2024018

AS-W(C)- 01

Ultrasonic Flow Meter for
Natural Gas and Factory Air
AS-W, AS-C (Ver. 5)[Overseas Standard Specifications]
Instruction Manual

Aichi Tokei Denki Co., Ltd.

Ultrasonic Flow Meter for Natural Gas and Factory Air AS-W, AS-C
[Overseas Standard Specifications] Instruction Manual
Table of Contents
Important Notes & Requests
Product Overview
Product Model
Important Notice ······································································ 3
For Safe and Proper Use ·························································· 3
1. Introduction ············································································ 6
1-1. Checking the Contents of the Package
1-2. Part Names
1-3. Steps to Start Operation
2. Activation ··············································································· 8
3. Configuration ·········································································· 93-1. Standard Factory Defaults
3-2. Configuration Change Procedure
3-3. Details of Configuration Items
4. Installation ············································································· 18
5. Wiring ··················································································· 23
6. Operation ·············································································· 24
7. Operation Description of the Display Section ····························· 24
8. Error Display and Output ························································· 27
9. Specifications ········································································ 29
10. External View ········································································ 32
11. Battery Life ··········································································· 32
12. Troubleshooting ···································································· 33- Warranty and After-Sales Service ··············································· Back-cover

Important Notes & Requests
Thank you very much for purchasing our ultrasonic flow meter for natural gas and factory air AS-W and
AS-C. Before using this product, be sure to read this instruction manual to ensure safe and proper use.
This manual is also required for maintenance. Please keep the manual in a safe place until this productis disposed of.

1

Product Overview
This flow meter is an ultrasonic flow meter for natural gas or factory air, and can measure the flow rateof natural gas and air in the following range. Installation on piping is done with a flange.
- Atmospheric pressure to 0.5 MPa abs or lessTarget Nominal Diameter: 25A, 32A- Atmospheric pressure to less than 1 MPa abs

Target Nominal Diameter: 40A to 200A

Product Model
Product models are classified according to specifications, nominal diameter and pressure sensor
specifications as follows.
AS [Specification] - [Nominal Diameter] - [Pressure Sensor Specification] BA/5
[Specification]
Natural Gas Specification: -W
Air Specification: -C[Nominal Diameter]
25A:

25

32A:

32

40A:

40

50A:

50

80A:

80

100A:

100

150A:

150

200A:

200

[Pressure Sensor Specification]
No pressure sensor: 0 (For all nominal diameters)

With 0.2 MPa pressure sensor: 200 (For all nominal diameters)

With 0.5 MPa pressure sensor: 500 (For all nominal diameters)

With 1.0 MPa pressure sensor: 1000 (For 40A to 200A)*1 25A and 32A are AS-W only.
*2 AS-C is 40A to 200A only.
B: Built-in battery model
A: Absolute pressure sensor
5: Version

2

Important Notice
To ensure safe use of this product and to avoid malfunctions or unexpected
situations, this manual uses the following symbols to indicate precautions.
Symbols in the Manual

DangerWarning

CautionThis symbol indicates that death or serious injury will result if the information is
ignored and the product is handled incorrectly.
This symbol indicates that death or serious injury is likely if the information is
ignored and the product is handled incorrectly.
This symbol indicates that if the information is ignored and the product is handledincorrectly, personal injury or property damage (e.g., product failure) may result.
This symbol indicates that mishandling may result in an accident.
This symbol indicates an inhibited operation or action.
This symbol indicates what you must follow.

For Safe and Proper UsePrecautions for Use
1. Do not use the flow meter in applications requiring safety such as nuclear
power, railways, aviation, vehicles, and recreational equipment.
2. Do not modify the flow meter.
3. The flow meter is not designed for sanitary use and should not be used forDangerfood, beverage, or medical applications.

3Operating Environment and Measurable Fluids
1. Do not flow any gas other than natural gas or air through this flow meter.
2. Observe the temperature and humidity ranges (-20 to +40°C, 90%RH orlower) and the pressure range.
3. Do not use in an atmosphere containing corrosive gases (chlorine, hydrogensulfide, etc.) or apply to fluids containing corrosive gases.
4. This flow meter is not fully waterproof (IP65). Do not install the flow meter
where it may be submerged in water.
5. Install the flow meter as far away from an electric noise source as possible.
If it is installed near the electric noise source, ground the shield of theexternal connection cable.
6. When the flow meter is installed in a location exposed to direct sunlight, it isrecommended to install a sunshade.
7. Ultrasonic measurement may not be possible due to the relationshipbetween methane concentration and working pressure value. Observe the
Cautionfollowing working pressure conditions for methane concentration.

Diameter

MethaneConcentration
Range
99 to 100%

Working
Pressure(absolute)
250 kPa or more

200A

97 to 99% or less

150 kPa or more

97% or less

No restrictions

98 to 100%

100 kPa or more *No restriction for
the 100A or lower
No restrictions
models.

Nominal150A

98% or less

Operational Precautions
1. Do not use this flow meter as a scaffold or do not get on it.
2. Do not hold the display section of this flow meter.
This flow meter is a precision measuring instrument, so please hold the partshown below.

○ Correct○ Correct

Warning

× Incorrect × Incorrect × Incorrect

Caution

3. Do not press down on the glass part.
1. When opening and closing the valve, do not operate the valve at once.
Open and close it slowly.
Rapid opening and closing of the valve when there is a pressure difference
between the upstream and downstream sides of the valve can cause the flow
meter to fail.
4

Storage

Caution

1. Keep away from fire and direct sunlight.
2. Do not place combustible materials, flammable substances, or heating
elements around the flow meter.
3. Store the flow meter in a place where the ambient temperature is -25 to+70°C and there is no condensation.

PipingCaution

1. Install flow regulating valves or other flow-disturbing devices downstream of
the flow meter.
2. If the piping is new, clean the piping thoroughly before installation.
3. Vertical piping is recommended if there is a lot of mist or dust. In the case ofhorizontal piping, install the flow meter so that the display section is facing
upward.
4. Do not install the flow meter where it will be subjected to strong compressiveor tensile forces or other loads after installation.
5. Install pipes in accordance with the flow direction indicated on the flow
meter.
6. Do not drop, strike, or subject the flow meter to excessive shock.
7. When rotating the display section, do not apply any force other than the
direction of rotation.
8. Do not touch the ultrasonic sensors.

