedwith an RS232 interface, the instrument can be powered andoperated using the 9-pin D-sub (female) connector at the rearof the E-8000 module and a cable 7.03.016 or equivalent. With
the display interface and control buttons most digital
parameters can be used. See the E-8000 manual (document
9.17.076) for more information.

16

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
2.8.2.2

BRIGHT

2.8.3

Digital RS485 interface

When a mini CORI-FLOW ML120 instrument is used in
combination with a BRIGHT readout and control module, mostdigital functions are available by using the display interface
and control buttons. If a BRIGHT module is connected, no other
RS232 communication with the instrument can be established.
For more information see the BRIGHT manual (document
9.17.048).

With digital operation over RS485 or Ethernet a fieldbus system with multiple instruments can be set up. This section shows
examples of several of mini CORI-FLOW ML120 instruments in an RS485 fieldbus system. Note that many other bus
configurations are possible, contact your local sales representative for more information. Please check the total power
consumption of your instruments and do not exceed the maximum power of the power supply.
For all fieldbus systems the mini CORI-FLOW ML120 instruments serve as slaves on the master/slave bus system. There is no
mutual communication between slaves, only between master and slave.

2.8.3.1

FLOW-BUS

In the image below an E-8000 power supply/readout control unit with FLOW-BUS interface is connected to two mini CORIFLOW ML120 instruments via the RJ-45 top-connector FLOW-BUS interface. In this example one instrument serves as 'local
host' for communicating with a Windows computer to all instruments on the bus via an available RS232 connector. Note:communication with all the instruments on the FLOW-BUS system is possible when using an mini CORI-FLOW ML120
instrument as local-host RS232/FLOW-BUS interface. It is also possible to use multiple local-host RS232/FLOW-BUS interfaces
in a FLOW-BUS system simultaneously.

Power the instruments in a FLOW-BUS local-host system by hooking-up the power supply directly on the FLOW-BUS line
and not by powering a set of instruments through the 9-pin D-sub connector on one of the digital instruments.
Consult Instruction manual FLOW-BUS interface (document no. 9.17.024) for more information about hook-up andcommunication.

2.8.3.2

ModbusIn the example below the Modbus power supply is provided by an E-8000. The instruments are connected to the bus via
RS485 cables with RJ-45 connector and a Multiport connector. The RS485 - USB2.0 adapter can be used to connect the system
to a Modbus master device.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

17

Bronkhorst®

· See Instruction manual Modbus interface (document no. 9.17.035) for more information about hook-up andcommunication.

· See Instruction manual E-8000 (document no. 9.17.076) for more information about power supply andcommunication options of the E-8000.

2.8.3.3

Other fieldbuses

2.9

Micro switch operation and LED indications

For other fieldbuses consult the concerning fieldbus manual.

Using the two colored LEDs and the micro switch on the instrument,
several actions can be monitored and started.
· The green
LED is used for status indication.
· The red
LED is used for errors, warnings and messages.
· The switch can be used to start several actions, such as auto-zero,
restore factory settings and bus-initialization actions, if applicable.

ll

For the zero-procedure see Zeroing.
For an overview of all possible LED indications, see LED indications.
The micro switch on top of the mini CORI-FLOW ML120 can be operated with a thin, metal or hard plastic pin, e.g. theend of a paperclip. Avoid excessive force when operating the switch.

2.10

Purging before use

In systems for use with corrosive, reactive or explosive media, purging for at least 30 minutes with a dry, inert gas (likeNitrogen or Argon) is absolutely necessary before use. After use with corrosive or reactive fluids, complete purging is also
required before exposing the system to air.
Prevent chemical reactions inside the tubes or instrument as this will tend to clog up or corrode the system.

2.11

ZeroingZeroing of a mini CORI-FLOW instrument is required each time process conditions have been changed.
What is zero-stability?
Due to mechanical construction of the sensor tubes each mini CORI-FLOW sensor will have a very small offset signal, evenwhen the mass flow is zero. This is called the zero-stability error and is specified for accuracy separately for all Coriolis
instruments. Main reason for this is the fact that this error can be (temporarily) neutralized after performing a zero-action.
Immediately after zeroing, zero-stability error is 0%. However, it is allowed to move between a certain band depending on
the environment (process) and fluid conditions.
In ideal situations, where actual process conditions do not change, this error will remain the same.
See below for possible reasons of change of zero-stability.
18

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

Model*

DN (mm)Zero-stability< 0.01 g/h

ML120
0.25
* Zero-stability depends on the (mini) CORI-FLOW model

Nominal flow
100 g/hIn practice zero-stability turns out to be better than the values in the table, but for calculation we will take worst casevalues.

Process conditions
Each time process conditions have been changed significantly a (mini) CORI-FLOW needs to be zeroed in order to get rid of
the offset error due to zero-stability. At least the very first time an instrument is used a zero procedure will be required.
The zero-stability error will mainly change when one or more of the following items change significantly:· Temperature (of fluid or environment)· Mounting of the (mini) CORI-FLOW instrument
Less important items:· Pressure· Density of fluid· Vibrations working on instrument via environment· Pulsation of supply pressure working on instrument
Zero Procedure
There are two ways to perform zeroing of a (mini) CORI-FLOW instrument:
1. With the micro-switch
2. Through digital communication
Always make sure that there is absolutely no flow when the instrument is performing the (auto-)zero procedure and there
are no mechanical vibrations or pulsating inlet pressures.

If the instrument has problems finding a proper and stable zero, it will repeat the auto-zero procedure up to 4 times. Eachtime when no proper zero can be achieved, the instrument will give a short notice, signaling its LEDs after the procedure.
The red and green LED will blink alternating for a few seconds to indicate that the auto-zero was not able to find a zero
point (because of too much noise in the signal). This is mostly the case when the instrument is placed in a vibrating
environment. When ready zeroing after trying max. 4 times, the final result for the zero value will be a moving averagevalue of all attempts. The instrument will save this zero value into its non-volatile memory and will keep this value until thenext zero-procedure is performed. The mini CORI-FLOW will accept a proper zero point only if the measured signal is within
a limited noise band. Best way to achieve this is to avoid external noise influences. However, when this is not possible, filter
settings of the mini CORI-FLOW can be changed to improve noise immunity.

2.11.1 Zeroing using micro switch

The zero-point of each instrument is factory adjusted. If so required the zero point may be re-adjusted
over RS232, fieldbus or by means of using the micro switch.
Procedure for zeroing by micro switch:

1. Set process conditions
Warm-up (for a minimum of 30 minutes), pressurize the system and fill the instrument according to the process
conditions.
2. Stop flow
Make sure no flow is going through the instrument by closing valves near the instrument. The setpoint must be zero.
3. Press and hold, until the GREEN LED is on, then release button
Press the micro switch and hold it. After a short time the red LED will go ON and OFF, then the green LED will go
ON. At that moment (which is 8...12 s after pressing) release the switch.
4. Zeroing
The zeroing procedure will start at that moment and the green LED will blink fast. The procedure will takeapproximately 60 seconds.
5. Ready
When the indication is showing 0% signal and the green indication LED is glowing continuously again, the zeroing
action was successful.

l

l

l

l

9.17.097N

Instruction Manual mini CORI-FLOW ML120

19

Bronkhorst®

2.11.2 Zeroing through digital communication

It is also possible to start the zero adjustment procedure through digital communication:· Through FLOW-BUS, using an E-8000 readout/control module· Through FLOW-BUS, via a RS232/FLOW-BUS converter using software on a PC or PLC· Through RS232, using software on a Windows computer or a PLC· Through RS232, using a BRIGHT compact local readout/control module· Through other fieldbus system (PROFIBUS DP/DeviceNet™/Modbus)
1. Set process conditions
Warm up and pressurize the system and fill the instrument according to the process conditions.
2. Stop flow
Make sure there is no flow through the instrument by closing the shut-off valves before and after the instrument.
3. Send parameters
Send the following parameter values in this sequence:o Init Reset: 64
o Control Mode: 9o Calibration Mode: 255
o Calibration Mode: 0o Calibration Mode: 9
4. Zeroing
The zeroing procedure will start at that moment and the green LED will blink fast. The zeroing procedure waits for astable signal and saves the zero. If the signal is not stable zeroing, it will take a long time and the nearest point to zerois accepted. The procedure will take approximately 60 seconds.
Make sure there is no flow through the instrument when performing the zeroing procedure.
5. Ready
When indication is showing 0% signal and the green indication LED is glowing continuously again, then zeroing has
succeeded. Parameter Control Mode reverts to its original value. As last send 0 to parameter Init Reset.

2.12

Powering up and powering down

To maintain control of the fluid system and ensure a safe situation, it is recommended to turn on power before applying
fluid pressure and to switch off power only after the fluid system is depressurized.
When pressurizing, prevent pressure shocks by gradually bringing the fluid system to the required operating pressure.
For best performance, allow the device to warm up and stabilize for at least 30 minutes before starting measurement
and/or control. This may be done with or without media flow.
Make sure (in case of a controller) that the used control valve can withstand the system pressure and the maximum delta
pressure allowed.
After powering up, the control valve will act according the last known setpoint. When setpoint is 0, this means the valve
closes (normally open) or stays closed (normally closed). The valve stays closed until the instrument receives a new valid
setpoint from the active setpoint source.

20

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

3

3.1

Operation

Mass flow measurement and control

After correct installation of the mini CORI-FLOW ML120 Mass Flow Meter (MFM) or Mass Flow Controller (MFC), and when
all safety precautions have been taken into account, the instrument can be used for measuring/ controlling the required
flow rate in the system by means of the selected communication interface(s).
When an MFC (eitherwith normally closed(N.C.) or normallyopen (N.O.) valve) ishooked-up, thecontrol valve stays
closed as long as no
setpoint is given.
When the MFC
receives a setpointfrom the active
setpoint source, theinternal controller will
immediately open thecontrol valve until therequired flow rate isachieved. It will
maintain that flowrate until anothersetpoint is given.

mini CORI-FLOW ML120 instruments are most accurate with the specified media, at the specified inlet/outlet pressure
and temperature, as specified by the customer at ordering time. However, the instrument will function properly in a wide
range of varying conditions. If the actual process conditions differ significantly from the conditions for which the
instrument is set, the FlowTune™ software can be used to set the correct process conditions.
Although mini CORI-FLOW ML120 instruments have excellent temperature stability, the best accuracy is achieved whentemperature gradients across the instruments are avoided. Make sure that the media temperature matches the ambient
temperature as good as possible and mount the instruments on a rigid (heat conducting) surface.
mini CORI-FLOW ML120 instruments handle pressure shocks in the system well, but are not insensitive to pressure
fluctuations. For optimum control stability, provide a stable (pressure controlled) inlet pressure with sufficient buffer
volume between the pressure regulator and the instrument and avoid installing multiple instruments or control valves inclose proximity to another with small volume piping in between.

3.1.1

Instrument settings

This window allows the user to read and change several settings of digital meters and controllers. Changing theseparameters requires special knowledge about the instruments and the behavior of the instruments. This document may not
be enough to optimize an instrument. Bronkhorst offers special trainings for field users for this. Please ask your local
representative about this. From the moment the window appears, it will take a few seconds to read all the actual parametervalues and update the screen. After that, changing a setting will immediately send the change to the instrument and theeffect of the change can be viewed in the plot window.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

21

Bronkhorst®
Channel & control mode
0 – Bus/RS232: Digital setpoint via fieldbus or RS232
1 – Analog input: Setpoint via analog input
3 – Valve fully closed: Valve fully closed and stays closed under all circumstances
8 – Valve fully open
: Valve fully opened (purge) and stays opened under all
circumstances
11 – Keyboard & FLOW-BUS : Setpoint via E-8000 keyboard, bus or RS232
Capacity and unit
· Unit type: Selects the flow measurement· Mass flow
· Volume flow
· Full scale value: Selection of the Full scale
Sensor zero
Auto zero: adjustment of zero point
Notes: Instrument must be warmed up, no flow may flow during auto zero

3.1.2

Valve safe state

When a controlling instrument is not powered or cannot communicate with the fieldbus network (if applicable), all electricalvalves operated by the instrument (whether integrated or external) automatically return to their default state. The default
state is closed for 'normally closed' valves (n/c) and fully open for 'normally open' valves (n/o).
Check the serial number label or the technical specifications to see which valve type is used on your instrument (ifapplicable).

