KA01469P/00/EN/05.24-00
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2024-03-26

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Brief Operating Instructions
Cerabar PMC51B
Process pressure measurement
HART

These Brief Operating Instructions are not a
substitute for the Operating Instructions
pertaining to the device.
Detailed information can be found in the
Operating Instructions and the additional
documentation.
Available for all device versions via:
• Internet: www.endress.com/deviceviewer• Smartphone/tablet: Endress+Hauser
Operations app

Associated documentation

1

Cerabar PMC51B HART

Associated documentation

1.

Order code: XXXXX-XXXXXX
Ser. no.:XXXXXXXXXXXX
Ext. ord. cd.: XXX.XXXX.XX

Serial number

2. www.endress.com/deviceviewer

Endress+Hauser
Operations App

3.

A0023555

2

About this document

2.1

Document function

The Brief Operating Instructions contain all the essential information from incoming
acceptance to initial commissioning.

2.2

Symbols

2.2.1

Safety symbols

DANGER
2

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Cerabar PMC51B HART

About this document

This symbol alerts you to a dangerous situation. Failure to avoid this situation will result inserious or fatal injury.
WARNING

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result inserious or fatal injury.
CAUTION

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result inminor or medium injury.
NOTICE

This symbol contains information on procedures and other facts which do not result inpersonal injury.
2.2.2

Electrical symbols

Ground connection:
Terminal for connection to the grounding system.
2.2.3

Symbols for certain types of information

Permitted:
Procedures, processes or actions that are permitted.
Forbidden:
Procedures, processes or actions that are forbidden.
Additional information:
Reference to documentation:
Reference to page:
Series of steps: 1. , 2. , 3.
Result of an individual step:
2.2.4

Symbols in graphics

Item numbers: 1, 2, 3 ...
Series of steps: 1. , 2. , 3.
Views: A, B, C, ...
2.2.5

Symbols on the device

Safety instructions:Observe the safety instructions contained in the associated Operating Instructions.
Endress+Hauser

3

Basic safety instructions

2.2.6

Communication symbols

2.3

Registered trademarks

Cerabar PMC51B HART

HART®
Registered trademark of the FieldComm Group, Austin, Texas, USA
Bluetooth®
The Bluetooth® wordmark and logos are registered trademarks of Bluetooth SIG, Inc. and any
use of these trademarks by Endress+Hauser is licensed. Other trademarks and trade names
are those of their respective owners.
Apple®
Apple, the Apple logo, iPhone, and iPod touch are trademarks of Apple Inc., registered in the
U.S. and other countries. App Store is a service mark of Apple Inc.
Android®
Android, Google Play and the Google Play logo are trademarks of Google Inc.
KALREZ®
Registered trademark of DuPont Performance Elastomers L.L.C., Wilmington, USA

3

Basic safety instructions

3.1

Requirements for the personnel

The personnel for installation, commissioning, diagnostics and maintenance must fulfill thefollowing requirements:‣ Trained, qualified specialists must have a relevant qualification for this specific function
and task‣ Are authorized by the plant owner/operator‣ Are familiar with federal/national regulations‣ Before beginning work, the specialist staff must have read and understood the instructionsin the Operating Instructions and supplementary documentation as well as in thecertificates (depending on the application)‣ Follow instructions and comply with conditions
The operating personnel must fulfill the following requirements:‣ Being instructed and authorized according to the requirements of the task by the facility'sowner-operator‣ Following the instructions in these Operating Instructions

3.2

Intended use

The Cerabar is a pressure transmitter for measuring level and pressure.
3.2.1

Incorrect use

The manufacturer is not liable for damage caused by improper or non-intended use.
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Cerabar PMC51B HART

Basic safety instructions

Verification for borderline cases:‣ For special fluids and fluids for cleaning, Endress+Hauser is glad to provide assistance inverifying the corrosion resistance of fluid-wetted materials, but does not accept any
warranty or liability.

3.3

Workplace safety

When working on and with the device:‣ Wear the required personal protective equipment according to federal/national
regulations.
‣ Switch off the supply voltage before connecting the device.