WiringDangerCaution

1. When wiring, follow the instructions in this manual.
2. Observe the rated range.
Do not use the flow meter at voltages
exceeding the allowable load.
1. Do not wire the product together with power or motor cables.
2. Do not apply excessive tensile force to the external connection cable.
3. Make sure that the tip of the external connection cable is not submerged inwater during wiring work.
4. Be careful not to short-circuit when connecting the power line of the external
connection cable to an external power supply. Use an external power supply
with short-circuit protection.
5. Be sure to stop the external power supply before wiring.
6. Do not perform operation and the wiring work with wet hands.

Disassembly and Inspection
1. Do not disassemble the flow meter.
2. When fluid flow is normal, the pilot lamp will blink. If it does not blink, pleasecontact us.
3. When a lot of mist and dust is contained in the fluid, periodically remove theflow meter to check for dust or other debris and remove it as necessary.
Remove the flow meter from the piping, cover one side, and clean it with water
Cautionor spindle oil. (See "ALARM1 turns on" in "After Operation" in "12.
Troubleshooting" for details.)
Do not touch the ultrasonic sensors during inspection.
Disposal

Warning

1. This flow meter contains a built-in lithium thionyl chloride battery. Neverdispose of this flow meter in the general disposal route.
2. Be sure not to put the flow meter into fire. It may cause fire and/or explosion.

5

1. Introduction
1-1. Checking the Contents of the Package
When you receive our company product, please check that the following items are included in the
package.
Name

Qty.

Ultrasonic flow meter

1

Centering collar

2

M4 hexagonal wrench

1

Instruction Manual(this book)Remarks

See page 21 for details on how to use.
Used to tighten the set screw to change the orientation of thedisplay section and push the rear center button (SW3).

1

M4 hexagonal wrenchInstruction Manual(this book)

Centering collar

1-2. Part Names

Display section caseConfiguration button
Back side of thedisplay section case
Display section

Warning label
Body casing

Specification plate
Upper four digits of Ser. No.
indicate the date of
manufacture.

External output harness

Set screw

Ultrasonic sensor

6Rear view
Rear right button [SW2]Rear left button [SW1]Rear left button [SW1]Rear center button [SW3]Rear right button [SW2]

Pilot lamp

Main display section (upper)
For 200A

Sub-display section (lower)

Fig. 1-1. Part Names of Operation and Display Sections

1-3. Steps to Start Operation
The basic steps to start operation are as follows.
Flow meter configuration can be done after installation, but should be done before installation as
output may be unstable for a few seconds immediately after configuration changes.

Activation(Configuration)

Installation

WiringOperation

The startup procedure is described in "2. Activation."
Connect the battery to the circuit board of this flow meter and start it.

This flow meter can be set for measurement, output, and communication.
Normally, this flow meter has "standard factory settings" at the time of purchaseand can be used as is.
Refer to "3. Configuration" when customizing configuration depending on thecustomer's operation status.
Recommended conditions and precautions for piping are described in "4.
Installation."
Please be sure to read this section, as it may not be possible to measure correctly
depending on the piping conditions.
The connection with the RS485 power supply and receiving instruments andprecautions are described in "5. Wiring."
Be sure to read this section to use the flow meter correctly.
Precautions at the start of operation are described in "6. Operation."72. Activation(1) Use a Phillips screwdriver to remove the screws and open the lid.
(2) Place the supplied battery in the case on the right side of the board. At this time, insert the battery
with the side with the cable coming out down as shown below. (The battery may already beinstalled.)(3) Peel off the temporary fixing tape that secures the cable.
(4) Connect the connector to the board so that the black cable is up and the red cable is down. Be
sure to insert the connector all the way to the back.
*Immediately after startup, the LCD blinks. Please wait until the display switches to the lit display.
4 places

Put the battery in the case.
(May already be in)(1) Remove the screws.

(Connector
insertion port)(2) Put the battery in the case.

Temporary fixing tapeInsertBlack cable
Red cable

After insertion(3) Peel off the temporary fixing tape.

(4) Connect the connector to the board.

*1 Static electricity applied to the board may cause product failure. We recommend that you wear
anti-static gloves when working.
*2 After installing the battery, securely attach the gasket and close the lid. The screws should betightened diagonally with even torque. (Recommended torque: 1.0 [N·m])

8

3. Configuration
3-1. Standard Factory Defaults
This flow meter allows various settings related to measurement, output, and communication. (Table
3-1)
This flow meter has factory settings at the time of purchase and can be used as is.
To change the factory settings, follow the procedure in "3-2. Configuration Change Procedure."
Table 3-1. Configuration Items and Standard Factory Settings
Category 1
Category 2
Item
Item
Item
Item
No.
No.
F0
Softwareversion
F1
Measurement F1-1 Flowmeasurement
relatedCategory 3--

Maintenance--

Maintenance

Act: Forward actual accumulated
value
Std: Forward converted
accumulated value-

1 to 16 [times]

4-10.0 to +60.0 [°C]0.00.00 to 10.00 [kPa]0.00

Instantaneous flow
moving average times
Conversion reference
temperature
Conversion reference
pressure

F1-3

Pressuremeasurement
relatedFactory default settings-

Selection of displayed
accumulated flow rate

F1-2

Scope of configuration

Item

Enable/Disable supply
gas pressure setting

OFF: Disabled
ON: Enabled

Supply gas pressure

0.0 to 1000.0 [kPa]

Pressure value moving
average times
Compressibility Compressibility factor
factorfixed value
calculation
Methane CH4
relatedNitrogen N2
Carbon dioxide CO2
Ethane C2H6
Propane C3H8
Isobutane i-C4H10
Butane C4H10
Isopentane i-C5H12
Pentane C5H12
Hexane C6H14
Heptane C7H16
Octane C8H18
Nonane C9H20
Decane C10H22
Hydrogen H2Oxygen O2

9

1 to 4 [times]

Std[Pressure Sensor
Specification]
0: ON
200, 500, 1000: OFF[Pressure Sensor
Specification]
0: 101.3
200, 500, 1000: 0.010.800 to 1.200
1.000
0.000: Fixed value setting disabled
0.000 to 1.000
0.800
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.200
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000
0.000 to 1.000
0.000Category 1
Category 2
Category 3
Item
Item
Item
Item
Item
No.
No.
F1
Measurement F1-3 Compressibility Carbon monoxide CO
factor
Water H2O
calculation
relatedHydrogen sulfide H2S
Helium He
Argon Ar
F2
Maintenance Maintenance
Maintenance
F3
OutputF3-1 Flow rate pulse Selection of pulse
output related output flow rate
Unit pulse output unit
Maintenance
Pulse output ON width
F3-2