3.2

Temperature considerations

Although the mini CORI-FLOW has excellent temperature stability, the best accuracy is achieved when temperature
gradients within and across the instrument are avoided. Take the following guidelines into account:· To avoid simultaneous heating and cooling of different parts of the instrument, make sure the ambient temperature is

as stable and evenly distributed across the environment as possible.

· Avoid temperature shocks; heating or cooling should amount to no more than 1 °C per second.
· Make sure that the media temperature matches the ambient temperature as closely as possible.
· The mini CORI-FLOW will show an amount of self heating, due to power dissipation of the electronics. This effect can beas large as approximately 15 °C (depending on media and ambient temperature). In practice, there will be a balance
between media temperature, self heating and ambient temperature.
· Operation in a cool environment can compensate somewhat for the effect of high media temperatures.
· Heating and cooling effects will also depend on the cooling/heat conducting capacities of the installation itself on which
the instrument is mounted.
· To prevent damage to the electronics, make sure the temperature in the housing never exceeds 70°C. To monitor this,the internal temperature reading can be used (parameter Temperature).

· The storage temperature should lie between -30 and 80 °C. Make sure the measuring tube is purged and dry before

storing the instrument.

22

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Temperature build-up
The temperature in the instrument housing is largely determined by the media temperature (T fluid) and the ambient
temperature (T ambient). Although these temperatures cannot simply be added up to calculate the internal temperature,they do amplify each other. Taking the self heating effect of the electronics into account, some rules of thumb can be
defined for the maximum temperatures and their sum to observe. The graph below illustrates these; the area below eachline represents the safe temperatures for the according instruments or circumstances.

The following rules can be inferred from this graph:With normal, continuous operation:· T fluid + T ambient should remain lower than 110 °C· T fluid should lie between 0 and 100 °C· T ambient should lie between 0 and 55 °C

When cleaning (without electrical power to the instrument):· T fluid + T ambient should remain lower than 130°C· T fluid should lie between 0 and 130 °C· T ambient should lie between 0 and 80 °C

3.3

Analog operation

With analog operation the following parameters are available:- output signal: measured value- input signal: setpoint (controller only)
Using analog and digital interfaces simultaneously
The instrument can be operated via the analog and digital interfaces (RS232/fieldbus) at the same time. When using
multiple interfaces, reading of parameters can be done simultaneously. When changing parameter values, the last value
sent by any of the interfaces will be valid.
Control mode
The instrument accepts a setpoint from either the analog or digital interface, but not both. This default control mode isselected at ordering time.

3.4

Basic RS232 operation

Connecting the instrument with an RS232 cable or an RS232 cable with a USB to RS232 converter to a Windows computer
enables using the free Bronkhorst® software for Windows, such as FlowDDE and FlowPlot.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

23

Bronkhorst®
Digital operation (RS-232 or fieldbus) adds extra features to the instrument, such as:· Direct reading with a readout/control module or host computer· Diagnostics· Multi-range functionality· Device identification· Adjustable minimum and maximum alarm limits (Alarms)· (Batch) counter (Counter)

Make sure in FlowDDE the correct port and baud rate are selected. For RS232 operation the baud rate must be 38400
Baud.

3.4.1

FlowDDE

Digital Bronkhorst® instruments can be operated via RS-232 using the Bronkhorst® FlowDDE server application. Dynamic
Data Exchange (DDE) provides a basic level of inter process communication between Windows applications. Together with aclient application, either self-made or with a third party SCADA program, it is possible to create an easy way of dataexchange between the flow meter/controller and a Windows application. For instance, a cell in a Microsoft Excel
spreadsheet can be linked to the measured value of an instrument; FlowDDE updates the cell automatically when themeasured value changes.
FlowDDE uses specific parameter numbers for communicating with the instrument. A DDE parameter number is a unique
number in a special FlowDDE instruments/parameter database and not the same as the parameter number from the process
on an instrument. FlowDDE translates the node-address and process number to a channel number.
DDE-client applications communicate with the FlowDDE server by using DDE messages. Before messages can be exchanged,
a DDE link has to be made. A DDE link consists of three parts: the server, the topic and an item. For separation the characters'|' and '!' may be used, so a DDE link in e.g. Microsoft Excel becomes: Server|Topic!Item.
For standard instrument parameters and the FlowDDE server, these are:
· Server: FlowDDE or FlowDDE2· Topic: ‘C(X)’ for channel number X· Item: ‘P(Y)’ for parameter number Y

An example of a DDE link in a Microsoft Excel cell is =FlowDDE|’C(1)’!’P(8)’ to read parameter 8 of channel 1.
When not using FlowDDE for communication with the
instrument, parameters are addressed by:· Node address· Process number· Parameter number
See section Digital parameters for more information about
instrument parameters.

For more information about FlowDDE, including setting up a DDE link, consult the FlowDDE Manual (document no.
9.17.067) or the help file in the application.

24

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

3.4.2

Software (DDE applications)

Examples of free Bronkhorst® DDE client applications: FlowPlot and FlowView. Other software programs supporting DDE arefor example MS-Office, LabVIEW, InTouch and Wizcon.

Bronkhorst® software applications 'FlowView' (left) and 'FlowPlot' (right)

FlowDDE and other Bronkhorst® applications are available on the support CD or can be downloaded from the productpages on the Bronkhorst website: www.bronkhorst.com/products

3.4.3

Baud rate, node address and parity

mini CORI-FLOW ML120 instruments support the following baud rates for RS232 communication. The factory selected baudrate is indicated on the serial number label. Refer to Digital parameters - Network configuration for changing the baud ratesettings for the instrument. The default baud rate for RS232 communication is 38400 Baud.
Interface/medium:

RS232

Protocol:FLOW-BUS

Baud rate:

Node address:

3

Parity:

None

9600
16200
38400
57600
115200230400460800Make sure that the instrument’s baud rate corresponds with the baud rate of the application the instrument iscommunicating with, otherwise no communication can be established.
For RS232 communication, the maximum cable length is 10 m for baud rates up to 38400 Baud. For higher baud rates,
use cable lengths of maximum 3 m.
Changes made to the network settings will not be restored by a factory reset.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

25

Bronkhorst®
Consult Instruction manual RS232 interface (document no. 9.17.027) for more information about RS232
communication

3.5

Basic RS485 operation (FLOW-BUS/Modbus)

3.5.1

FLOW-BUS

FLOW-BUS or Modbus communication is available if either a FLOW-BUS or Modbus (RJ-45) connector on top of the
instrument is present, or if the 9-pin D-sub side connector is set for FLOW-BUS or Modbus communication.

FLOW-BUS is a Bronkhorst® designed fieldbus, based on RS485 technology, for digital communication between devices,offering the possibility of host-control by a Windows computer.
Characteristics:· Baud rates of 187500 (default) or 400000 Baud· +15…24 Vdc supply voltage· Easy installation and communication with other Bronkhorst® devices· Automatic node search and bus optimization (gap fixing)· PC communication via (local host) FLOW-BUS – RS232 interface· Connection of max. 120 instruments on a single bus· Maximum bus length: 600 m
Consult Instruction manual FLOW-BUS interface (document no. 9.17.024) for more information about FLOW-BUS
communication.

3.5.2

ModbusModbus is a 3-wire, RS485-based fieldbus communication system for parameter value exchange. In this system each
instrument/device is equipped with a micro controller for its own dedicated task but also for exchanging parameter value
information with other devices connected to the same Modbus system. In a Modbus system Bronkhorst® instruments
always serve as Modbus slaves. There is no mutual communication between Modbus slaves, only between master and slave.
The master device is for example a Windows computer.
Characteristics:· Several selectable baud rates between 9600 and 256000 Baud (default: 19200 Baud)· +15…24 Vdc supply voltage· connection of max. 247 instruments on a single bus· supports RTU and ASCII protocols
Consult Instruction manual Modbus interface (document no. 9.17.035) for more information about Modbus
communication.
Detailed information about Modbus can be found at www.modbus.org or the website of the Modbus organization inyour country (if available).

3.5.3

Software

When using a Windows computer to communicate with mini CORI-FLOW ML120 instruments only the FLOW-BUS protocol
is supported by Bronkhorst® software. When using Modbus operation, software from third parties, such as LabVIEW,
ModScan or a Modbus PLC must be used to serve as Modbus master.
An instrument with 9-pin D-sub side connector set for RS485 FLOW-BUS or Modbus communication will not respond whenconnecting to an RS232 configuration. If the instrument is not set for RS232 communication, use the micro switch on topof the instrument to overrule the custom settings and switch to RS232 communication settings: press and hold the micro
switch at power-up and wait (12…16 sec) until both green and red LEDs flash (0.2 sec on, 0.2 sec off). Release the switch toactivate the ‘Configuration Mode’. In the ‘Configuration Mode’ the bus type and baud rate for the 9-pin D-sub sideconnector are set to RS232 FLOW-BUS (ProPar) at 38400 Baud. The ‘Configuration Mode’ remains active after power down.
Use the same procedure to deactivate the ‘Configuration Mode’.

3.5.4

Baud rate, node address and parity

mini CORI-FLOW ML120 instruments are configured ex factory. If there is a need of changing any of the specified RS485
settings, see the tables below for the supported configurations. The default selections are printed in boldface.

26

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Interface/medium:

RS485

Protocol:FLOW-BUS

Baud rate:

187500400000Node address:

3…125

Modbus RTU

9600
19200
38400
56000
57600
115200128000256000

9600
19200
38400
56000
57600
115200128000256000

1…247

None

Parity:Modbus ASCII

1…247

None; Even; Odd

None; Even; Odd

Changing RS485 settings of the RJ-45 top connector interface
In case the FLOW-BUS or Modbus RJ-45 fieldbus connector is used for bus
communication, the node address can be easily set by using the rotary switches on
the side of the instrument. Use the ‘MSD’ (Most Significant Digit) to set the ‘tens’ of
the bus-address and the ‘LSD’ (least Significant Digit) to set the ‘unit’ of the busaddress (the example on the right reads ‘63’). Set the rotary switches to '00' for
automatic installation. Refer to the corresponding fieldbus manual, document
9.17.024 (FLOW-BUS) or document 9.17.035 (Modbus) for more details.
For changing the baud rate or parity settings use the RS232 interface to change thecorresponding parameters. See Digital parameters - Network configuration forchanging parameters.
Changing RS485 settings of the 9-pin D-sub side connector interface
In case the 9-pin D-sub side connector is set for RS485 communication, the baud rate or node address can be changed byusing the micro switch or by changing the settings in the ‘Configuration Mode’. Refer to section Multifunctional switch forchanging node address and baud rate with the micro switch.
Other communication parameters can be changed only in configuration mode. See Multifunctional switch for entering
configuration mode. In configuration mode, bus type and baud rate are set to RS232 (FLOW-BUS/ProPar) and 38400 baud
respectively. Change the appropriate parameters as described in Digital parameters - Network configuration. When finished,deactivate configuration mode using the same procedure.
Changes made to the network settings will not be restored by a factory reset.