3.4

Operational safety

Risk of injury!
‣ Operate the device only if it is in proper technical condition, free from errors and faults.
‣ The operator is responsible for the interference-free operation of the device.
Modifications to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers:‣ If, despite this, modifications are required, consult with Endress+Hauser.
RepairTo ensure continued operational safety and reliability:‣ Carry out repairs on the device only if they are expressly permitted.
‣ Observe federal/national regulations pertaining to the repair of an electrical device.
‣ Use original spare parts and accessories from Endress+Hauser only.
Hazardous area
To eliminate the risk of danger to persons or the facility when the device is used in theapproval-related area (e.g. explosion protection, pressure equipment safety):‣ Check the nameplate to verify if the device ordered can be put to its intended use in theapproval-related area.
‣ Observe the specifications in the separate supplementary documentation that is an integral
part of these Instructions.

3.5

Product safety

This device is designed in accordance with good engineering practice to meet state-of-the-art
safety requirements, has been tested, and left the factory in a condition in which it is safe tooperate.
It meets general safety standards and legal requirements. It also complies with the EC
directives listed in the device-specific EC Declaration of Conformity. Endress+Hauser confirms
this by affixing the CE mark to the device.

Endress+Hauser

5Incoming acceptance and product identification

3.6

Cerabar PMC51B HART

Functional Safety SIL (optional)

The Functional Safety Manual must be strictly observed for devices that are used in functionalsafety applications.

3.7

IT security

Endress+Hauser can only provide a warranty if the device is installed and used as described in
the Operating Instructions. The device is equipped with security mechanisms to protect itagainst any inadvertent changes to the device settings. IT security measures in line with
operators' security standards and designed to provide additional protection for the device anddevice data transfer must be implemented by the operators themselves.

3.8

Device-specific IT security

The device offers specific functions to support protective measures by the operator. These
functions can be configured by the user and guarantee greater in-operation safety if usedcorrectly. An overview of the most important functions is provided in the following section:• Write protection via hardware write protection switch• Access code to change user role (applies to operation via Bluetooth, FieldCare, DeviceCareand asset management tools (e.g. AMS, PDM)

4

Incoming acceptance and product identification

4.1

Incoming acceptance

DELIVERY NOTE

1=2

A0016870• Is the order code on the delivery note (1) identical to the order code on the product sticker(2)?
• Are the goods undamaged?
• Do the data on the nameplate correspond to the order specifications and the delivery note?
• Is the documentation available?
• If required (see nameplate): are the Safety Instructions (XA) provided?
If you can answer "no" to any of these questions, please contact Endress+Hauser.

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Cerabar PMC51B HART

4.2

Storage and transport

4.2.1

Storage conditions

Mounting• Use the original packaging• Store the device in clean and dry conditions and protect from damage caused by shocks
Storage temperature range
See Technical Information.
4.2.2

Transporting the product to the measuring point

LWARNING
Incorrect transport!
Housing and membrane may become damaged, and there is a risk of injury!
‣ Transport the device to the measuring point in the original packaging.

5

Mounting

5.1

Mounting requirements

5.1.1

General instructions• Do not clean or touch the membrane with hard and/or pointed objects.
• Do not remove the protection on the membrane until just before installation.
Always firmly tighten the housing cover and the cable entries.
1.

Counter-tighten the cable entries.

2.

Tighten the coupling nut.

5.1.2

Installation instructions• The devices are mounted according to the same guidelines as pressure gauges (DIN
EN837-2)• To ensure optimal readability of the local display, adjust the housing and local display• Endress+Hauser offers a mounting bracket to mount the device on pipes or walls• Use flushing rings for flanges if there is a risk of medium buildup or clogging at the processconnection• The flushing ring is clamped between the process connection and process• Material buildup in front of the membrane is flushed away, and the pressure chamber isvented, via the two lateral flushing holes• When measuring in media containing solids (e.g. dirty liquids), installing separators anddrain valves is useful for capturing and removing sediment