F4
F5
-

Maintenance Maintenance Blank-

Communication
Communication bit rate
related
RTU address
Maintenance
Maintenance
Maintenance
Maintenance-

Scope of configuration

Factory default settings

0.000 to 1.000
0.000 to 1.000
0.000 to 1.000

0.000
0.000
0.000

0.000 to 1.000
0.000 to 1.000
Act: Actual flow rate
Std: Converted flow rate
100, 1000, 10000 [L]50, 125, 250, 500, 1000 [ms]
Duty

0.000
0.000
-

4800, 9600 [bps]4800

000 to 255
-

001
-

Std
1000
duty

3-2. Configuration Change Procedure
To change the configuration, refer to the display switching flow (Fig. 3-1) and operate the buttons.
The buttons can be operated by removing the lid on the back side. To press SW3, use the supplied
hexagonal wrench or similar tool.
*1 Do not press SW3 with a sharp object as it may cause damage.
*2 After changing the configuration, securely attach the gasket and close the lid. The screws should
be tightened diagonally with even torque. (Recommended torque: 1.0 [N·m])

Screws to prevent falling off(8 places)

10Maintenance

Measurement

SW1long press

Flow measurement
relatedSW2long press

SW1long press
SW2long press

Maintenance

MaintenanceSelection of
displayed
conversion flow
rate

Setting Converted flow rate

Setting
Instantaneous flow
moving averagetimes

Actual flow rate

4 times
SW1: Change setting value

Setting
SW1: Change setting digit
SW2: Addition of setting
digits**Change the sign of thehighest digit
0: Plus-: Minus

Conversion
reference
temperature

Setting
Conversion
reference pressure

Pressuremeasurement related

SW1long press
SW2long press

SW1: Change setting digit
SW2: Addition of setting
digitsSetting
Enable/Disablesupply gaspressure setting

EnabledDisabled

Setting
Supply gaspressure in normal
mode

Maintenance

SW1: Change setting digit
SW2: Addition of setting
digitsCompressibility
factor calculation

Setting
Pressure value
moving averagetimes

Fig. 3-1. Display Switching Flow (1/4)

11

1 timeSW1: Change setting value

Pressuremeasurement related

Compressibility factor
calculation

SW1
long press
SW2long press

Setting
Compressibility
factor fixedvalue

SW1: Change setting
digit
SW2: Addition ofsetting digits

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Methane CH4

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Nitrogen N2

Setting
Carbon dioxide
CO2

SW1: Change setting
digit
SW2: Addition ofsetting digits

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Ethane C2H6

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Propane C3H8

Setting
Isobutane
i-C4H10

SW1: Change setting
digit
SW2: Addition ofsetting digits

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Butane C4H10

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Isopentane
i-C5H12

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Pentane C5H12

Setting
Hexane C6H14

Heptane C7H16

Fig. 3-1. Display Switching Flow (2/4)
12

SW1: Change setting
digit
SW2: Addition ofsetting digits

Hexane C6H14

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Heptane C7H16

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Octane C8H18

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Nonane C9H20

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Decane C10H22

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Hydrogen H2

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Oxygen O2

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Carbonmonoxide CO

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Water H2O

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Hydrogensulfide H2S

Setting
SW1: Change setting
digit
SW2: Addition ofsetting digits

Helium He

Setting
Argon Ar

Fig. 3-1. Display Switching Flow (3/4)

13

SW1: Change setting
digit
SW2: Addition ofsetting digits

MaintenanceOutputSW1long press

Flow ratepulse output

SW2
long press

SW1long press
SW2long press

Setting

Actual flow rate

Converted flow rate

Selection ofpulse output flow
rate

Setting
SW1: Change setting
value

Unit pulse output
unit

Maintenance

Setting
Pulse output
ON width

SW1: Change setting
value

Communication

SW1
long press
SW2long press

Setting
Communication
bit rate

Setting
RTU address

Maintenance

Blank

Fig. 3-1. Display Switching Flow (4/4)

14

SW1: Change setting
digit
SW2: Addition ofsetting digits

3-3. Details of Configuration Items[F1-1] Selection of Displayed Conversion
Select the accumulated forward flow rate on the main display from "Actual flow rate (Act)" or"Converted flow rate (Std)." The factory default for this flow meter is "Converted flow rate (Std)."[F1-1] Instantaneous flow moving average times
Select the moving average times for displaying and outputting the instantaneous flow. The factory
default setting for this flow meter is 4 times, and the last 4 times measurement values are used.
Although there is no need to change the moving average times in normal use, you can select "No
moving average (01)," "2 times (02)," "3 times (03)," ... "14 times (14)," "15 times (15)," or "16 times(16)."[F1-1] Conversion reference temperature
For flow rate conversion, set the reference temperature within the range of -10.0 to +60.0°C. The
factory default is "0.0°C."[F1-1] Conversion reference pressure
For flow rate conversion, set the reference pressure in increments of 0.01 kPa within the rangeof 0.00 to 10.00 kPa (gauge pressure). The factory default is "0.00" kPa.
[F1-2] Enable/Disable supply gas pressure setting
Select "Enable (ON)" or "Disable (OFF)" for enable/disable of the setting value of working
pressure.
The factory default for this flow meter is "Enable" when the pressure sensor specification is 0,
and "Disable" when it is other than 0.
[F1-2] Supply gas pressure
Set the working pressure within the range of "0.0 kPa (0.0)" to "1000.0 kPa (1000.0)."
The factory default setting is "101.3 kPa (101.3)" when the pressure sensor specification is 0,
and "0.0 kPa (0.0)" when it is other than 0. Used when the supply gas pressure setting is set to"Enable (on)."[F1-2] Pressure value moving average times
Select the moving average times for pressure display from "Once (1)" to "4 times (4)." Setting"Once (1)" disables moving average.
[F1-3] Compressibility factor fixed value
Select the compressibility factor correction value from "0.800" to "1.200" and "0.000." When
"0.800" to "1.200" is set, the fixed setting value becomes valid and is used for flow conversion.
When "0.000" is set, the fixed setting value becomes invalid and the compressibility factor
calculated by composition input is used for flow conversion. The factory default for this flow meteris "1.000."15[F1-3] Gas composition
When the compressibility factor fixed value is set to "0.000," which is invalid, this gas composition
is used to determine the compressibility factor inside the flow meter. Twenty-one (21) types of gas
composition can be entered. (CH4, N2, CO2, C2H6, C3H8, H2O, H2S, H2, CO, O2, i-C4H10,
n-C4H10, i-C5H12, n-C5H12, n-C6H14, n-C7H16, n-C8H18, n-C9H20, n-C10H22, He, Ar)
The calculation method is based on ISO 12213-1:2006 and ISO 12213-2:2006. The gas
composition is set in mole fractions from "0.000" to "1.000." Enter the total gas composition to be
1.000.
When gas composition is entered or when the battery is turned on, the mode is automaticallyshifted to "Compressibility factor calculation mode." "Compressibility factor calculation mode" stops
ultrasonic measurement and output. After the calculation of the compressibility factor is completed,it automatically enters the measurement mode. If a fixed value is entered, the mode does not shift
to the "Compressibility factor calculation mode."
When the battery is turned on