3.6

Other fieldbus configurations

In the table below for the supported configurations for PROFIBUS DP, DeviceNet™, EtherCAT® and PROFINET are shown. The
default selections are printed in boldface.
Connector:

9-pin D-sub (female)

5-pin M12 (male)

2x RJ45

Interface/medium:

RS485

RS485

Ethernet based

Protocol:PROFIBUS DP

DeviceNet™

Autodetect(9600)(19200)(45450)(93750)(187500)(500000)(1500000)(3000000)(6000000)(12000000)

Baud rate:

0…126

Node address:
Parity:9.17.097N

Even

125000250000500000100000000

0...630 (n/a)None

Instruction Manual mini CORI-FLOW ML120

None

27

Bronkhorst®
Changing PROFIBUS DP node address
The node address can be easily set by using the rotary switches on the side of the instrument. Use the ‘MSD’ (Most
Significant Digit) to set the ‘tens’ of the bus-address and the ‘LSD’ (least Significant Digit) to set the ‘unit’ of the bus-address.
Changing DeviceNet™ node address and data rate
The node address and data rate can be easily set by using the rotary switches on the side of the instrument. Use the‘MSD’ (Most Significant Digit) to set the ‘tens’ of the bus-address and the ‘LSD’ (least Significant Digit) to set the ‘unit’ of thebus-address. Set the 'MSD' rotary switch to 'P' to select programmable bus-address. For the data rate setting select '1' for
125000 Baud, '2' for 250000 Baud, '5' for 500000 Baud and 'P' for programmable data rate.
Changing EtherCAT® Second Address
EtherCAT® supports the use of a Second Address. Bronkhorst® instruments have 3 rotary switches, with which a Second
Address can be set in the range of 0 – 4095 (0xFFF). This value of the rotary switches will be copied to the Configured
Station Alias register (address 0x0012:0x0013) at instrument start-up.
Changes made to the network settings will not be restored by a factory reset.

3.7

LED indications

The following LED indicators are present on top of the instrument:· ‘Mode’· ‘Error’· ‘NET’· ‘MOD’· ‘Status’

LED: green
LED: red
LED: green/red
LED: green/red
LED: green/red

l
l
l /l
l /l
l /l

used for operation mode indication
used for error/warning messages
used for Network status
DeviceNet™
(
only )
used for Module status
DeviceNet™
(
only )
used for status indication
EtherCAT®
(and PROFINET only)

For EtherCAT® and PROFINET the following LED indicators are integrated in the RJ-45 connectors:
Amber LED: Ethernet Speed indicator
Green LED: Ethernet Link/Activity indicatorThe tables below list the possible indications by the LEDs on top of the instrument:l GreenPattern

Time

Indication

offContinuous

Power-off or program not runningon

Continuous

Normal Operation Modeshort flash

0.1 sec on,
2 sec off

No bus communication, valves are in safe state (PROFIBUS DP, DeviceNet™, EtherCAT®
and PROFINET only). This LED indication is also active when the instrument is in‘Initialization Mode' (Init Reset = '73')

normal flash

0.2 sec on,
0.2 sec off

Special function mode; the instrument is busy performing a special function (e.g.
auto-zero or self-test)

long flash

2 sec on,
0.1 sec off

Configuration mode; the baud rate and bus type for the 9-pin D-sub side connector
are set to 38400 and RS232 FLOW-BUS (ProPar)

Pattern

Time

Indication

offContinuous

No erroronContinuous

Critical error; the instrument needs servicing before it can be usedshort flash

0.1 sec on,
2 sec off

Fieldbus specific warning message:

l Red

28

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

l Red
Pattern

Time

Indication
FLOW-BUS
PROFIBUS DP
ModbusDeviceNet™
EtherCAT®
PROFINET

Node occupied: re-install instrument
No data exchange between master and slave (automatic recovery)
Data is being received or transmitted
Minor communication error
Instrument is not in OP modeNo application relation establishednormal flash

0.2 sec on,
0.2 sec off

Incorrect fluid set configuration (see Digital parameters - Fluid set; in this casevalves are in safe state)
AND/OR:
Fieldbus specific warning message:
Waiting for communication, check communication settings of all
FLOW-BUS
FLOW-BUS devices in the fieldbus setup. Usually the ‘last nodeaddress’ setting of one of the devices is incorrect.
PROFIBUS DP Not used
Not used
ModbusNo bus power
DeviceNet™
Not used
EtherCAT®
Not used
PROFINET

long flash

2 sec on,
0.1 sec off

Fieldbus specific warning message:
Not used
FLOW-BUS
PROFIBUS DP Requested parameter not available
Not used
ModbusSerious communication error; manual intervention needed
DeviceNet™
Configuration error
EtherCAT®
Configuration error (e.g. a requested parameter is not available)
PROFINETl Green and l red (alternating)
Wink

Time

Indication

slow wink

1 sec on,1 sec off

Alarm indication; minimum/maximum alarm, power-up alarm, limit reached or batch
reachednormal wink

0.2 sec on,
0.2 sec off

Wink mode; by sending a command to the Wink parameter, the instrument flashes its
LEDs to indicate its position in a (large) system.

fast wink

0.1 sec on,
0.1 sec off

Selected action started (after releasing the multifunctional switch)

DeviceNet™ LED indications
Specific LED indications are applicable to instruments with DeviceNet™ interface. Note: the ‘NET’ and ‘MOD’ LEDs are bicolored LEDs (green/red). Refer to the DeviceNet™ manual, document 9.17.026, for more information.
EtherCAT® LED indications
Specific LED indications are applicable to instruments with EtherCAT® interface. Refer to the EtherCAT® manual, document
9.17.063, for more information.
PROFINET LED indications
Specific LED indications are applicable to instruments with PROFINET interface. Refer to the PROFINET manual, document
9.17.095, for more information.

3.8

Multifunctional switch

The micro switch on top of the mini CORI-FLOW ML120 can be operated with a thin, metal or hard plastic pin, forexample the end of a paperclip.

Some special instrument functions can be started manually using the multifunctional switch near the indication LEDs. These
functions are available in analog as well as in digital operation mode.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

29

Bronkhorst®

3.8.1

Normal operating functions· In order to access these functions, press and hold the switch while the instrument is in normal operation mode (green

LED lit continuously).

· As long as the switch is held, the LEDs show a repeating sequence of patterns, where each pattern indicates a function.
· All patterns in this sequence are continuous.
· Each pattern is shown for a number of seconds; in the table below, the column labeled Hold time indicates the time frame

during which a pattern is shown.

· To start the required function, release the switch when the LEDs show the associated pattern.

ll(green)(red)

Hold time Function

off

off

0…1 sec

No action

off

off

1…4 sec

1. In case of a min/max alarm: reset alarm
2. FLOW-BUS: Auto-install to bus - lets instrument obtain free node address
Note: min/max alarm (if any) has to be reset before auto install can be performed.

off

on

4…8 sec

Reset instrument; clear all warnings and error messages and restart the instrument

on

off

8…12 sec Auto-zero; re-adjust the zero-point of the instrument (flow meters/controllers only)

on

on

12…16 sec Enable FLASH mode for firmware update:· the instrument shuts down and both LEDs are switched off· at the next power-up, the instrument will be active again· See Zeroing for background information and instructions on how to adjust the zero point of an instrument.
· Do not adjust the zero point before having taken notice of the instructions.

3.8.2

Power-up functions· In order to access these functions, press and hold the switch while powering up the instrument.
· As long as the switch is held, the LEDs show a repeating sequence of patterns, where each pattern indicates a function.
· All patterns in this sequence are flashing (0.2 sec on, 0.2 sec off).
· Each pattern is shown for a number of seconds; in the table below, the column labeled Hold time indicates the time frame

within the sequence during which a pattern is shown.

· To start the required function, release the switch when the LEDs show the associated pattern.

l

30

l

(green)(red)

Hold time Function

off

off

0…4 sec

No actionoffon

4…8 sec

Restore factory settings (except communication settings)

on

off

8…12 sec · FLOW-BUS: auto install to bus; let the instrument obtain a free node address fromthe FLOW-BUS system· Other protocols: no action

onon

12…16 sec Activate or deactivate configuration mode
· The 9-pin D-sub connector is set to RS-232 communication (ProPar) at baud rate
38400
· In configuration mode, the green LED blinks (2 seconds on, 0.1 second off)
· Deactivate configuration mode by selecting this function again at the next powerup

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

3.8.3

Control mode - readout/change

Reading control mode
· By briefly pressing the switch 2 times within 1 second in normal operation mode, the instrument shows its current
control mode with a series of consecutive LED indication patterns.
· The number of flashes corresponds to the current value of parameter Control Mode (see Special parameters).

Step Pattern
1

Green

2

Red

l l
l l

Indication
number of flashes indicates the tens of the parameter value
number of flashes indicates the units of the parameter value

Examples:· for value 1 (control mode 'Analog input'), the green LED will flash 0 times and the red LED 1 time
· for value 22 (control mode 'Valve Safe State'), the green and red LED will each flash 2 times

Changing control mode

· By briefly pressing the switch 4 times with intervals of up to 1 second in normal operation mode, the instrument enters astate in which the control mode can be changed.

· This is done in 2 steps, each represented by a LED indication pattern (green or red; see table below).
· The number of flashes corresponds to the available values of parameter Control Mode (see Special parameters).
· At the start of each step, the according LEDs starts flashing fast (0.1 second on, 0.1 second off). By pressing and holding

the switch, the associated action is started and the flashing slows (0.5 seconds on, 0.5 seconds off).

Step Pattern
1

Green

2

Red

l l
l l

Maximum Action
flash
count
2

set tens of parameter value

9

set units of parameter value

To execute a step, follow these instructions:· Press and hold the switch (flashing slows)· To select value 0 (zero), release the switch within 1 second, otherwise:· Count the number of LED flashes· Release the switch when the required value is reached· In case you lose count, keep the switch pressed and wait until the flash count reaches its maximum and restarts
On completion of step 1, the instrument automatically advances to step 2. When both steps have been completed, theinstrument returns to its normal operation mode.
If the switch is not pressed within 60 seconds after starting a step, all changes are canceled and the instrument returns to its
normal operation mode.
Note that this procedure also sets the default control mode of the instrument (contrary to changing the control mode
digitally).

9.17.097N

Instruction Manual mini CORI-FLOW ML120

31

Bronkhorst®

3.8.4

Network settings - readout/change

Reading network settings· By briefly pressing the switch 3 times with intervals of up to 1 second in normal operation mode, the instrument showsits current node address and baud rate with a series of consecutive LED indication patterns:

Step Pattern
1

Green

2

Red

3

Green and red(simultaneous)

l l
l l
l l

Indication
number of flashes indicates the tens of the node address
number of flashes indicates the units of the node address
number of flashes indicates the baud rate

Examples:· for node address 35, the green LED will flash 3 times and the red LED 5 times· for node address 116, the green LED will flash 11 times and the red LED 6 times
On DeviceNet™ the node address is called MAC ID.
The number of flashes for the baud rate indication is associated with the following baud rates:

Number of
flashes
FLOW-BUS(index)
0
1
2
3
4
5
6
7
8
9

10

32

187500400000Modbus(ASCII/RTU)

PROFIBUS DP

9600

19200
38400
56000
57600

115200128000256000

Baud rate

CANopenDeviceNet™

Ethernet based

9600

1000000

125000100000000

45450

500000500000automaticallydetected
19200
93750

1875005000001500000
3000000
6000000

800000250000250000125000
50000
20000
10000

12000000

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Changing network settings· By briefly pressing the switch 5 times with intervals of up to 1 second in normal operation mode, the instrument enters astate in which the node address and baud rate can be changed (non-Ethernet based protocols only; for Ethernet based
protocols, network parameters are configured by the fieldbus master and cannot be set on the instrument).
· Changing network parameters with the multifunctional switch is done in 3 steps, each represented by a LED indication
pattern (see table below).
· At the start of each step, the according LED(s) start(s) flashing fast (0.1 second on, 0.1 second off). By pressing and holding
the switch, the associated action is started and the flashing slows (0.5 seconds on, 0.5 seconds off).