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7

Mounting

Cerabar PMC51B HART

• Using a valve manifold allows for easy commissioning, installation and maintenancewithout interrupting the process• When mounting the device, establishing the electrical connection and during operation:
prevent the penetration of moisture into the housing• Point the cable and plug downwards as much as possible to prevent moisture from entering(e.g. rainwater or condensation)
5.1.3

Installation instructions for thread• Device with G 1 ½" thread:Place the flat seal on the sealing surface of the process connection
Avoid additional strain on the membrane: do not seal the thread with hemp or similarmaterials• Device with NPT thread:• Wrap Teflon tape around the thread to seal it• Tighten the device at the hexagon bolt only; do not turn it by the housing• When screwing in, do not overtighten the thread; tighten the NPT thread to the required
depth according to the standard• For the following process connections, a tightening torque of max. 40 Nm (29.50 lbf ft) is
specified:• Thread ISO228 G ½" with flush membrane• Thread DIN13 M20 x 1.5 with flush membrane• NPT 3/4" with flush membrane
Mounting devices with PVDF thread

LWARNING
Risk of damage to process connection!
Risk of injury!
‣ Devices with a PVDF thread must be installed with the mounting bracket provided!
‣ PVDF is only intended for metal-free applications!
LWARNING
Material fatigue from pressure and temperature!
Risk of injury if parts burst! The thread can become loose if exposed to high pressure andtemperature loads.
‣ Check the leak-tight integrity of the thread regularly.
‣ Use Teflon tape to seal the ½" NPT thread.
5.1.4

Orientation

NOTICE
Damage to the device!
If a heated device is cooled during a cleaning process (e.g. by cold water), a vacuum develops
for a short time. As a result of this, moisture can enter the measuring cell via the pressurecompensation element (1).
‣ Mount the device as follows.

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Cerabar PMC51B HART

Mounting

1

1

1

1
A0038723• Keep the pressure compensation element (1) free from contamination• A position-dependent zero point shift (when the vessel is empty the measured value does
not display zero) can be corrected• The use of shutoff devices and/or water pocket pipes is recommended for mounting• The orientation depends on the measuring application

5.2

Mounting the device

5.2.1

Pressure measurement in gases

Mount the device with the shutoff device above the tapping point so that any condensate canflow into the process.
5.2.2

Pressure measurement in steam

Observe the maximum permitted ambient temperature of the transmitter!
Mounting:• Ideally, mount the device with the O-shaped siphon below the tapping point
The device may also be mounted above the tapping point• Fill the siphon with liquid before commissioning
Advantages of using siphons:• Protects the measuring device from hot, pressurized media due to the formation andcollection of condensate• Attenuation of water hammer• The defined water column only causes minimal (negligible) measured errors and minimal(negligible) thermal effects on the device
For technical data (e.g. materials, dimensions or order numbers), see the accessory
document SD01553P.
5.2.3

Pressure measurement in liquids

Mount the device with the shutoff device below or at the same level as the tapping point.

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9Electrical connection

5.2.4

Cerabar PMC51B HART

Level measurement• Always mount the device below the lowest measuring point• Do not install the device at the following positions:• In the filling curtain• In the tank outlet• In the suction area of a pump
• At a point in the tank which could be affected by pressure pulses from the agitator• Mount the device downstream from a shutoff device: the calibration and function check can
be carried out more easily
5.2.5

Closing the housing covers

NOTICE
Thread and housing cover damaged from dirt and fouling!
‣ Remove dirt (e.g. sand.) on the thread of the cover and housing.
‣ If you continue to encounter resistance when closing the cover, check the thread again forfouling.
Housing thread
The threads of the electronics and connection compartment can be coated with an antifriction coating.
The following applies for all housing materials:
Do not lubricate the housing threads.

6

Electrical connection

6.1

Connecting requirements

6.1.1

Potential equalization

The protective ground on the device must not be connected. If necessary, the potential
matching line can be connected to the outer ground terminal of the device before the device isconnected.