Compressibility factor
calculation mode

Measurement mode

Configuration mode(a) When the battery is turned on

When the battery is turned on

Compressibility factor
calculation mode

Compressibility factor
calculation mode

Measurement mode(b) When setting gas composition by button

Measurement mode(c) When setting gas composition via communication
Fig. 2-2. Compressibility Factor Calculation Mode Display[F3-1] Selection of pulse output flow value
Select the pulse output flow value. "Converted flow rate (std)" is selected as the default setting
for this flow meter. In the "Actual flow rate (Act)" mode, the output signal corresponds to the actualflow.
In the "Converted flow rate (Std)" mode, the output signal corresponds to the conversion flow.
The converted flow rate is calculated based on the temperature t [°C] and pressure p [kPa]measured at the same time as the flow rate.
Q2 = Z × (T2/(T1 + t)) × (p/P1) × Q1
Q2: Converted flow rate [Nm3/h]

Q1: Actual flow rate [m3/h]

Z: Compressibility factor

T2: Absolute temperature of conversion
reference temperature [K]T1: Absolute temperature of 0°C (= 273.15 [K])t: Fluid temperature [°C]

P1: Absolute pressure of conversion reference pressure [kPa abs]
p: Measurement pressure (absolute pressure) [kPa abs]

16

[F3-1] Unit pulse output unit
Select the output unit from "10000," "1000," or "100" (unit: [L/P] or [NL/P]). This is reflected in the
output unit pulse of the contact output (unit pulse: forward flow). The range of setting values thatcan be selected is limited according to the nominal diameter.
Table 2-2 shows the selectable ranges for each nominal diameter.
When the unit pulse output unit is changed, the pulse output ON width is automatically set to"Duty 50%."
Table 2-2. Selectable Range【ワンショット】[One-shot]＜40A＞
output unit [L/P] / [NL/P]
ﾊﾟﾙｽ出力単位[L/P]/[NL/P]
パルスON
Pulse
ON Pulse
width
[ms]
幅[ms]
100
1000
10000
50
125
250
500
1000

＜100A＞
Pulse
ON
パルスON
width
[ms]
幅[ms]
50
125
250
500
1000

○
○
×
×
×

○
○
○
○
○

＜50A＞
パルスON
Pulse
ON
width
[ms]
幅[ms]

○
○
○
○
○

Pulse
output unit [L/P] / [NL/P]
ﾊﾟﾙｽ出力単位[L/P]/[NL/P]
100
1000
10000
×
○
○
×
○
○
×
○
○
×
×
○
×
×
○

50
125
250
500
1000

＜150A＞
Pulse
ON
パルスON
width
[ms]
幅[ms]
50
125
250
500
1000

[Duty 50%]
【デューティ50％】
Pulse
output unit [L/P] / [NL/P]
ﾊﾟﾙｽ出力単位[L/P]/[NL/P]
Nominal口径
Diameter
100
1000
10000
40
50
80
100
150
250

○
○
○
×
×
×

○
○
○
○
○
○

○
○
○
○
○
○

Pulse
output unit [L/P] / [NL/P]
ﾊﾟﾙｽ出力単位[L/P]/[NL/P]
100
1000
10000
○
○
○
×
○
○
×
○
○
×
○
○
×
○
○

Pulse
output unit [L/P] / [NL/P]
ﾊﾟﾙｽ出力単位[L/P]/[NL/P]
100
1000
10000
×
○
○
×
○
○
×
×
○
×
×
○
×
×
○

＜80A＞
パルスON
Pulse
ON
width
[ms]
幅[ms]
50
125
250
500
1000

＜200A＞
Pulse
ON
パルスON
width
[ms]
幅[ms]
50
125
250
500
1000

Pulse
output unit [L/P] / [NL/P]
ﾊﾟﾙｽ出力単位[L/P]/[NL/P]
100
1000
10000
○
○
○
×
○
○
×
○
○
×
○
○
×
×
○

Pulse
output unit [L/P] / [NL/P]
ﾊﾟﾙｽ出力単位[L/P]/[NL/P]
100
1000
10000
×
○
○
×
×
○
×
×
○
×
×
○
×
×
×

○:
Selectable〇：選択可能×:
Not selectable
×：選択不可[F3-1] Pulse output ON width
Select from duty method ["Duty 50% (----)"] or one-shot method [pulse ON width "50 ms (50),""125 ms (125)," "250 ms (250)," "500 ms (500)," and "1000 ms (1000)"]. The factory default is "Duty
50% (----)."The selectable pulse output units are limited according to the output method and one-shot pulse
ON width. See Table 2-2 for details.
When the unit pulse output unit is changed, "Duty 50% (----)" is automatically set.
[F3-2] Communication bit rate
Select the communication bit rate from "4800" or "9600" (bps). The factory default for this flow
meter is "4800."[F3-2] RTU address
Select an RTU address from "000" to "255." The factory default for this flow meter is "001."
Maintenance setting
Do not alter the settings for maintenance functions.
17

4. Installation
It is recommended that the setting operations (see "3. Configuration") and the orientation
adjustment of the display section (see "4. Installation section 8)") be performed before the flow
meter is installed.
Applied piping
This flow meter satisfies the flow rate measurement accuracy with the recommended piping innerdiameters in Table 4-1 below.
(If you use piping that differs from the recommended piping inner diameters in Table 4-1, the flow metermay not satisfy the flow rate measurement accuracy. If you are considering using a piping different fromthe recommended piping inner diameters in Table 4-1, contact us in advance.)
Table 4-2 shows an example of piping standards and dimensions where the piping inner diametersatisfies the requirements of Table 4-1.
Table 4-1. Recommended Piping Inner Diameter

NominalDiameter
Piping Inner
Diameter

25

32

40

50

80

100

150

200

25

32

40.3

50

79.9

100

150

199.1

Connection
MethodISO 7005-1 (GB/T9119-2000 PN1.6 MPa flange) equivalent

Table 4-2. Example of Piping Standards and Dimensions Satisfying the Recommended Piping Inner
Diameter

PipingStandard
NominalDiameter (mm)Outer
Diameter (mm)Thickness(mm)

ISO 7005-1
25

32

40

50

80

100

150

200

32

38

45

57

89

108

159

219

3.5

3

2.5

3.5

4.5

4

4.5

9.5

18

Piping conditions
1) Align the forward flow direction of the fluid with the arrow marked on the body.
2) For this flow meter, a straight pipe length as shown in Fig. 4-1 is recommended according to thepiping conditions.