Step Pattern
1

Green

2

Red

3

Green and red(simultaneous)

l l
l l
l l

Maximum Action
flash
count
12

set tens of node address

9

set units of node address

10*

set baud rate index (number of flashes)*) maximum count depends on the supported baud rates of the fieldbus. See the baud rate table above for supported baudrates and associated indexes.
To execute a step, follow these instructions:· Press and hold the switch (flashing slows)· To select value 0 (zero), release the switch within 1 second, otherwise:· Count the number of LED flashes· Release the switch as soon as the required value is reached· In case you lose count, keep the switch pressed and wait until the flash count reaches its maximum and restarts
On completion of a step, the instrument automatically advances to the next step. When all required steps have been
completed, the instrument returns to its normal operation mode.
If the switch is not pressed within 60 seconds after starting a step, all changes in the previous steps are cancelled and the
instrument returns to its normal operation mode.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

33

Bronkhorst®

4

Digital parameters

Each instrument is controlled internally by several digital parameters, most of which can only be accessed using digitalcommunication. Each communication protocol uses its own methods for communicating with instruments and accessing
parameters.
FLOW-BUS
Digital Bronkhorst® instruments can be monitored and operated using the free FlowWare software tools for Windows.
These tools provide a graphical interface to the ProPar protocol (used by FLOW-BUS), for monitoring and editing parametervalues.
The FlowWare toolkit provides functionality for monitoring and operating digital instruments (Bronkhorst FlowSuite,
FlowPlot) and selection of the active fluid and configuration of the fieldbus connection (if applicable). For instruments that
support the definition and use of multiple fluids, FlowTune™ can be used to define and store fluids in the instrument andselect the active fluid.
Digital instrument parameters are made accessible by FlowDDE, a Dynamic Data Exchange server (DDE) that handles
communication between the instrument and (dedicated) client software in Windows (e.g. FlowPlot). FlowDDE can also be
used by other client applications, such as Microsoft Office or custom made software, built with third party development
software like LabVIEW or a SCADA platform.
The FlowWare tools and associated documentation can be downloaded from the product pages on the Bronkhorst website:www.bronkhorst.com/products
ModbusIn a Modbus system instruments can be monitored and operated using third party software as a master device, such as
LabVIEW, ModScan, or a Modbus PLC.
PROFIBUS-DP
Instruments in a PROFIBUS DP system can be monitored and operated using third party software as a master device, such as
TIA Portal (by Siemens).

To operate a PROFIBUS DP device, a so-called GSD file (General Station Description) has to be loaded into the software. The
GSD file contains all necessary configuration information to operate the device in a PROFIBUS DP system, including all
available operating parameters with their data types.
A GSD file for Bronkhorst® instruments can be downloaded from the product pages on the Bronkhorst website:www.bronkhorst.com/products
DeviceNet™
Instruments in a DeviceNet™ system can be monitored and operated using third party software as a master device, such as
TIA Portal (by Siemens).

To configure a device, a so-called EDS file (Electronics Data Sheet) can be loaded into the software. The EDS file contains allnecessary configuration information to operate the device in a DeviceNet™ system, including communication and network
configuration, and all available operating parameters with their data types.
An EDS file for Bronkhorst® instruments can be downloaded from the product pages on the Bronkhorst website:www.bronkhorst.com/products
PROFINET
Instruments in a PROFINET system can be monitored and operated using third party software as a master device, such as TIA
Portal (by Siemens).

To configure a device, a so-called GSDML file (General Station Description Markup Language) can be loaded into thesoftware. The GSDML file contains all necessary information, in XML format, to operate the device in a PROFINET system,
including communication and network configuration, and all available operating parameters with their data types.
A GSDML file for Bronkhorst® instruments can be downloaded from the product pages on the Bronkhorst website:www.bronkhorst.com/products

34

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
EtherCAT®
Instruments in an EtherCAT® system can be monitored and operated using third party software as a master device, such as
SyCon® (by Hilscher GmbH).

To configure a device, a so-called ESI file (EtherCAT® Slave Information) can be loaded into the software. The ESI file contains
all necessary configuration information to operate the device in a EtherCAT® system, including communication and network
configuration, and all available operating parameters with their data types.
An ESI file for Bronkhorst® instruments can be downloaded from the product pages on the Bronkhorst website:www.bronkhorst.com/products

4.1

GeneralThis section describes the most commonly used parameters for digital operation of the mini CORI-FLOW. Descriptions aregrouped by category in tables as shown below:

Type

AccessRange

FlowDDE

FLOW-BUS

Modbus[type]

RW[x]…[y][DDE par][Pro]/[Par][address]/[register]B

In this manual, parameter names are printed in italics (reverted to normal where embedded in italics, like in this tip).
Type
Unsigned char
1 byte unsigned integer (0…255)
Unsigned int
2 byte unsigned integer, MSB first (0…65535)
Unsigned long
4 byte unsigned integer, MSB first (0…4294967295)
Float
4 byte floating point, IEEE 32-bit single precision, MSB first
Unsigned char [x] x byte text string
AccessR
W

B

Parameter value can be read
Parameter value can be written
Parameter is secured and only accepts values if parameter Init Reset is set to 'unlocked' first

Range
Some parameters only accept values within a certain range:[x]
Minimum value[y]Maximum value
FlowDDE
Parameter number within FlowDDE
FLOW-BUS
FLOW-BUS uses the ProPar protocol, where parameters are identified by a unique combination of a process number and aparameter number.
· For more information about setting up a FLOW-BUS network with Bronkhorst® instruments, consult the FLOW-BUS

manual (see Documentation).

· For more information about the ProPar protocol, consult the RS-232 manual (see Documentation).

ModbusIn the Modbus protocol, parameters are accessed by specifying their unique decimal register number or corresponding PDU
address (Protocol Data Unit). The PDU address is the hexadecimal translation of the register number minus 1, e.g. register
number 1 corresponds to PDU address 0x0000, register number 11 corresponds to PDU address 0x000A:[address]
Hexadecimal PDU address[register]
Decimal register number
Modbus address blocks are two bytes big. Larger data types use up to 8 subsequent address blocks, resulting in a
maximum variable length of 16 bytes. Values longer than the maximum length are truncated.
For more detailed information about setting up a Modbus network with Bronkhorst® instruments, consult the Modbus
manual (see Documentation).

9.17.097N

Instruction Manual mini CORI-FLOW ML120

35

Bronkhorst®

Other interface protocols
Parameter descriptions in this document are based on their availability with FLOW-BUS, Modbus or RS-232 (ProPar)
communication. Due to limitations in, for example, memory capacity or communication properties, definition files for otherfieldbus systems usually do not make all parameters available.
Not all parameters described in this document are necessarily available with all digital interface types. For information
about parameter access and availability for Bronkhorst® instruments in a specific fieldbus network, consult the according
fieldbus manual.
A summary of all digital parameters described in this section can be found in the back of this manual.

4.2

User Tag

Device identification

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[16]

RW

-

115

113/6

0xF130…0xF137/ 61745…61752

With this parameter, the instrument can be given a custom tag name, with a maximum of 16 characters.
Customer ModelType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[16]

RW

-

93

113/4

0xF120…0xF127/ 61729…61736

B

This parameter is used to add extra information to the model number information, such as a customer-specific model
number.
Serial Number

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[20]

R

-

92

113/3

0xF118…0xF11F/ 61721…61728

Instrument serial number for identification.
BHT Model Number

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[35]

RW

-

91

113/2

0xF110…0xF117/ 61713…61720

B

This parameter shows the Bronkhorst® instrument model type information.
Firmware Version

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[6]

R

-

105

113/5

0xF128…0xF12A/ 61737…61739

Revision number of the firmware
Identification Number

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

175

113/120x0E2C/3629

B

Bronkhorst® (digital) device type identification number.

36

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Device TypeType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[6]

R

-

90

113/1

0xF108…0xF10A/ 61705…61707

Device type information string; this parameter contains an abbreviation referring to the identification number.

4.3

MeasureMeasurement and control

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned int

R

0…41942(65535*)8

1/00x0020/33

This parameter returns a dimensionless representation of the measured flow rate or pressure. The value 32000 corresponds
to 100 %, the maximum value corresponds to 131.07 %.
*In case the instrument is prepared for bi-directional measurement, the negative signals with an output range of 73.73…-0.003% are represented by the range of 41943…65535, whereas the positive signals 0…131.07% are still
represented by the range of 0…41942. (FlowDDE converts the numbers to negative values automatically).
Setpoint

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned int

RW

0…32000

9

1/1

0x0021/34

This parameter is a dimensionless representation of the required flow rate or pressure. Value 32000 corresponds to 100 %.
Temperature

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

R-250…500

142

33/7

0xA138…0xA139/41273…41274

This parameter returns the temperature in °C on the outside of the sensor tube, which is an approximation of the actual
media temperature.
PressureType

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…3.4E+38

143

33/8

0xA140…0xA141/41281…41282

In case an external pressure sensor is connected, this parameter returns the actual system pressure in bar(a).
If there is no external pressure sensor, the default value of this parameter is equal to parameter Inlet pressure.
Density Actual

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

R

0…3.4E+38

270

116/150xF478…0xF479/62584…62585

This parameter returns the actual density measured by the instrument in kg/m3. If the selected Capacity Unit is a volume flow
type, the instrument uses this parameter for conversion of the measured mass flow to the selected unit.

4.3.1

fMeasure

Advanced measurement and control

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

R-3.4E+38…
3.4E+38

205

33/0

0xA100…0xA101/ 41217…41218

This parameter represents the value of parameter Measure, expressed in the selected Capacity Unit. Its value is calculated fromthe dimensionless value of Measure, using the fluid set parameters Capacity 100% and Capacity Unit.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

37

Bronkhorst®
FsetpointType

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…3.4E+38

206

33/3

0xA118…0xA119/ 41241…41242

This parameter represents the value of parameter Setpoint, expressed in the selected Capacity Unit. Conversion between
Fsetpoint and the dimensionless value of Setpoint uses fluid set parameters Capacity 100% and Capacity Unit.
Setpoint Slope

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned int

RW

0…3000010

1/2

0x0022/35

The value of this parameter represents the time it would take to adjust the setpoint if it were changed from 0 to 100 %. Thisfeature can be used to smooth 'nervous' controller behavior, e.g. to reduce setpoint overshoot or undershoot.
The supported range corresponds to 0…3000 seconds. Default value = 0.
Example:If Setpoint Slope = 100 it will take 10 seconds to adjust the setpoint if it is changed from 0 to 100%. A setpoint change of 20%
will take (20%/100%)*10 seconds = 2 seconds.
Analog Input

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned int

R

0…6553511

1/3

0x0023/36

This parameter contains a digital translation of the analog input signal (if applicable).
Valve Output

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned longRW

0…
16777215

55

114/1

0xF208…0xF209/61961…61962

This parameter represents the controller output signal for control valve operation.
Sensor TypeType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

22

1/14

0x002E/47

B

The following sensor types are supported:

Instrument type
Controller

Sensor

38

Value
0
1
2
3
4
128
129
130
131
132

Description
Pressure (counter disabled)
Liquid volume
Liquid /gas mass
Gas volume
Other (counter disabled)
Pressure (counter disabled)
Liquid volume
Liquid/gas mass
Gas volume
Other (counter disabled)

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

4.4

AlarmsAlarm settings are most easily accessible using Bronkhorst FlowSuite, FlowPlot or FlowView or a Bronkhorst® readout andcontrol unit.

The built-in alarm functionality can be used to handle different alarm types:· system errors and warnings· min/max alarms· response alarms· batch alarms· master/slave alarms
The alarm type can be set with parameter Alarm Mode. When an alarm is activated, the type can be read out using parameter
Alarm Info. An automatic setpoint change can be set using the parameters Alarm Setpoint Mode and Alarm New Setpoint. It isalso possible to set an alarm delay, to prevent overreaction to small disturbances, using parameter Alarm Delay Time. The
methods by which an alarm can be reset are controlled by Reset Alarm Enable.
Alarm Mode

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…3

118

97/3

0x0C23/3108

Available modes:

Value
0
1
2
3

Description
Alarm off
Alarm on absolute limits
Alarm on limits related to setpoint (response alarm)
Alarm at power-up(e.g. after power-down)(On DeviceNet™ instruments, only modes 0 and 1 are available)
Alarm InfoType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

R

0…255

28

1/20

0x0034/53

This parameter provides information about the event type(s) that triggered an alarm situation. The value is a bitwisesummation of the issued alarm types; convert the value to binary to see which types are issued. The following alarm types
can be issued:

Bit
0
1
2
3
4
5

Value
1
2
4
8
16
32

6
7

64
128

Alarm Delay Time

Type
Error
Warning
Minimum alarm
Maximum alarm
Batch counter alarm· This bit only: Power-up alarm· If combined with bit 2 or 3:
Response alarm
Master/slave alarm
Hardware alarm

Description
Error flag raised
Warning flag raised
Measure < Alarm minimum limit
Measure > Alarm maximum limit
Batch counter reached its limit
Alarm possibly caused by a power dip
Difference between Measure and Setpoint too big
Setpoint out of limits (caused by Slave factor)
Hardware error

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

182

97/7

0x0C27/3112

This value represents the time in seconds the alarm action will be delayed when an alarm limit has been exceeded. Thisvalue also delays the alarm off action if an alarm limit is no longer exceeded.
Default value = 0.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

39

Bronkhorst®
Alarm Maximum Limit

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned int

RW

0…32000

116

97/1

0x0C21/3106

Maximum limit for Measure to activate the maximum alarm situation (after Alarm Delay Time). Range 0…32000 represents 0…
100% signal. Alarm Maximum Limit must be greater than Alarm Minimum Limit.
Default value: 0.
Alarm Minimum Limit

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned int

RW

0…32000

117

97/2

0x0C22/3107

Minimum limit for Measure to activate the minimum alarm situation (after Alarm Delay Time). Range 0…32000 represents 0…
100% signal. Alarm Minimum Limit must be smaller than Alarm Maximum Limit.
Default value: 0.
Alarm Setpoint Mode

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…1

120

97/5

0x0C25/3110

Specifies whether or not to change the setpoint after an alarm situation is activated.