1A0045411

1

10Ground terminal for connecting the potential matching line

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Cerabar PMC51B HART

Electrical connection

LWARNING
Explosion Hazard!
‣ Please refer to the separate documentation on applications in hazardous areas for thesafety instructions.
For optimum electromagnetic compatibility:• Keep the potential matching line as short as possible• Maintain a cross-section of at least 2.5 mm2 (14 AWG)

6.2

Connecting the device
1

A00438061

Connection compartment cover

Housing thread
The threads of the electronics and connection compartment can be coated with an antifriction coating.
The following applies for all housing materials:
Do not lubricate the housing threads.
6.2.1

Supply voltage• Ex d, Ex e, non-Ex: supply voltage: 10.5 to 35 VDC• Ex i: supply voltage: 10.5 to 30 VDC• Nominal current: 4 to 20 mA HART
The power unit must be safety-approved (e.g. PELV, SELV, Class 2) and must comply
with the relevant protocol specifications. For 4 to 20 mA, the same requirements apply
as for HART.
6.2.2

Terminals• Supply voltage and internal ground terminal: 0.5 to 2.5 mm2 (20 to 14 AWG)
• External ground terminal: 0.5 to 4 mm2 (20 to 12 AWG)
6.2.3

Cable specification• Protective ground or grounding of the cable shield: rated cross-section > 1 mm2 (17 AWG)
Rated cross-section of 0.5 mm2 (20 AWG) to 2.5 mm2 (13 AWG)
• Cable outer diameter: Ø5 to 12 mm (0.2 to 0.47 in) depends on the cable gland used (seeTechnical Information)

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11Electrical connection

6.2.4

Cerabar PMC51B HART

4-20 mA HART
1

2
3
Y
I

+

+

-

mA
4
A0028908

1
1
2
3
4

Block diagram of HART connection
Device with HART communication
HART communication resistor
Power supply
multimeter

The HART communication resistor of 250 Ω in the signal line is always necessary in thecase of a low-impedance power supply.
Take the voltage drop into consideration:
Maximum 6 V for a communication resistor of 250 Ω
6.2.5

Overvoltage protection

Devices without optional overvoltage protection
Equipment from Endress+Hauser fulfills the requirements of the product standard IEC / DIN
EN 61326-1 (Table 2 Industrial Environment).
Depending on the type of port (DC power supply, input/output port) different testing levels
according to IEC / DIN EN 61326-1 against transient overvoltages (Surge) are applied (IEC /DIN EN 61000-4-5 Surge):
Test level on DC power ports and input / output ports is 1000 V line to earth
Overvoltage category
Overvoltage category II

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Cerabar PMC51B HART

6.2.6

Electrical connection

Wiring

LWARNING
Supply voltage might be connected!
Risk of electric shock and/or explosion!
‣ If the device is used in hazardous areas, comply with national standards and thespecifications in the Safety Instructions (XAs). Use the specified cable gland.
‣ The supply voltage must match the specifications on the nameplate.
‣ Switch off the supply voltage before connecting the device.
‣ If necessary, the potential matching line can be connected to the outer ground terminal of
the transmitter before the device is connected.
‣ A suitable circuit breaker should be provided for the device in accordance with IEC/EN
61010.
‣ The cables must be adequately insulated, with due consideration given to the supply
voltage and the overvoltage category.
‣ The connecting cables must offer adequate temperature stability, with due consideration
given to the ambient temperature.
‣ Only operate the device with the covers closed.
‣ Protective circuits against reverse polarity, HF influences and overvoltage peaks areintegrated.
Connect the device in the following order:
1.

Release the cover lock (if provided).

2.

Unscrew the cover.

3.

Guide the cables into the cable glands or cable entries.

4.

Connect the cables.

5.

Tighten the cable glands or cable entries so that they are leak-tight. Counter-tighten the
housing entry. Use a suitable tool with width across flats AF24/25 8 Nm (5.9 lbf ft) for
the M20 cable gland.

6.

Screw the cover securely back onto the connection compartment.

7.

If fitted: tighten the screw of the cover lock using the Allen key 0.7 Nm (0.52 lbf ft)±0.2 Nm (0.15 lbf ft).