Conditions

Upstream

Downstream
50D or longer

90°
elbow/fullbore valve
fully
opened10D or longer

20D or longer
Joining
10D or longer

20D or longer
50D or longer
Expandingpipe

10D or longer

10D or longer

Narrowingpipe

Fig. 4-1. Recommended Straight Pipe Length 1 (D: Nominal Diameter)193) When the flow meter is installed near a pressure reducing valve or flow regulating valve, ultrasonicnoise may be generated inside the piping. Therefore, strictly adhere to the "necessary straight pipe
length L*" as shown in Fig. 4-2 below.
In particular, please note that there are significant restrictions when installing the flow meter
downstream of a pressure reducing valve. (If the necessary conditions are not met,
measurement may not be possible.)*When using elbows, replace "necessary straight pipe length" with "necessary pipe length (including
bent pipe)." Also, 10D before the flow meter should be provided as a straight pipe.
Maximum Flow

Necessary Straight Pipe Length L (mm) =× (0.8)Number of Elbows

Velocity Used [m/s]

10D + Differential Pressure [kPa] × D ×

20 [m/s]

When installing the flow meter downstream of the pressure reducing valve
With elbow(Elbows attenuate ultrasonic noise. If more than one
elbow is used, the required length will be shorter.)Without elbow

Pressure
reducing
valve

Pressure
reducing
valve

Without elbow (L)*(10D minimum)
Distance between
pressure reducing valve
and flow meter (L)(Example of Calculation)
Example 1: Diameter 50A, flow velocity 10 m/s, without elbow
where P1 = 25 kPa and P2 = 5 kPa

Distance from 90° elbow
to flow meter
10D or longer

Example 2: Diameter 50A, flow velocity 10 m/s, without elbow
where P1 = 160 kPa and P2 = 10 kPa(Example of Calculation)
Example 1: Diameter 50A, flow velocity 10 m/s, one (1)elbow used
where P1 = 160 kPa and P2 = 10 kPa

減圧弁の上流に流量計を設置する場合
When installing theflow meter upstream of the pressure reducing valve

Pressure

reducing
減圧弁
valve

20D
or longer
20D以上

Fig. 4-2. Recommended Straight Pipe Length 2 (D: Nominal Diameter)(When the Flow Meter is Installed Near a Pressure Reducing Valve or Flow Regulating Valve)204) Install the flow meter so that the center axis of the flow meter and the center axis of the piping arealigned. Be sure to use the supplied centering collars to reduce the misalignment of the center axis
between the flow meter and the piping. If the collars are not used, the flow meter cannot be usedwithin the guaranteed accuracy range.
For upstream installation, as shown in Fig. 4-3, insert the supplied centering collars diagonally into
the holes in the gasket and flange.
Downstream

Upstream

Centering collar

Fig. 4-3. Example of Installation of Centering Collars5) This flow meter can be installed indoors or outdoors, and can be installed horizontally or vertically.
Install it in the middle of the straight pipe section.
*1 When there is a lot of mist or dust in the piping, vertical piping is recommended.
*2 This flow meter is not fully waterproof (IP65). Do not install the flow meter where it may besubmerged in water.
*3 When the flow meter is installed in a location exposed to direct sunlight, it is recommended to
install a sunshade.
*4 If the flow meter is to be installed in a location where it will be exposed to rainwater, install it sothat the display section does not face downward.
6) Flange type flow meters should be secured with M12 (for nominal diameter 25A), M16 (for nominal
diameters 32A, 40A, 50A, 80A, and 100A) or M20 (for nominal diameters 150A and 200A) bolts andnuts with torque within the range shown below (see Fig. 4-3.). When tightening, use even force to
avoid one-sided tightening.
AS25: 80 to 100 N·m

AS32: 140 to 160 N·m

AS40: 160 to 180 N·m

AS50: 220 to 240 N·m

AS80: 330 to 350 N·m

AS100: 130 to 150 N·m

AS150: 290 to 310 N·m

AS200: 240 to 260 N·m

7) Care should be taken to ensure that the gasket to be installed on the flange does not protrude into
the piping.

218) You can change the orientation of the display section by rotating it.
It is recommended to rotate the display section before installing theflow meter. To change the orientation of the display section, loosen
the set screws in the neck of the display section with the supplied
M4 hex wrench, and then rotate the display section. Once thedisplay section is rotated in the desired orientation, be sure totighten the set screws to secure the display section.

Display direction*1 The display section can be turned 90° clockwise and 180° counterclockwise from the factory set
position.
*2 When rotating the display section, do not apply any force other than the direction of rotation.
9) Be careful not to let foreign objects such as welding tips, dust or sealants enter the piping. If thepiping is new, clean the piping thoroughly before installation.
10) Do not install the flow meter where it will be subjected to strong compressive or tensile forces orother loads after installation.
11) When piping, do not touch the inside of the flow meter, especially the ultrasonic sensors. (See "12. Part Names".)Also, do not drop, strike, or subject the flow meter to excessive shock.
Do not hold the display section of this flow meter.

22

5. Wiring
Use the optional external connection cable to connect as follows.

Connector

Flow rate pulse output

White

Communication (+)

Yellow

RS485 power supplyRed

Not available

Green

Communication (-)

Brown

Not available

Blue

GND

Black

*3
Fig. 5-1. External Connection Cable Wiring Diagram*1 The body and GND are electrically common.
*2 If necessary, use an isolated power supply and indicator.
*3 If the flow meter is installed near a noise source, ground the braided shield attached to the external
connection cable.