Value
0
1

Description
No setpoint change (default)
Change setpoint to Alarm new setpoint

Alarm New SetpointType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned int

RW

0…32000

121

97/6

0x0C26/3111

New (safe) setpoint during an alarm until reset. Range 0…32000 represents 0…100% setpoint.
Default value: 0
Reset Alarm Enable

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…15

156

97/9

0x0C29/3114

Available reset methods. The value is a bitwise summation of the enabled methods; convert the value to binary to see
which methods are enabled.
Default value: 15 (all bits/methods enabled)
The following methods are supported:

Bit
0
1
2
3

40

Value
1
2
4
8

Description
By hardware switch (if present)
Externally (obsolete)
By parameter Reset
Automatically (when alarm conditions no longer apply)

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

4.5

Counter· Counter settings are most easily accessible using Bronkhorst FlowSuite, FlowPlot or FlowView or a Bronkhorst® readout

and control unit.

· When the instrument is powered down, it remembers the state of the counter. If the counter is active when the

instrument is powered down, it is activated when powered up and then continues to count from the value at the time ofpower down.

Counter Mode

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…2

130

104/8

0x0D08/3337

Available modes:

Value
0
1
2

Description
Counter off (default)
Counting up continuouslyCounting up until limit reached (set by Counter Limit)

Counter Unit

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[4]RW

see table
below

128

104/7

0xE838…0xE839/59449…59450

This parameter contains the name of the counter readout unit.
Counter Unit supports the following values:

Mass

Normal volume(1.01325 bar(a), 0 °C)

Standard volume(1.01325 bar(a), 20 °C)

Custom volume(Capacity Unit Pressure,
Capacity Unit Type
Temperature)ug, mg, g, kg

uln, mln, ln,
mm3n, cm3n, dm3n, m3nuls, mls, ls,
mm3s, cm3s, dm3s, m3sul, ml, l,
mm3, cm3, dm3, m3

Parameter Density (FlowDDE ID 170) is used to calculate Custom volume.
Counter ValueType

AccessRange

FlowDDE

FLOW-BUS

Modbus

Float

RW

0…
10000000

122

104/1

0xE808…0xE809/59401…59402

Current counter value in units selected with parameter Counter Unit.
Counter Limit

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…9999999

124

104/3

0xE818…0xE819/59417…59418

Counter limit/batch size in units selected with parameter Counter Unit.
Default value: 0.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

41

Bronkhorst®
Counter Setpoint Mode

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…1

126

104/5

0x0D05/3334

Specifies whether or not to change the setpoint after reaching the counter limit.

Value
0
1

Description
No setpoint change (default)
Change setpoint to Counter new setpoint

Counter New SetpointType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned int

RW

0…32000

127

104/6

0x0D06/3335

New (safe) setpoint when a counter limit is reached until reset. Range 0…32000 represents 0…100% setpoint.
Default value: 0
Reset Counter Enable

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…15

157

104/9

0x0D09/3338

Available reset methods. The value is a bitwise summation of the enabled reset methods; convert the value to binary to see
which methods are enabled.
Default value: 7 (bits/methods 0, 1 and 2 enabled)
The following methods are supported:

Bit
0
1
2
3

Value
1
2
4
8

4.6

Network configuration

42

Description
By hardware switch (if present)
Externally (obsolete)
By parameter Reset
Automatically (e.g. when counter value is reset)

Changes made to the network settings will not be restored by a factory reset.

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Default settings
Network configuration is done ex factory as ordered. The table below shows the supported configurations for the available
interface protocols (default settings are printed in bold):

Protocol

ProPar(RS-232)

FLOW-BUS(RS-485)

Modbus(RTU/ASCII)PROFIBUS DP

CANopenDeviceNet™

Address

3

3…125

1…247

0…126

1…127

0…63

Baud Rate

9600
19200
38400
57600
115200230400460800187500400000

9600
19200
38400
56000
57600
115200128000256000(autodetect)
9600
19200
45450
93750
1875005000001500000
3000000
6000000
12000000

10000
20000
50000
1250002500005000008000001000000

125000250000500000Parity0

00, 1, 22

0

0

Network configuration for Ethernet based fieldbus types is done automatically via the Ethernet protocol.

Communication via fieldbus connection (top connector, RS485)
Using the RS232 interface, set the following parameters to configure the instrument for communication via the fieldbus
connection:
Fieldbus1 Address

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

199

125/100x0FAA/4011

Fieldbus1 Baud Rate

B

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned long

RW

0…1.0E10

201

125/9

0xFD48…0xFD49/64841…64842

Fieldbus1 Parity

B

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…2

335

125/120x0FAC/4013

B

The following values are supported:

Value
0
1
2

9.17.097N

Description
No parity
Odd parity
Even parity

Instruction Manual mini CORI-FLOW ML120

43

Bronkhorst®
Communication via standard connection (RS232/RS485)
Use the following parameters to configure the instrument for FLOW-BUS or Modbus communication via the 9-pin D-subside connector:· If the 9-pin D-sub connector is set for RS-485 communication, the instrument will not respond to an RS-232 master. In

that case, use the multifunctional switch to enter configuration mode and enable RS-232 communication.

· After configuring the required parameters, follow the same procedure to leave configuration mode and restore theoriginal communication settings (otherwise, configuration mode will remain enabled after the next power-up).

Fieldbus2 Address

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

309

124/100x0F8A/3979

Fieldbus2 Baud Rate

B

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned long

RW

0…1.0E10

310

124/9

0xFC48…0xFC49/64585…64586

Fieldbus2 Parity

B

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…2

336

124/12

0x0F8C/3981

B

The following values are supported:

Value
0
1
2

Description
No parity
Odd parity
Even parity

4.7

Special parameters

Init ResetType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

82/64

7

0/10

0x000A/11

Init Reset is used to unlock secured parameters (marked with a

Value
64
82

B symbol) for writing. It supports the following values:

Description
unlocked, secured parameters can be read and written to
locked, secured parameters are read-only

At power-up, Init Reset is always set to ‘Locked’ (value 82).
Reset

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

R

0…7

114

115/8

0x0E68/3689

This parameter is used to reset the program, counter or alarms.

44

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Value
0
1
2
3
4
5
6
7

Description
No reset
Reset counter
Reset alarm
Reset counter
Reset and disable counter
Reset firmware program (soft reset)
Reset Alarm info error bit
Reset Alarm info warning bit
The Reset parameter may be disabled by Reset Alarm Enable or Reset Counter Enable. Make sure the value is acceptedby sending value 0 first.

Wink

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char [27]

W

0…9*

1

0/0

0x0000/1

Sending any text string value between 1 and 9 to this parameter makes the indication LEDs (if present) blink for a couple ofseconds. This can be useful in order to identify a specific device in a large fieldbus network.
*) Modbus only supports value 14592
Control Mode

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

12

115/1

0x0024/37

Control Mode is used to select different control modes of the instrument and determines from which source(s) it accepts a
setpoint.
The following modes are available:

Value
0
1
2
3
4
7
8
9
10
12
13
18
20
21
22

List option
Description
Bus/RS232
Normal digital operation
Analog input
Normal analog operation
FLOW-BUS slave
Acting as slave instrument on FLOW-BUS
Valve close
Controller disabled, valve closed
Controller idle
Controller disabled, valve frozen in current position
Setpoint 100%
Setpoint fixed at 100 %Valve fully open
Controller disabled, valve fully open
Calibration mode
Calibration mode enabled
Analog slave
Acting as slave of other instrument in analog mode
Setpoint 0%
Setpoint fixed at 0%
FLOW-BUS analog slave Acting as slave of other instrument on FLOW-BUS, slave
factor set by analog input signal
RS232
Controlling, default/safe state disabled
Valve steering
Controller disabled, setpoint redirected to Valve Output
Analog valve steering Controller disabled, analog input redirected to Valve Output
Valve safe state
Instrument in default/safe state

Setpoint source
Fieldbus or RS-232
Analog input
FLOW-BUS master

Analog input
Analog input
Fieldbus or RS-232· Default value: 0 or 1 (as ordered).
· If Control Mode is changed to value 0, 1, 9 or 18, the instrument returns to the default value at the next power-up or reset.

Other values are persistent.

· Control Mode 18 prevents the instrument from assuming its default/safe state in the event of a digital communication

failure.

· The column labeled List option shows the control modes as used in Bronkhorst® software.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

45

Bronkhorst®
Calibration Mode

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW0, 9, 255

58

1/4

0x0E61/3682

B

After enabling calibration mode by means of parameter Control Mode, this parameter is used to start the autozero functionof the flow sensor. The following modes are supported:
Value
0
9
255

Description
Idle (no action)
Start zeroing
Error (result of previous calibration mode)

4.7.1

Default control mode

IO Status

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

86

114/11

0x0E4B/3660

B

The instrument is set to accept a setpoint from either an analog or a digital source. Although this setting can be changed
with parameter Control Mode, the instrument usually returns to its default control mode at every power-up or reset. The
default control mode can be set with parameter IO Status; to change it, use the procedures as described below.
Changing from digital operation to analog operation:
1. Set parameter Init Reset to 64 (unlocked)
2. Read parameter IO Status
3. Add 64 to the read value
4. Write the new value to parameter IO Status
5. Set parameter Init Reset to 82 (locked)
Changing from analog operation to digital operation:
1. Set parameter Init Reset to 64 (unlocked)
2. Read parameter IO Status
3. Subtract 64 from the read value
4. Write the new value to parameter IO Status
5. Set parameter Init Reset to 82 (locked)
The procedures described above do not change the value of parameter Control Mode. To apply the new default control
mode, reset or restart the instrument.
Do not use this procedure if one of the following customized I/O options is installed:· C5S (digital output, enabled by setpoint)· I3C (digital input, controller mode valve close)· I8C (digital input, controller mode valve purge)

4.8

Fluid set

Fluid Set Index

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…7

24

1/16

0x0030/49

With this parameter, any of the pre-configured fluids (up to 8) can be selected. Each fluid has its specific (configurable)
properties, such as Fluid Name, Capacity, etc.
Default value: 0 (fluid 1).
Note that the selected value is equal to the fluid number minus 1 (value 0 corresponds to fluid 1, value 1 to fluid 2, etc.)

46

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Fluid NameType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[10]

RW

-

25

1/17

0x8188…0x818C/33161…33165

B

This parameter contains the name of the selected fluid.
Capacity 100%

Type

AccessRange

FlowDDE

FLOW-BUS

Modbus

Float

RW

1E-10…
1E+10

21

1/13

0x8168…0x8169/33129…33130

B· This parameter represents the 100 % readout/control value (span), expressed in the Capacity Unit of the selected fluid.
· Capacity 100% is scaled when Inlet Pressure, Fluid Temperature or Fluid Name is changed for the selected fluid.