Endress+Hauser

13Electrical connection

6.2.7

Cerabar PMC51B HART

Terminal assignment

Single compartment housing

3
2

-

1

+

A0042594

2
1
2
3

14

Connection terminals and ground terminal in the connection compartment
Positive terminal
Negative terminalInternal ground terminal

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Cerabar PMC51B HART

Electrical connection

Dual compartment housing

- +

3

2 1
A0042803

3123Connection terminals and ground terminal in the connection compartment
Positive terminal
Negative terminalInternal ground terminal

6.2.8

Cable entries

1

2

A0045413

1
2

Cable entry
Dummy plug

The type of cable entry depends on the device version ordered.
Always route connecting cables downwards so that moisture cannot penetrate theconnection compartment.
If necessary, create a drip loop or use a weather protection cover.

Endress+Hauser

15Electrical connection

6.2.9

Cerabar PMC51B HART

Available device plugs

In the case of devices with a plug, it is not necessary to open the housing for connection
purposes.
Use the enclosed seals to prevent the penetration of moisture into the device.
Devices with valve plug
A

B

–

+

2 1

– 1

2 +

BU BN GNYE

3

– +A0023097

4

BN = brown, BU = blue, GNYE = green/yellow

A
B

Electrical connection for devices with valve connector
View of the plug-in connection on the device

Devices with a Harting plug Han7D
A

B

–

+

8

+ –

7 6
1

2

5
3

4

Han7D
+ –
A0041011

A
B

+
16

Electrical connection for devices with Harting plug Han7D
View of the plug-in connection on the device
Brown
Green/yellow
Blue
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Cerabar PMC51B HART

6.3

Ensuring the degree of protection

6.3.1

Cable entries

Electrical connection• Gland M20, plastic, IP66/68 TYPE 4X/6P• Gland M20, brass nickel plated, IP66/68 TYPE 4X/6P• Gland M20, 316L, IP66/68 TYPE 4X/6P• Thread M20, IP66/68 TYPE 4X/6P• Thread G1/2, IP66/68 TYPE 4X/6P
If the G1/2 thread is selected, the device is delivered with an M20 thread as standard and a
G1/2 adapter is included with the delivery, along with the corresponding documentation• Thread NPT1/2, IP66/68 TYPE 4X/6P• Dummy plug transport protection: IP22, TYPE 2• *Cable 5 m, IP66/68 TYPE 4X/6P pressure compensation via cable• *Valve plug ISO4400 M16, IP65 TYPE 4X• HAN7D plug, 90 degrees, IP65 NEMA Type 4X• M12 plug
When housing is closed and connecting cable is plugged in: IP66/67, NEMA Type 4X
When housing is open or connecting cable is not plugged in: IP20, NEMA Type 1
NOTICEM12 plug and HAN7D plug: incorrect mounting can invalidate the IP protection class!
‣ The degree of protection only applies if the connecting cable used is plugged in andscrewed tight.
‣ The degree of protection only applies if the connecting cable used is specified according toIP67, NEMA Type 4X.
‣ The IP protection classes are only maintained if the dummy cap is used or the cable isconnected.

Endress+Hauser

17

Operation options

Cerabar PMC51B HART

7

Operation options

7.1

Operating keys and DIP switches on the electronic insert
1
Zero/I

off onSW MaxAlarm

Display2
Span/II

43
A00392851
2
3
4Operating key for lower range value (Zero)
Operating key for upper range value (Span)
DIP switch for alarm current
DIP switch for locking and unlocking the device

The setting of the DIP switches has priority over the settings made via other operation
methods (e.g. FieldCare/DeviceCare).

7.2

Access to the operating menu via the local display

7.2.1

Device display (optional)

Functions:
Display of measured values and fault and notice messages
The device displays are available with the additional option of Bluetooth® wirelesstechnology.
Depending on the supply voltage and the current consumption, Bluetooth can optionallybe switched on or off.