Note: For cable length
When extending the external connection cable, use the cable lengths shown below as a guide.
- Communication line (cable color: brown, yellow): Up to 100 m- Signal line (cable color: white, green, blue, red, black) : Up to 20 m
*1 For cable extension, "UL20276" 7 × 0.14 mm2 cable is recommended.
*2 The maximum cable length may vary depending on the installation environment, connection
equipment, and type of cable used.
*3 If the cable is too long, the signal may be attenuated or noise may be easily superimposed.

236. Operation
Do not open and close the valve at once, but open and close slowly.
Rapid opening and closing of the valve when there is a pressure difference between the upstream
and downstream sides of the valve can cause the flow meter to fail. When starting operation, makesure the pilot lamp is blinking. (A blinking pilot lamp indicates fluid flow.)

Note: At the start of operation
When installing and starting operation of the flow meter, the ALARM1 may turn on in rare cases
due to a sudden change in pressure from atmospheric air pressure. However, the ALARM1 will turnoff once the fluid stabilizes under the operating pressure. (This is not an error.)

7. Operation Description of the Display Section
A. Operation
1) In normal (measurement mode), the main display section (upper part) shows the forward
converted accumulated value or forward actual accumulated value, and the sub-display section(lower part) shows the instantaneous converted flow rate, instantaneous actual flow rate,pressure or working pressure, temperature, and maintenance by automatic switching every 2.5
seconds. (Fig. 7-1)
2) The three buttons on the back of the display section allow you to make various local settings.
3) See Fig. 1-1 for the location of "SW1," "SW2" and "SW3."
4) By operating the buttons shown in Table 7-1, you can shift to various modes as shown in Fig. 7-1.
Table 7-1. Switching Method between Measurement and Configuration Modes
Button operation
SW3

Measurement mode
Switch toconfiguration mode

Configuration mode
Configuration display

Configuration change

Switch to measurement mode

SW1 + SW2 (simultaneous

Switching between configuration display andpress)

configuration change

24

Measurement mode
Main Display
Accumulated forward flowrate
Forward converted
accumulated value
Switching byconfiguration
Forward actual
accumulated value

Sub-display
Forward converted accumulated value
2.5 seconds elapsed

Instantaneousconverted flow rate

2.5 seconds elapsed

Instantaneous
actual flow rate

2.5 seconds elapsed

Pressure

2.5 seconds elapsed

MaintenanceTemperature

2.5 seconds elapsed

Forward actual accumulated value
2.5 seconds elapsed

Instantaneous
actual flow rate

2.5 seconds elapsed

Pressure

2.5 seconds elapsed

MaintenanceTemperature

2.5 seconds elapsed

Automatic switching
SW3: 1 time

SW3: 1 timeCompressibility factor calculation
mode
SW3: 1 time

Gas composition not entered

Gas composition entered

Configuration mode
Configuration display

Configuration change

Fig. 7-1. Method of Switching Displays and Entering Various Modes in Measurement ModeB. Functions in each mode
1) Measurement mode
- Main display section (upper part)

Forward converted accumulated value (Nm3)25

Forward actual accumulated value (m3)- Sub-display section (lower part)
The following items are automatically switched every 2.5 seconds according to the flow
conversion setting (converted flow rate or actual flow rate).
Converted flow rate display: instantaneous converted flow rate, instantaneous actual flow
rate, pressure*1, temperature, maintenance*2
Actual flow rate display:

instantaneous actual flow rate, pressure*1, temperature,
maintenance*2*1 The displayed pressure value will vary depending on whether the pressure sensor is installed ornot.
Pressure sensor not installed: Displays the set absolute pressure.
Pressure sensor installed: Display the measured absolute pressure.
*2 Displays the success rate of ultrasonic measurement (the number of successful ultrasonicmeasurements in 10 measurements) in 4 levels.
(Number of Successes: Level 1: 0 to 2 times, Level 2: 3 to 5 times, Level 3: 6 to 8 times, Level
4: 9 to 10 times)

Level 1

Level 2

Level 3

Level 4

2) Configuration mode
(1) Press "SW3" once to shift from measurement mode to configuration mode. Press "SW3"again to shift from configuration mode to measurement mode. To press "SW3," use thesupplied hexagonal wrench or similar tool.
Do not press "SW3" with a sharp object as it may cause damage.
(2) In the configuration mode, you can change the settings shown in "Table 3-1. Configuration
Items and Standard Factory Settings."(3) Refer to "Fig. 3-1. Display Switching Flow" for how to operate the buttons in the configuration
mode.

26

8. Error Display and Output
1) Ultrasonic measurement error[Status] Ultrasonic measurement has failed.
[Display] Instantaneous flow rate is displayed as "0.00" and "ALARM1" in the upper left corner of the
LCD screen turns on.
The accumulated flow rate stops accumulating with the value displayed immediately before
the error occurred.

[Output] Flow rate pulse output: Stopped[Cause] Foreign matter (fluid such as oil) that interferes with the propagation of ultrasonic waves may
adhere or stay inside the measurement pipe. If the alarm display does not disappear after
removing the foreign matter, please contact us.
2) Battery voltage drop error[Status] The built-in battery is depleted.
[Display] "ALARM2" in the upper center of the LCD screen turns on.

[Output] Flow rate pulse output: Normal operation[Measures] After "ALARM2" turns on, you can measure (at room temperature) for about one (1)month, but please replace the unit as soon as possible.

27

3) Pressure value error[Status] Pressure sensor failure, etc.
[Display] The instantaneous flow rate is "0.00" and the pressure indicates the detected error value
and blinks. (Temperature display and maintenance display remain lit.)
The accumulated flow rate stops accumulation mode with the value displayed immediately
before the error occurred.

点滅
Blinking[Output] Flow rate pulse output: Stopped[Measures] Please consult with us.

4) Temperature value error[Status] Temperature sensor failure, etc.
[Display] The instantaneous flow rate is "0.00" and the temperature indicates the detected error value
and blinks. (Pressure display and maintenance display remain lit.)
The accumulated flow rate stops accumulation mode with the value displayed immediately
before the error occurred.

Blinking
点滅[Output] Flow rate pulse output: Stopped[Measures] Please consult with us.