Capacity Unit

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char[7]RW

see below

129

1/31

0x81F8…0x81FB/33273…33276

B

This parameter represents the unit in which Capacity 100% is expressed.
Available units:

Mass flow

Normal volume flow
(1.01325 bar(a), 0 °C)

Standard volume flow
(1.01325 bar(a), 20 °C)

Custom volume flow
(Capacity Unit Type Pressure,
Capacity Unit Type
Temperature)ug/h, ug/min, ug/s,
mg/h, mg/min, mg/s,
g/h, g/min, g/s,
kg/h, kg/min, kg/s

uln/h, uln/min, uln/s,
mln/h, mln/min, mln/s,
ln/h, ln/min, ln/s,
ccn/h, ccn/min, ccn/s,
mm3n/h, mm3n/m,
mm3n/s,cm3n/h, cm3n/m, cm3n/s,
m3n/h, m3n/min, m3n/s,
scfh, scfm, scfs,
sccm, slm

uls/h, uls/min, uls/s,
mls/h, mls/min, mls/s,
ls/h, ls/min, ls/s,
ccs/h, ccs/min, ccs/s,
mm3s/h, mm3s/m, mm3s/s,
cm3s/h, cm3s/m, cm3s/s,
m3s/h, m3s/min, m3s/s

ul/h, ul/min, ul/s,
ml/h, ml/min, ml/s,
l/h, l/min, l/s,
cc/h, cc/min, cc/s,
mm3/h, mm3/m, mm3/s,
cm3/h, cm3/m, cm3/s,
m3/h, m3/min, m3/s,
cfh, cfm, cfs

Because of the maximum string length (7 characters), some unit names are abbreviated, for instance mm3n/m means
mm3n/min.
Capacity Unit Type Temperature

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW-273.15…
3.4E+38

245

33/10

0xA150…0xA151/41297…41298

B

This parameter defines a reference temperature for conversion of the measured mass flow to a volume flow. See also
parameters Capacity Unit and Counter Unit.
Capacity Unit Type Pressure

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…3.4E+38

246

33/11

0xA158…0xA159/41305…41306

B

This parameter defines a reference pressure for conversion of the measured mass flow to a volume flow. See also
parameters Capacity Unit and Counter Unit.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

47

Bronkhorst®

4.8.1

Advanced fluid set parameters

Note that the parameters described in this section do not contain any actual measurement values, but only fixed reference
values, which can be used for capacity calculations, etc.

Inlet Pressure

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…3.4E+38

178

113/130xF168…0xF169/61801…61802

B

Upstream pressure of the selected fluid in bar(a)Outlet Pressure

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…3.4E+38

179

113/140xF170…0xF171/61809…61810

B

Downstream pressure of the selected fluid in bar(a).
Fluid Temperature

Type

AccessRange

FlowDDE

FLOW-BUS

Modbus

Float

RW-250…500

181

113/16

0xF180…0xF181/61825…61826

B

Temperature of the selected fluid in °C.
DensityType

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…3.4E+38

170

33/21

0xA1A8…0xA1A9/41385…41386

B

Density of the selected fluid in kg/m3

4.9

Master/slave configuration (FLOW-BUS)

Normally, there is no communication between the instruments in a fieldbus system. The FLOW-BUS protocol, however,provides a feature to set up a master/slave relationship between two instruments. The typical behavior of a slave
instrument is to automatically set its own setpoint relative to the output (measurement value) of its master.
The output value of any instrument in a FLOW-BUS network is automatically available to all other instruments without
extra wiring. A slave instrument can also be a master to other instruments.
To set up a master/slave relationship between instruments, set parameter Control Mode of the slave instrument to ‘FLOWBUS slave’ (value 2) or ‘FLOW-BUS analog slave’ (value 13), depending on how the setpoint should be calculated.
The slave instrument polls the output value of its master periodically and uses the slave factor to set its own setpoint
relative to the master's.
To prevent damage to the instruments an/or the system(s) they are connected to, be sure to avoid circular references
between devices on the same fieldbus. The FLOW-BUS system does not have a protection mechanism.
Master NodeType

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

1…128

158

33/14

n/a

Sets the master node for the instrument.
Note that this parameter is only effective in a FLOW-BUS network (RS-485).

48

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Slave Factor

Type

AccessRange

FlowDDE

FLOW-BUS

Modbus

Float

RW

0…500

139

33/1

0xA108…0xA109/41225…41226

The controller output from the master instrument is multiplied by Slave Factor/100 % to get the slave instrument setpoint.
In systems other than FLOW-BUS, Slave Factor is effective only if Control Mode is set to 'Analog slave', and the analog output
signal of the master instrument is redirected to the input of the slave instrument.
Example:· master output = 80 %· Slave Factor = 50
slave instrument setpoint = 80 % x 50 %/100 % = 40 %

_

4.10

Controller

The picture below is a simplified visualization of the PID controller algorithm (proportional, integral, derivative) used bydigital Bronkhorst® instruments.

The controller speed controls the overall performance of the controller algorithm. Basically, to adjust the controller
response, only the controller speed needs to be changed.
The algorithm is based upon the difference between the setpoint and the measured value (called the error value). The
correction signal to eliminate the error is assembled from 3 components (giving the algorithm its name):· The P-action (proportional) multiplies the error value by a constant factor, to adjust the measure towards the (new)setpoint.
· The I-action (integral) amplifies the correction signal with a factor depending on the integral of the error value over time.
· The D-action (derivative) reduces the strength of the P-action, to prevent overshoot when the (new) setpoint is reached.
The proportional action is enhanced by one of three additional response factors, depending on the control cycle stage:· Open from zero: the setpoint is larger than zero and the measured value is below 2% of the full scale range.
· Normal step: the measured value differs more than 2% from the setpoint, typically after changing the setpoint (step).
· Stable situation: the measured value differs less than 2% from the setpoint.

For more information about controlling characteristics, consult the FlowPlot manual (document 9.17.030). This manual
can be downloaded from www.bronkhorst.com/downloads.
Control characteristics are optimized during production. These parameters should only be changed if absolutely necessary,and only by or under the supervision of trained service personnel.
Controller Speed

Type

AccessRange

FlowDDE

FLOW-BUS

Modbus

Float

RW

0.2…5

254

114/300xF2F0…0xF2F1/62193…62194

This parameter sets the overall controller speed factor for the selected fluid. Controller speed is set ex factory between value'0.5' (slow) and '2' (fast). The default value is '1'.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

49

Bronkhorst®
PID-KpType

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…1E+10167

114/21

0xF2A8…0xF2A9/62121…62122

B

PID controller proportional action, multiplication factor.
PID-TiType

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…1E+10168

114/220xF2B0…0xF2B1/62129…62130

B

PID controller integral action in seconds.
PID-TdType

AccessRange

FlowDDE

FLOW-BUS

ModbusFloat

RW

0…1E+10169

114/230xF2B8…0xF2B9/62137…62138

B

PID controller derivative action in seconds. The default value is 0.0.
Open From Zero Response

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

165

114/180x0E52/3667

B

Response factor, applied to proportional action when opening the valve from 0%.
· Default value: 128 (no correction)· Other values adjust the controller gain (correction signal) as follows: Controller gain = Controller Speed * PID-Kp *1.05(response factor - 128)
Normal Step Response

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

72

114/5

0x0E45/3654

B

Response factor, applied to proportional action during normal control (at setpoint step).
· Default value: 128 (no correction)· Other values adjust the controller gain (correction signal) as follows: Controller gain = Controller Speed * PID-Kp *1.05(response factor - 128)
Stable Situation Response

Type

AccessRange

FlowDDE

FLOW-BUS

ModbusUnsigned char

RW

0…255

141

114/17

0x0E51/3666

B

Stable situation response, applied when the controller is stable (within a 2% band around the setpoint).
· Default value: 128 (no correction)· Other values adjust the controller gain (correction signal) as follows: Controller gain = Controller Speed * PID-Kp *1.05(response factor - 128)50

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

5

Batch dosing with CORI-FILL™

5.1

Dosing principle

This section describes the steps to be taken in order to prepare the instrument for batch dosing. Once the instrument isconfigured properly, the CORI-FILL™ technology controls the dosing process, regardless of the fieldbus system the
instrument is installed in. The digital parameters can be monitored (or even controlled) in the usual way. To this end, eachconfiguration step is supplemented with a list of the digital parameters involved.

At the start of each batch, the flow is initiated by opening avalve (or starting a pump). The flow meter measures andtotalizes the flow, continuously calculating the current batch
size (Batch size = Flow x Time, see diagram). As soon as thedelivered batch size reaches the configured batch size, theflow is stopped.
Depending on the importance of accuracy as opposed todosing speed, proportional control or on/off control isadvised. Proportional control using a control valve or (gear)pump is the common method if batch size accuracy is of
critical importance. On/off control using a shut-off valve istypically used in situations where dosing speed is more
important.

5.1.1

Proportional control

With proportional control, each batch starts with a linear
phase, where dosing is done with the highest possible flowrate (flow setpoint = 100%). When the configured batch size
is being approached, the flow can be reduced, by graduallyclosing the valve (or reducing pump speed), until the flowrate reaches zero at the end of the batch (control gain
phase).
This proportional optimization method assures accurate
dosing from the very first batch, with minimal overshoot.
To compensate for possible dosing speed reduction by thecontrol gain phase, the controller response performance canbe enhanced somewhat, by optimizing the PID controller
characteristics of the instrument.

5.1.2

Preventing overshootDue to mechanical restrictions, the first dosage in theprocess will always have some overshoot (delivered batchlarger than configured size). This goes for both on/off
control and proportional control (even though the control
gain phase of the proportional batch cycle assures minimal
batch size overshoot).
CORI-FILL™ implements an overrun correction algorithm toprevent batch size overshoot. This automatic self-learning
function optimizes the size of each new batch, based on thepreviously delivered one, until the overshoot is eliminated(typically after 3 batches, assuming the inlet pressure isstable).

9.17.097N

Instruction Manual mini CORI-FLOW ML120

51

Bronkhorst®

5.1.3

Estimated dosing time

With proportional control, the estimated dosing time per batch can be calculated with the following formula:With on/off control, the estimated dosing time per batch can be calculated with the following formula:

Note that with on/off control, the only way to affect the dosing time is by changing the batch size, because the maximum
instrument flow rate cannot be changed. With proportional control, the measuring range of the instrument can berescaled.
The formulas above depict rough estimations of the expected dosing times. The extra time (2 seconds for proportional
control, 1 second for on/off control) is determined experimentally, based on observations made while setting up CORI-FILL
using FlowPlot.

5.2

Process conditions

When setting up the instrument for batch dosing, the following considerations are critical for obtaining accurate dosing
results:· Prior to starting batch dosing, adjusting the zero point of the instrument at actual process conditions is recommended(see Zeroing).

· The inlet pressure should be appropriate and stable. Too high a pressure will cause batch size overshoot, too low apressure will result in not reaching the configured batch size within an acceptable time frame.

· For liquid dosing, the liquid should not contain any gas bubbles. Gas bubbles act as an 'expansion vessel', destabilizing

the flow rate and slowing down response times. Using a degasser is recommended, especially with very small batch sizes
and/or times (in the order of mg/ml and ms respectively).
· The amount of piping, reducers, connections and T-parts should be limited to the absolute minimum.
· Tubing/piping size should be appropriate to the flow rate.

5.3

Parameter settings

Preparing the instrument for CORI-FILL™ batch dosing involves setting a number of parameters, in order to determine thedosing characteristics:
1. dosing method (volumetric flow or mass flow)
2. dosage settings (batch dimensions)3. optimizationa. overrun correction
b. disabling filtersc. proportional control optimization
This section concentrates on configuring the instrument using FlowDDE and FlowPlot. Guidelines given for setting
parameter values are based on best practice. For some parameters, the optimal value depends on a number of factors, suchas the instrument type, specific dosing requirements and operational circumstances.
For the most part, configuration can be done in the Instrument Settings function in FlowPlot. In order to enablecommunication between FlowPlot and the instrument, the Control Mode of the instrument has to be set to RS232
communication (see Special parameters).
Extensive information about the installation and usage of FlowPlot can be found in the FlowPlot manual (document
9.17.030), which can be downloaded from www.bronkhorst.com/downloads.
· If the 9-pin D-sub connector is set for RS-485 communication, the instrument will not respond to an RS-232 master. In

that case, use the multifunctional switch to enter configuration mode and enable RS-232 communication.