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Cerabar PMC51B HART

Commissioning

4 5 6

7

1
2
3

A0043599

5
1
2
3
4
5
6
7

Segment display
Measured value (up to 5 digits)
Bar graph proportional to the current output
Unit of measured value
Locked (symbol appears when the device is locked)
Bluetooth (symbol flashes if Bluetooth connection is active)
HART communication (symbol is displayed if HART communication is active)
Measured value output in %8

Commissioning

8.1

Preliminaries

The measuring range and the unit in which the measured value is transmitted correspond to
the data on the nameplate.

LWARNING
The settings of the current output are relevant for safety!
This situation can result in product overflow.
‣ The setting of the current output depends on the setting in the Assign PV parameter.
‣ After changing the Assign PV parameter, check the settings for the range (LRV and URV)
and reconfigure them if necessary.
LWARNING
Process pressure above or below permitted maximum/minimum!
Risk of injury if parts burst! Warnings are displayed if the pressure is too high.
‣ If a pressure smaller than the minimum permitted pressure or greater than the maximum
permitted pressure is present at the device, a message is output.
‣ Only use the device within the measuring range limits!
8.1.1

As-delivered state

If no customized settings were ordered:
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19Commissioning

Cerabar PMC51B HART

• Assign PV parameter Pressure option• Calibration values defined by defined measuring cell nominal value• The alarm current is set to min. (3.6 mA), (only if no other option was selected whenordering)• DIP switch to Off position• If Bluetooth is ordered, then Bluetooth is switched on

8.2

Function check

Perform a function check before putting the measuring point into operation:• "Post-installation check" checklist (see the "Installation" section)• "Post-connection check" checklist (see the "Electrical connection" section)

8.3

Switching on the device
All configuration tools offer a commissioning wizard that helps the user to configure themost important configuration parameters (Guidance menu Commissioning wizard).

8.4

Setting the operating language

8.4.1

Operating tool

See the description of the operating tool.

8.5

Configuring the measuring device

8.5.1

Commissioning with keys on the electronic insert

The following functions are possible via the keys on the electronic insert:• Position adjustment (zero point correction)
The orientation of the device may cause a pressure shift
This pressure shift can be corrected by a position adjustment• Setting the lower range value and upper range value
The pressure applied must be within the nominal pressure limits of the sensor (see thespecifications on the nameplate)• Resetting the device
Carrying out position adjustment1.

Device installed in desired position and no pressure applied.

2.

Press the "Zero" and "Span" keys simultaneously for at least 3 s.

3.

When the LED lights up briefly, the pressure present has been accepted for position
adjustment.

Setting the lower range value (pressure or scaled variable)
1.

The desired pressure for the lower range value is present at the device.

2.

Press the "Zero" key for at least 3 s.

20

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Cerabar PMC51B HART

3.

Commissioning

When the LED lights up briefly, the pressure present has been accepted for the lower
range value.

Setting the upper range value (pressure or scaled variable)
1.

The desired pressure for the upper range value is present at the device.

2.

Press the "Span" key for at least 3 s.

3.

When the LED lights up briefly, the pressure present has been accepted for the upper
range value.

4.

Does the LED on the electronic insert not light up?
 Applied pressure for upper range value has not been accepted.
Wet calibration is not possible if the Scaled variable option has been selected in
the Assign PV parameter and the Table option has been selected in the Scaled
variable transfer function parameter.

Checking the settings (pressure or scaled variable)
1.

Press the "Zero" key briefly (approx. 1 second) in order to display the lower range value.

2.

Press the "Span" key briefly (approx. 1 second) in order to display the upper range value.

3.

Briefly press the "Zero" and "Span" keys simultaneously (approx. 1 second) in order todisplay the position offset.

Resetting the device‣ Press and hold the "Zero" and "Span" keys simultaneously for at least 12 seconds.
8.5.2

Commissioning with the commissioning wizard

In FieldCare, DeviceCare 1), SmartBlue and on the display, the Commissioning wizard isavailable to guide the user through the initial commissioning steps. Commissioning is also
possible via AMS or PDM.
1.

Connect the device with FieldCare or DeviceCare.

2.

Open the device in FieldCare or DeviceCare.
 The dashboard (homepage) of the device is displayed:

3.