28

9. Specifications
Nominal Diameter
Power Supply
Measurable
fluids*1)

25A

32A

40A

AS-W

AS-W

AS -C *2)
Flow Rate Range (Actual
Flow Rate)*3) [m3/h]±5%RD[m3/h]
Flow(or more to less
Rate
than)
Measure±2%RD
ment[m3/h]
Accuracy(or more to or
less)
Flow Rate Conversion
Error*4)Standard Low Flow Cut-off[m3/h or less]Pressure Loss
Fluid Temperature and
Humidity

80A

100A

200A

Air
A: Absolute Pressure Sensor
0.07 to 0.5 MPa
specification(AS-W-**-500BA)(AS-W-**-0BA)
0.07 to 0.2 MPa
specification(AS-W-**-200BA)

0.07 to 1.0 MPa specification (AS-W-**-1000BA)(AS-W-**-0BA)
0.07 to 0.5 MPa specification (AS-W-**-500BA)
0.07 to 0.2 MPa specification (AS-W-**-200BA)

0.07 to 1.0 MPa specification (AS-C-**-1000BA)±0.7 to 35±1.3 to 65±1.6 to 80±3 to 150

±6 to 300

±10 to 500±24 to 1200

±40 to 2000

0.7 to 3.5

1.3 to 6.5

1.6 to 8

3 to 15

6 to 30

10 to 65

24 to 120

40 to 200

3.5 to 35

6.5 to 65

8 to 80

15 to 150

30 to 300

50 to 500

120 to 1200

200 to 2000

±1.5

±3.2

±5.7

±1.8%
±0.1

±0.2

±0.2

±0.4

±0.8

Almost zero (equivalent to straight pipe)-20 to +40°C

90%RH or Less

00000000.0 Nm3 9 digits (AS-WE-40, 50, 80)
0000000000 Nm3 10 digits (AS-WE-100, 150, 200)(1) Maximum Display ±19999 Nm3/h (Converted Flow Rate)
Instantaneous (2) Maximum Display ±19999 m3/h (Actual Flow Rate)
Flow Rate(Less than 200 is displayed to 2 decimal places, 200 to less than 2000 is displayed to 1 decimal place,and 2000 or more is displayed to integer.)
Display value
Units
Display value × 1
× 10
Temperature
00.0°C 3 digits
Pressure
0000.0 kPa 5 digits
Maintenance
Success rate of ultrasonic measurement is displayed in 4 levels.
Accumulated
Flow Rate

Display

150A

Natural gas

AS-C
Pressure Sensor

Working
Pressure(Absolute
Pressure)

50A

Built-in lithium thionyl chloride battery, battery life 11 years (Includes 1 year storage period) (At an
ambient temperature of 20°C)

Alarm

ALARM1 (ON): Ultrasonic wave signal is low or cannot be received
ALARM2 (ON): Battery voltage drops
Sub-display section (Blinking): Temperature or pressure value is abnormal.

29

Nominal Diameter
Communication

25A

32A

40A

50A
80A
RS485 MODBUS/RTU

External
Power Supply
Rated
Voltage

100A

150A

200A

+9 to +26.4 VDC-9 to +9 VDC

OutputNch open drain output
Contact output 1: Unit pulse (forward flow), Pulse output unit: 100, 1000, 10000 L/P or NL/P
Maximum rated voltage: 26.4 VDC
Contact Output
Maximum rated current: 50 mA
Saturation voltage at ON: 1.5 V or lessSaturation current at OFF: 50 μA or less
Following 11 items:
Instantaneous converted flow rate, instantaneous actual flow rate, pressure, temperature, forward
Stored Items
converted accumulated value, forward actual accumulated value, reverse converted accumulated value,
History
storage time, forward converted accumulated value (volume) used during storage period, forward actual
Storageaccumulated value (volume) used during storage period, and error information
Function*5)
Number of
6600 data (Eleven stored items are considered a single data item.)Stored Data
Storage Interval

5 minutes to 24 hours (can be changed in increments of 5 minutes)

Response
Connection Method
Mounting Orientation
Gas Contact Material
WeightInstallation Location

2 seconds
3 seconds
ISO7005-1 (GB/T9119-2000 PN1.6 MPa flange)
Horizontal or Vertical (It is prohibited to install the display section downward.)
Aluminum alloy
Stainless alloy
3.5 kg

4.2 kg

8.4 kg

PPS, fluorosilicone rubber, etc.
10.4 kg
14.1 kg
14.0 kg
Indoor or Outdoor (IP65 equivalent)

Storage Temperature

21.2 kg

36.2 kg-25 to +70°C, non condensing*1) When used in natural gas measurement, the limit is set for the working pressure relative to the volume
ratio of methane. See Table 9-1 for details.
*2) Negative pressure fluid cannot be measured.
*3) See Table 9-2 for the converted flow rate range.
*4) Conversion error when each pressure sensor is at F.S. (temperature range: -20 to 40°C).
*5) Refer to the communications specifications for details.

30

Table 9-1. Availability of Measurement for Methane Concentration
Nominal Diameter

Methane Concentration Range

Working Pressure (absolute)

99 to 100%

250 kPa or more

97 to 99% or less

150 kPa or more

97% or less

No restrictions

98 to 100%

100 kPa or more

98% or less

No restrictions

200A

150A

*No restriction for the 100A or lower models.

Table 9-2. Converted Flow Rate Value [Conversion Example]
Conversion Temperature [°C]

0 (Nm3/h)

20 (S*m3/h)

Conversion Pressure

1atm

1atm

Working Pressure [MPa]0.10133

Working Temperature [°C]

0

30

0.15
0

0.7 [m3/h]

0.10133
30

0

30

0.15
0

30

0.7
0.6
1.0
0.9
0.8
0.7
1.1
1.0
35 [m3/h)
35.0
31.5
51.8
46.7
37.9
33.3
55.6
50.1
1.3 [m3/h]
1.3
1.2
1.9
1.7
1.4
1.2
2.1
1.9
32A
3
65 [m /h]
65.0
58.6
96.2
86.7
69.8
61.8
103.3
93.0
3
1.6 [m /h]
1.6
1.4
2.4
2.1
1.7
1.5
2.5
2.3
40A
3
80 [m /h]
80.0
72.1
118.4
106.7
84.4
76.0
124.9
112.6
3
3 [m /h]
3.0
2.7
4.4
4.0
3.2
2.9
4.7
4.2
50A
3
150 [m /h]
150.0 135.2
222.0
200.1
158.2
142.6
234.2
211.1
3
6 [m /h]
6.0
5.4
8.9
8.0
6.3
5.7
9.4
8.4
80A
3
300 [m /h]
300.0 270.3
444.1
400.1
316.5
285.2
468.5
422.1
3
10 [m /h]
10.0
9.0
14.8
13.3
10.5
9.5
15.6
14.1
100A
500 [m3/h]
500.0 450.5
740.2
666.9
527.5
475.3
780.8
703.5
24 [m3/h]
24.0
21.6
35.5
32.0
25.3
22.8
37.5
33.8
150A
3
1200 [m /h] 1200.0 1081.2 1776.4 1600.6 1265.9 1140.6 1873.9 1688.5
40 [m3/h]
40.0
36.0
59.2
53.4
42.2
38.0
62.5
56.3
200A
3
2000 [m /h] 2000.0 1802.1 2960.6 2667.6 2109.8 1901.0 3123.2 2814.1*Even in the standard conversion mode, the LCD screen displays values in Nm3/h.
25A