· After configuring the required parameters, follow the same procedure to leave configuration mode and restore theoriginal communication settings (otherwise, configuration mode will remain enabled after the next power-up).

52

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

5.3.1

Dosing method

With CORI-FILL™, batch dosing can be done based on mass
or volume flow. By choosing the required unit type, thebatch counter is automatically configured to use similar
units.
In FlowPlot, the fluid settings for determining the dosing
method are located on the Basic tab of the Instrument Settings
function (see image to the right).
For volume flow based dosing, the instrument needs thefluid density to calculate the volume and batch size from themass flow measured by the instrument. The instrument
supports different types of volume measurement.
Depending on the specific type selected, the actual(measured by the instrument) or theoretical fluid density is
used.
For liquid dosing, FlowPlot supports Mass Flow and Volume
Flow; for gas, Mass Flow, Normal Volume Flow or Standard
Volume Flow can be selected.

With Mass Flow, the instrument does not need extra
information to calculate the batch size:

When Volume Flow, Normal Volume Flow or Standard
Volume Flow is selected, the instrument needs thetheoretical fluid density to calculate the batch volume.
Because Normal Volume Flow and Standard Volume Flow
are typical gas flow units, for these unit types the fluid
density at normal (0 °C, 1 atm) or standard conditions (20 °C,
1 atm) respectively is needed.
With Actual Volume Flow, the actual fluid density, measured
by the instrument, is used to calculate the batch volume:

Because the mini CORI-FLOW ML120 measures mass flow, this is also the preferred dosing method. For volume based
capacity units, the fluid density is needed to calculate the batch size (see the descriptions below), which is less accurate (andslower) than using the measured mass flow directly.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

53

Bronkhorst®
The following digital parameters are involved in choosing the required dosing method:
Name

Process/
Parameter

ModbusValue
Register no

Purpose/Remarks

Capacity Unit (129)1/3133273…
33276

as required

select measuring unit
(see fluid set parameters for available measuring units)

Density (170)33/2141385…
41386

as required

fluid density used to calculate volume flow from mass flow:· for liquid dosing, use theoretical fluid density· for volume based gas dosing, use fluid density at normal (0 °C, 1atm) or standard conditions (20 °C, 1 atm)

5.3.2

Batch settings

When configuring the instrument for batch dosing, always set New setpoint on limit to 0. With any other value themedia flow will not stop after reaching the configured batch size. In that case, dosing can only be stopped by disabling thecounter (Counter Mode = Off) and changing the main setpoint to 0.

The counter function of the instrument is used to configure
the actual batch parameters. In FlowPlot, these settings aredone on the Alarm & Count tab of the Instrument Settings
function:
1. For batch dosing, set the counter to totalize the measured
flow rate, until the required batch size is reached (Up tolimit)
2. The counter limit defines the required batch size (note thatthe selectable counter units automatically match thecapacity unit type that was selected by choosing thedosing method)
3. By changing the new setpoint to 0 (zero) on reaching thecounter limit, the flow is stopped when the configured
batch size is delivered
4. A new batch can be started by resetting the counter bymeans of (one of) the configured batch trigger(s)When testing batch settings in FlowPlot, follow these steps:· Set the setpoint to 0% (group Setpoint controller, see image)· Click the Reset counter button· Start the first batch by changing the setpoint to 100%
· Wait until the configured counter limit is reached (redindicator in the bottom of the Counter group)· Click Reset counter to start a new batch

54

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
In the table below, the digital counter parameters are described from a batch dosing point of view. See counter parameters
for usage and supported values.
Name

Process/
Parameter

Modbusregister no

Value

Purpose/Remarks

Counter Unit (128)104/759448…
59449

as required

set dosing unit
unit must be from the same category as Capacity Unit

Counter Mode (130)

104/8

3337

2

count until configured batch size is reachedCounter Limit (124)104/359417…
59418

as required

set batch size

Counter Setpoint Mode
(126)

104/5

3334

1

change setpoint when configured batch size is reachedCounter New Setpoint
(127)

104/6

3335

0

stop flow after reaching batch size

Reset Counter Enable
(157)

104/9

3338

as required

enable new batch trigger(s)5.3.3Overrun correction

By setting Counter Controller Overrun Correction to a value
between 0 and 1, the system closes the valve (or stops thepump) a fraction before reaching the batch size, minimizing
overshoot.
In FlowPlot, the overrun correction can be set on the Alarm &Count tab of the Instrument Settings function.

An overrun correction value of 0.8 has proven to be a proper functional value. Higher values will result in faster correction(needing less dosing cycles to eliminate batch size overshoot), but might also result in unstable control behavior.
Overrun correction is set by the following digital parameter:
Name

Process/
Parameter

Counter Controller
104/10Overrun Correction (274)9.17.097N

Modbusregister no

Value

Purpose/Remarks

59473…
59474

0.8

prevent batch size overshoot· higher value: faster correction, less dosing cycles needed· lower value: slower correction, more dosing cycles needed

Instruction Manual mini CORI-FLOW ML120

55

Bronkhorst®

5.3.4

Disabling filters

Dosing speed can be increased by disabling output andsensor filters. In FlowPlot, filter settings are located on the
Basic tab of the Instrument Settings function. To disablefiltering, make sure to set the values as shown in the image
to the right.
Disabling filters, however, not only makes the instrument
faster, it also makes it more sensitive to vibrations andelectrical noise.

Minimizing sensitivity
The instrument should always be mounted in a vibration free environment (if possible), on the supplied mass block anddampers. Sensitivity to electrical noise can be eliminated by increasing the minimum capacity of the instrument to a value
just above the noise level.
The minimum capacity cannot be entered in FlowPlot; instead, use the parameter test function of FlowDDE. To read andwrite parameters with FlowDDE, proceed as follows:
1.
2.
3.
4.
5.

In FlowDDE, open FLOW-BUS > Test FLOW-BUS and DDE
From the Parameter list, select the required parameterIn the Write value column, enter the required parameter
Click the Write button to store the value
Click the Read button to check if the write action has succeeded

The value of Capacity Minimum (247) can only be changed after enabling edit mode for secured parameters with parameter
Init Reset (7). To set the minimum capacity, enter the required information as shown in the image below (the value ofCapacity Minimum is illustrative, use the value you need).

56

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
The following digital parameters are involved in the filtering and minimum capacity settings:
Name

Process/
Parameter

Modbusregister no

Value

Purpose/Remarks

Dynamic Display Factor
(56)

117/1

62729…
62730

1

disable filter

Static Display Factor (57)117/262737…
62738

1

disable filter

Sensor Exponential
Smoothing Filter (74)117/462753…
62754

1

disable filter

Capacity Minimum (247)1/2733241…
33242

as required

typical value (for mini CORI-FLOW ML120): 5 g/h

5.3.5

Proportional control settings

Adjusting flow range
A proportional control valve enables re-scaling of the controllable flow range, making it possible to dose with a lower flow.
This increases the running time of the batch (especially in the linear phase; see Dosing principle), but also provides higher
accuracy. To minimize batch size overshoot, the flow can be reduced further when nearing the configured batch size
(control gain phase).
To change the maximum capacity in FlowPlot, return to the
Basic tab of the Instrument Settings function and edit the Fullscale value. In the plotting area of the main screen, this value
is translated to 100%.

The starting point of the control gain phase is determined by the value of Counter control gain. From the start of thecontroller gain phase, the valve is closed gradually (or the pump speed lowered), until the configured batch size is reached.
The required value can be calculated with the following formula:

The table below shows some example values:

Percentage
delivered
0%
50%
75%
80%
90%
95%
98%
99%

Counter control gain
124510 (default)
20
50
100

p

longer dosing time,less overshootlshorter dosing time,
more overshootq

If the value is set to 0, control gain is disabled. Essentially, thisturns proportional control into on/off control.
In FlowPlot, the input location of Counter control gain can befound on the Alarm & Count tab of the Instrument Settings.

Lower values start the control gain phase earlier, which can lead to exceptionally long dosing times. A minimum value of
10 is recommended (corresponding to 90% of the batch delivered). If this leads to batch size overshoot, consider lowering
the maximum capacity (rather than lowering Counter control gain).

9.17.097N

Instruction Manual mini CORI-FLOW ML120

57

Bronkhorst®
The following digital parameters are involved in adjusting the flow progress during each batch:
Name

Process/
Parameter

Modbusregister no

Value

Purpose/Remarks

Capacity (21)1/1333129…
33130

as required· set maximum dosing flow
· analog output signal is re-scaled accordingly (20 mA corresponds

59481…
59482

as required

Counter Controller Gain(275)

104/11

to 100% FS)

prevent batch size overshoot by reducing flow when approaching
configured batch size

Optimizing controller
The PID controller settings of the instrument are optimized before shipping. Generally, changing these settings is strongly
dissuaded. However, for proportional batch dosing, adjusting some of the PID-parameters slightly might prove useful toimprove response performance and dosing accuracy.
In FlowPlot, the controller settings are located on the Controller
tab of the Instrument Settings.
1. A control valve (or pump) needs a minimum electricalcurrent (threshold) to open (or start running). Normally,
when opening the valve, the current is increased gradually,
until the threshold is reached and the valve opens. The
time to reach the threshold (dead time) can be minimized,by specifying a starting power/current, just under thethreshold. This shortens the valve response time, because
the starting power is immediately applied when the valve
is opened (instead of gradually).
2. Setpoint slope can be used to smooth 'nervous' behavior of
the PID controller (reduce setpoint overshoot orundershoot), but with proportional batch dosing, thismight lengthen the dosing time unacceptably. The
recommended value for Setpoint slope is 0.
3. Dosing speed can be increased, by optimizing the PID
settings of the controller. Be aware, however, that evensmall changes might result in violent reactions andunstable control behavior. The recommended values areshown in the image to the right and in the table below.
· The required power to open the valve can be determined automatically, by clicking the Learn open button. Note that

this only works by (temporarily) disabling the counter(Counter mode = Off; see Batch settings)· If necessary, the PID dials can be re-scaled by clicking on a scale value and entering a new value.

The following digital parameters are involved in optimizing proportional control:
Name

Process/
Parameter

Modbusregister no

Value

Purpose/Remarks

Valve Open (190)

114/2462145…
62146

as required

set minimum current/voltage required to open the valve

Setpoint Slope (10)

1/2

35

0

adjustment time when changing setpoint from 0% to 100% (range
corresponds with 0…3000 seconds)

PID-Kp (167)

114/2162121…
62122

10

controller proportional action(increase to speed up controller, decrease to slow down)

PID-Ti (168)

114/2262129…
62130

0.1

controller integral action(decrease to speed up controller, increase to slow down)

PID-Td (169)

114/2362137…
62138

0controller derivative action (prevents setpoint overshoot)58

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
For more information about the PID controller, see Digital parameters - Controller in this manual or the FlowPlot manual(document 9.17.030).

5.3.6

On/off control settings

Minimizing valve temperature
When working with fluids with a low boiling/evaporation point, it can be useful to limit the power dissipation by a shut-off
valve, in order to minimize the temperature rise caused by valve actuation. A shut-off valve needs a stronger signal to open
it than to keep it open (hold signal). Once it is open, the signal can safely be set to a lower point, reducing power
dissipation by the valve coil (thereby minimizing temperature rise).

On/off control without hold signal

On/off control with hold signal

In FlowPlot, the valve power parameters are set on theController tab of the Instrument Settings:· Valve maximum sets the power needed to fully open thevalve· Valve open sets the power needed to keep the valve open
(hold signal)
Optimum values might differ, depending on the specifics ofthe valve.