In the Guidance menu, click the Commissioning wizard to open the wizard.

4.

Enter the appropriate value in each parameter or select the appropriate option. These
values are written directly to the device.

5.

Click "Next" to go to the next page.

1)

DeviceCare is available for download at www.software-products.endress.com. You must register in the Endress+Hauser software portal to download the product.

Endress+Hauser

21Commissioning

6.

Cerabar PMC51B HART

Once all the pages have been completed, click "End" to close the Commissioning wizard.
If the Commissioning wizard is cancelled before all the necessary parameters have been
configured, the device may be in an undefined state. In such situations, it is advisable toreset the device to the factory default settings.

Example: Outputting of the pressure value at the current output
Pressure and temperature units are converted automatically. Other units are notconverted.
In the following example, the pressure value should be measured in a tank and output on thecurrent output. The maximum pressure of 450 mbar (6.75 psi) corresponds to the 20 mA
current. The 4 mA current corresponds to a pressure of 50 mbar (0.75 psi).
Prerequisites:• Measured variable in direct proportion to the pressure• Due to the orientation of the device, there may be pressure shifts in the measured value(when the vessel is empty or partly filled, the measured value is not zero)
Perform a position adjustment if necessary• In the Assign PV parameter, the Pressure option must be selected (factory setting)
Display: In the Guidance menu Commissioning wizard, keep pressing the  key until you
reach the Assign PV parameter. Press the  key to confirm, select the Pressure option andpress  to confirm.

I
[mA]
20

4

50

B
450 mbar
20 mA

450

p
[mbar]

A
50 mbar
4 mA

A0039009

A
B

Lower range value output
Upper range value output

Adjustment:1.

22Enter the pressure value for the 4 mA current via the Lower range value output
parameter (50 mbar (0.75 psi)).

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Cerabar PMC51B HART

2.

Commissioning

Enter the pressure value for the 20 mA current via the Upper range value output
parameter (450 mbar (6.75 psi))

Result: The measuring range is set to 4 to 20 mA.
8.5.3

Commissioning without the commissioning wizard

Example: Commissioning a volume measurement in the tankPressure and temperature units are converted automatically. Other units are notconverted.
In the following example, the volume in a tank should be measured in liters. The maximum
volume of 1 000 l (264 gal) corresponds to a pressure of 450 mbar (6.75 psi).
The minimum volume of 0 liters corresponds to a pressure of 50 mbar (0.75 psi).
Prerequisites:• Measured variable in direct proportion to the pressure• Due to the orientation of the device, there may be pressure shifts in the measured value(when the vessel is empty or partly filled, the measured value is not zero)
Perform position adjustment if necessary

V
[l]
1000

0

50

B
450 mbar
1000 l450p[mbar]

A
50 mbar
0l

A0039010

A
B"Pressure value 1" parameter and "Scaled variable value 1" parameter"Pressure value 2" parameter and "Scaled variable value 2" parameter

The pressure present is displayed in the operating tool on the same settings page in the"Pressure" field.
1.

Enter the pressure value for the lower calibration point via the Pressure value 1
parameter: 50 mbar (0.75 psi)
 Menu path: Application → Sensor → Scaled variable → Pressure value 1

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23Commissioning

Cerabar PMC51B HART

2.

Enter the volume value for the lower calibration point via the Scaled variable value 1
parameter: 0 l (0 gal)
 Menu path: Application → Sensor → Scaled variable → Scaled variable value 1

3.

Enter the pressure value for the upper calibration point via the Pressure value 2
parameter: 450 mbar (6.75 psi)
 Menu path: Application → Sensor → Scaled variable → Pressure value 2

4.

Enter the volume value for the upper calibration point via the Scaled variable value 2
parameter: 1 000 l (264 gal)
 Menu path: Application → Sensor → Scaled variable → Scaled variable value 2

Result: The measuring range is set for 0 to 1 000 l (0 to 264 gal). Only the Scaled variablevalue 1 parameter and Scaled variable value 2 parameter are set with this setting. Thissetting has no effect on the current output.

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