31

10. External View

25A, 32A

40A to 80A

100A to 200A

Fig. 10-1. External View
Model

W [mm]

H [mm]

AS - [Specification] - 25 - [Pressure Sensor Specification] BA/5

160

272

AS - [Specification] - 32 - [Pressure Sensor Specification] BA/5

160

272

AS - [Specification] - 40 - [Pressure Sensor Specification] BA/5

200

297

AS - [Specification] - 50 - [Pressure Sensor Specification] BA/5

220

311

AS - [Specification] - 80 - [Pressure Sensor Specification] BA/5

250

343

AS - [Specification] - 100 - [Pressure Sensor Specification] BA/5

250

377

AS - [Specification] - 150 - [Pressure Sensor Specification] BA/5

300

434

AS - [Specification] - 200 - [Pressure Sensor Specification] BA/5

350

492

11. Battery LifeThe built-in battery life is 11 years. (Includes 1 year storage period. This is guaranteed at an ambient
temperature of 20°C.)
If the battery runs out, please contact us.

32

12. Troubleshooting
TimingPhenomenon

Possible Cause
Coping Methods
A fluid other than that specified is
flowing.
Check and follow the precautions in "For Safe and Proper
Flow meter is used outside the Use" [pages 3 to 5] and "Specifications" [pages 29 andspecification range (installation 30].
conditions,pressure,temperature, etc.).
ALARM1 turns on.
Foreign matter is adhered to theinside of the measurement part or Check for and remove any foreign matter.
to the ultrasonic sensor.
Immediately
after
Eliminate the noise source or shield the flow meter.
There is a large electrical noise
installation
Ground the braided shield when using the externalsource near the flow meter.
connection cable. [See page 23.]
Check that the divider line between the main display andoperation
for the sub-display is blinking.
Accumulation does not start Adjustmentpressurefluctuationisin
immediately after installation. progress.
Blinking stops after about a minute and accumulation
operation starts.
The direction of fluid flow and the
Displayed instantaneous flow arrow flow direction of the flow Check that the arrow direction on the outside surface ofrate is negative.
the flow meter is aligned with the direction of fluid flow.
meter are opposite.
The built-in battery is running out of power. Please
ALARM2 turns on.
Battery voltage is low.
contact us.
Sub-display blinks.
(Instantaneous standard flow
rate, instantaneous actual flow Pressure sensor is faulty.
Please contact us.
rate,
and
pressureareblinking.)
Sub-display blinks.
(Instantaneous standard flow
rate, instantaneous actual flow Temperature sensor is faulty.
Please contact us.
rate, and temperature areblinking.)
Flow meter is operating normally.
To reduce instantaneous flow fluctuations, it is
Pressure frequently fluctuates.
recommended that the flow meter be installed in alocation where pressure fluctuations are small.
Measurement cannot be performed correctly in a
Instantaneous
flow
rate
There is a pulsation.
pulsating environment. Install the flow meter in a placefluctuates greatly.
where there is no pulsation.
Flow meter is operating normally.
There is a pressure reducing To reduce instantaneous flow fluctuations, it isvalve near the flow meter.
recommended to install the flow meter away from thepressure reducing valve. (See Fig. 4-2 [page 20].)
Displayed instantaneous flow
Gas is circulating through therate does not become zero piping.
Flow meter is operating normally.
even though there is no flow.
The instantaneous flow rate is
Depending on the piping conditions, install a straight pipe
too high.
The length of the straight pipe is of the recommended length in the upstream and
After
The instantaneous flow rate is insufficient.
downstream of the flow meter. (See Fig. 4-1 [page 19].)
Operation too low.
The instantaneous flow rate Excessive flow exceeding the Use within the specification range. (See [page 29 anddoes not appear to change.
specification range is flowing.
30].)
The divider line between the Adjustment
operationformain display and the sub- pressure
fluctuationisin Blinking stops after about a minute and accumulation
operation starts.
display is blinking.
progress.
Clean the inside of the measurement pipe according to
the following method. Repeat the cleaning procedure until
the ALARM1 turns off.
*1 Do not hold the display section while cleaning.
*2 Do not touch the ultrasonic sensors.
<In case of dirt adhesion due to oil>
(1) Seal one side of the measurement part (pipe).
Foreign matter is adhered to the (2) Pour spindle oil into the measurement part and leaveinside of the measurement part orit in place for 1 to 2 hours.
to the ultrasonic sensor.
(3) Spend over an hour to drain the spindle oil.
ALARM1 turns on.

<In case of dirt adhesion due to something other than oil>
(1) Seal one side of the measurement part (pipe).
(2) Pour water into the measurement part and gently
shake it up and down 4 to 5 times. If the dirt is notremoved, repeat the procedure.
(3) Drain the water from the measurement part and allow
to dry naturally.
The operating conditions havechanged and the flow meter is Check and follow the precautions in "For Safe and Proper
used outside the specification Use" [pages 3 to 5] and "Specifications" [pages 29 andrange (installation conditions, 30].
pressure, temperature, etc.).

If the troubleshooting procedures do not resolve the problem, please contact us.

33

Memo

- Warranty and After-Sales Service1) Warranty Period
For a period of one (1) year from the date of purchase, we will deliver a replacement productfree of charge if the failure is clearly attributable to a fault in our manufacturing process.
2) Scope of Warranty
The warranty does not cover the following cases:- Failure caused by force majeure such as natural disasters, conflicts, and disasters.
- Failure caused by disassembly or modification.
- Failure caused by improper handling.
- Failure caused by use outside the scope of the specifications (e.g., environment).
- Other cases that are deemed outside the scope of our responsibility.
The warranty described here refers to the warranty for our products alone, and does not coverany damage to the customer caused by the failure of our products (damage or injury to otherthan our products, lost profits, opportunity losses, transportation costs, construction costs, etc.).
3) Requesting for Service
Regardless of whether you are under warranty, please provide us with the product name,model (AS-W or AS-C), construction number, serial number and option availability, and as muchdetail as possible regarding the failure.

second Edition
April

18