If the use of the valve power parameters seems somewhat counterintuitive, note that usage here is specific to shut-off
valves. For control valves, the purpose of the Open and Max parameters is more straightforward.
The valve power settings can be done with the following digital parameters:
Name

Process/
Parameter

Modbusregister no

Value

Purpose/Remarks

Valve Maximum (231)

114/2562153…
62154

as required

set minimum power for opening shut-off valve

Valve Open (190)

114/2462145…
62146

as required

set minimum power to keep the valve open

9.17.097N

Instruction Manual mini CORI-FLOW ML120

59

Bronkhorst®

5.4

Problem

Optimizing hints

Possible cause

ActionDosing time too short· Decrease inlet pressure· Decrease maximum capacity*

Counter control gain too highDecrease counter control gain*

Flow rate too low· Increase inlet pressure· Increase maximum capacity*

Counter control gain too low

Increase counter control gain*Controller too slow

Optimize PID controller*

Pump speed adjustment too slow

Increase controller speed (when using a pump,controller speed values up to 10 can be used)

New batch cannot be started

New batch trigger(s) not defined

Enable new batch trigger(s) (see Batch settings)

Flow continues after configured
batch size is reached

New setpoint on limit > 0%

Set New setpoint on limit to 0% (see Batch
settings)

Counter value still changes after
limit is reached

Measuring signal disturbed byelectrical noise

Increase minimum capacity (see Disabling
filters)

Zero point drifted

Adjust zero point (see Zeroing)

Gas inclusion in tubing

Flush instrument and tubing at relatively highflow rate before starting batch control

Leakage

Check system for leaks

New setpoint on limit > 0%

Set New setpoint on limit to 0% (see Batch
settings)

Flow signal too slow

Output filters enabled

Disable filters (see Disabling filters)· Delivered batch size inaccurate

Vibrations in instrument
surroundings· Avoid mounting in close proximity of

Zero point drifted

Adjust zero point (see Zeroing)

Gas inclusion in liquid

Install degasser

Inlet pressure unstable

Eliminate pressure fluctuations, e.g. byinstalling a pressure regulator

Filter settings not optimized

Disable filters (see Disabling filters)

Proportional dosing too fast

Decrease counter control gain (see Proportional
control settings)*

Controller settings not optimized

Set overrun correction to 0.8 (see Overrun
correction)

Inlet pressure too highDecrease inlet pressure

Liquid tubing resistance too low

Restrict flow e.g. with needle valve or by using
tubing with smaller diameter

Full scale capacity too low

Rescale controllable flow range (seeProportional control settings)*

Controller settings not optimized

Decrease PID-Kp value (see Proportional control
settings)*

Batch size overshoot not reduced
after more than 3 batches
Dosing time too long

and/or unstable· Delivered batch size does notmatch counter limit

Flow signal > 130%mechanical vibrations· Follow mounting instructions*) Proportional control only

60

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

6

Troubleshooting and service

See LED indications for an explanation of all possible LED indications.
In case of problems during operation, error and warning information can be found in FlowDDE and FlowPlot. FlowDDE
puts all errors and warnings on the console screen; FlowPlot provides several alarm and counter indicators. See also section
Basic RS232 operation.

6.1

Restoring factory settings

In case changes to the instrument configuration leads to non-recoverable erroneous behavior, the instrument can be resetto the pre-configured factory settings. This can be done with the following methods:· with the multifunctional switch (see Multifunctional switch)· with the restore function of a Bronkhorst® readout and control unit (BRIGHT, E-8000)· via RS232 communication, with the Restore settings function in FlowPlot

Changes made to the network settings (bus address, baud rate, parity) will not be restored by a factory reset.
If digital communication with the instrument can not be re-established, see Multifunctional switch to enter configurationmode, overrule the 9-pin D-sub communication settings and use the RS232 communication mode to re-establish
communication.

6.2

Symptom

Common issues

Red LED glows continuously

No fieldbus communication

No output signal· Control behavior unstable· Red LED flashes irregularly

9.17.097N

Possible cause

ActionNo liquid in measuring tube

Flush instrument with process fluid prior tostarting measurement and control

Slug flow (combined gas andliquid flow)

Make sure the measuring tube only contains
either gas or liquid

Hardware error

Return equipment to factory

No power supply· Check power supply· Check cable connection· Check cable hook-up

Invalid node address

Change node address (see Network
configuration)

Other

Reset instrument and/or restart master. Contact
Bronkhorst if problem persists.

No power supply· Check power supply· Check cable connection· Check cable hook-up

Inlet pressure or differential
pressure too low

Increase inlet pressure

Piping, filters and/or control valve
clogged or blocked· Clean system (flush with clean, dry air or a

Sensor failure

Return equipment to factory

Measurement disturbed bymechanical vibration· If possible, avoid installation in close

non-aggressive cleaning liquid (e.g. ethanol
or isopropyl alcohol)· For external proportional control valves:
supply 0…15 Vdc and operational inlet
pressure to valve and slowly increase
voltage. If valve does not open, clean partsand re-adjust valve

proximity of mechanical vibration

Instruction Manual mini CORI-FLOW ML120

61

Bronkhorst®
Symptom

Possible cause

Action· Reduce sensitivity to vibrations by using a

mass block, dampeners, and flexible tubing

Inlet pressure unstable

Eliminate pressure fluctuations, e.g. byinstalling a pressure regulator

Gas accumulation in tubing

Flush the system to remove gas
Tip: use frequency or density signal to detectpresence of gas bubbles

Wrong controller settings

Adjust settings (e.g. with FlowPlot)

No flow (sending a setpoint has no No fluid supply
effect)Flow rate rises, but never reaches
setpoint

Measured value or output signal
much lower than setpoint

Check upstream components for obstruction,e.g.:· fluid lines· valves· filters

Inlet pressure or differential
pressure out of bounds

Set inlet pressure to a value within
specifications

Piping, filters and/or control valve
clogged or blocked· Clean system (flush with clean, dry air or a

Inlet pressure too low

Increase inlet pressure

Outlet pressure too highCheck outlet pressure

Process outlet blocked

Check process outlet and downstream piping

Inlet pressure or differential
pressure too low· Increase inlet pressure· Use instrument in conditions it was designed

Piping or filters blocked orcontaminatedClean system

Sensor blocked or contaminatedClean sensor

Valve blocked or contaminatedClean valve

non-aggressive cleaning liquid (e.g. ethanol
or isopropyl alcohol)· For external proportional control valves:
supply 0…15 Vdc and operational inlet
pressure to valve and slowly increase
voltage. If valve does not open, clean partsand re-adjust valveforSupplied fluid type does not match Supply equipment with other fluid or change
configured fluid typefluid type in instrument configuration
Measured value or output signal
Instrument not mounted
indicates a flow, while there should horizontally or ambient conditions
be nonediffer significantly from conditions
stated on serial number label

Continuous maximum measured
value or output signal

62· Follow mounting instructions· Use instrument in conditions it was designedfor· Adjust zero point (see Zeroing)

Control valve leaking

Clean valve; if problem persists, return
equipment to factory

System leakage

Check the system for leakage. Follow vendor
instructions when installing third party
components (e.g. adapters, tubing, valves)

Inlet pressure too highCheck inlet pressure

Control valve (normally open)
failureReturn equipment to factory

Sensor failure

Return equipment to factory

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Symptom

Possible cause

ActionFlow rate decreases gradually

Condensation on measuring tube
(might occur with NH3 and somehydrocarbons, such as C3H8, C4H10)

Increase media temperature to above ambientconditions

9.17.097N

Instruction Manual mini CORI-FLOW ML120

63

Bronkhorst®

6.3

Service

For current information about Bronkhorst® and worldwide service addresses, please visit our website:www.bronkhorst.com

Do you have any questions about our products? Our Sales department will gladly assist you selecting the right product foryour application. Contact sales by e-mail:sales@bronkhorst.com

For after-sales questions, help and guidance, our Customer Care department is available by e-mail:aftersales@bronkhorst.com

No matter the time zone, our experts within the Customer Care department are available to answer your request
immediately or take appropriate further action. Our experts can be reached at:

+31 859 02 18 66

Bronkhorst High-Tech B.V.
Nijverheidsstraat 1A
NL-7261 AK Ruurlo
The Netherlands

64

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®

7

7.1

Returns

Removal and return instructions

When returning materials, always clearly describe the problem, and, if possible, the work to be done, in a covering letter.
Instrument handling:
1. Purge all fluid lines (if applicable)
2. If the instrument has been used with toxic or otherwise hazardous fluids, it must be cleaned before shipping
3. Disconnect all external cabling and tubing and remove the instrument from the process line
4. If applicable, secure movable parts with appropriate transport safety materials, to prevent damage duringtransportation
5. The instrument must be at ambient temperature before packaging
6. Insert the instrument into a plastic bag and seal the bag
7. Place the bag in an appropriate shipping container; if possible, use the original packaging box
Add documentation:· Reason of return· Failure symptoms· Contaminated condition· Declaration on decontamination
It is absolutely required to notify the factory if toxic or dangerous fluids have been in contact with the device!
This is to enable the factory to take sufficient precautionary measures to safeguard the staff in their repair department.
All instruments must be dispatched with a completely filled in 'Declaration on decontamination'. Instruments without thisdeclaration will not be accepted.
A safety information document containing a 'Declaration on decontamination' form (document no 9.17.032) can be
downloaded from the Service & Support section of the Bronkhorst website (www.bronkhorst.com).
Important:
Clearly note, on top of the package, the customs clearance number of Bronkhorst High-Tech B.V.:
NL801989978B01(only if applicable, otherwise contact your Bronkhorst representative for local arrangements.)

7.2

Disposal (end of lifetime)

If you are a customer within the European Union and wish to dispose of Bronkhorst® equipment bearing thesymbol of a crossed out waste disposal bin, you can return it in accordance with the removal and return
instructions. Bronkhorst will then take care of proper dismantling, recycling and/or reuse (wherever possible).
In the covering letter, mention that you are returning the product for disposal.
In countries outside the EU, disposal of electrical and electronic equipment (EEE) may be subject to local or
national directives and/or legislation. If applicable, consult local or national authorities to learn how tohandle EEE properly in your area.

9.17.097N

Instruction Manual mini CORI-FLOW ML120

65

Bronkhorst®

66

Instruction Manual mini CORI-FLOW ML120

9.17.097N

Bronkhorst®
Parameters - Master/Slave

Parameter index

Master Node
Slave Factor

Parameters

Parameters - Alarms

Parameters - Measurement and control

Alarm Delay Time

39

Alarm Maximum Limit

40

Alarm Info

Alarm Minimum Limit
Alarm Mode

Alarm New Setpoint

Alarm Setpoint Mode
Reset Alarm Enable

Parameters - Controller

39
40
39
40
40
40

Controller Speed

49

Open from zero response

50

Normal step response
PID-Kp
PID-TdPID-TiStable situation response

Parameters - Counter

50
50
50
50
50

Counter Limit

41

Counter New Setpoint

42

Counter Mode

Counter Setpoint Mode
Counter Unit

Counter Value

Reset Counter Enable

Parameters - Device identification

41
42
41
41
42

BHT Model Number

36

Device type

37

Customer Model

Firmware version

Identification number
Serial Number
User Tag

Parameters - Fluid set

Parameters - Fluid set (advanced)

Pressure

Sensor Type
Setpoint

Setpoint Slope
Temperature

Valve Output

Parameters - Network configuration

37
37
38
37
38
37
38

Fieldbus1 Address

43

Fieldbus1 Parity

43

Fieldbus1 Baud Rate
Fieldbus2 Address

Fieldbus2 Baud Rate
Fieldbus2 Parity

Parameters - Special

43
44
44
44

Control Mode45

IO Status

46

Init Reset
Reset
Wink

44
44
45

47
47
46

Inlet Pressure

48

9.17.097N

Measure

38

47

48

Outlet Pressure

37

Fsetpoint

37

36

Density

Fluid Temperature

FmeasureDensity Actual

36

47

Fluid Set Index

38

36

Capacity Unit Type Pressure
Fluid Name

Analog Input

36

47

Capacity Unit Type Temperature

49

36

Capacity 100%
Capacity Unit

48

48
48

Instruction Manual mini CORI-FLOW ML12067