Product Specifications

Working pressure(Absolute pressure)

AS-W

AS-C
±5%RD (m3/h)±2%RD (m3/h)

Low flow cut off(start flow rate) *2

Flow rate (m/s)
Actual flow rate (m3/h)

Fluid temperature and humidity

Pressure loss

Display

Accumulated ﬂow volume

OutputAS-W-32-

Nominal diameter
Power supply
Measurable ﬂuid

Flow ratemeasurement
precision *1

AS-W-25

AS-W（For Natural Gas）

Model

Instantaneous
ﬂow rate *3
Temperature *3
Pressure *3
Maintenance *3
Contact output
Electronic statement signal communica�onConnec�on method
Installa�on posi�onInstalla�on
Case material
Gas contact part material

WeightAS-W-40

AS-W-50

AS-W-80

AS-W-100

AS-W-150

AS-W-200

AS-C-40

AS-C-50

AS-C-80

AS-C-100

AS-C-150

AS-C-200

Ultrasonic Flowmeter

25A

32A
40A
50A
80A
100A
150A
200A
Built-in lithium battery , battery life 10 years (at surrounding temperature of 20℃)(Excluding 1 year of storage period)
Natural gas（AS-W）, Air（AS-C）
0.07 ~ 1.0MPa (AS-W-□-1000BA/5)
0.07 ~ 1.0MPa (AS-W-□-1000BA/5)
0.07 ~ 0.5MPa (AS-W-□-500BA/5）
0.07 ~ 0.5MPa (AS-W-□-500BA/5)
0.07 ~ 0.5MPa (AS-W-□-500BA/5)
0.07 ~ 0.2MPa (AS-W-□-200BA/5）
0.07 ~ 0.2MPa (AS-W-□-200BA/5)
0.07 ~ 0.2MPa (AS-W-□-200BA/5)
0.07 ~ 0.5MPa (AS-W-□-0BA/5）
0.07 ~ 1.0MPa (AS-W-□-0BA/5)
0.07 ~ 1.0MPa (AS-W-□-0BA/5)
0BA：No pressure compensatedExcept EU&UK (Max. 0.15MPa abs)
0BA：No pressure compensated
0BA：No pressure compensated
0 ~ 1.0MPa (AS-C-□-1000BA/5)±0.7 ~ 7±7 ~ 35

±1.3 ~ 13±13 ~ 65

±3 ~ 30±6 ~ 60
±10 ~ 100
±24 ~ 240±40 ~ 400±30 ~ 150
±60 ~ 300
±100 ~ 500±240 ~ 1200
±400 ~ 2000
0.05 m/s or less
±0.1
±0.2
±0.2
±0.4
±0.8
±1.5±3.2±5.7-20 ~ +60℃, 90% RH or lessZero（equivalent to straight tube part）
Accumulated flow volume: 0000000000 (10 digits/m3 or Nm3)
Accumulated flow volume: 00000000.0 (9 digits/m3 or Nm3)
(1) Maximum indication value: ±19999Nm3/h (converted flow rate) (2) Maximum indication value: ±19999m3/h (actual flow rate)(Two decimal places for a value less than 200, one decimal place for a value from 200 to less than 2000, integer only for a value of 2000 or more)
00.0℃ (3 digits)
0000.0kPa (5 digits)
The measurement success rate of ultrasonic measurement (the successful number of ultrasonic measurements in 10 measurements) is indicated in 4 levels.
Open drain output: Unit pulse (forward current), pulse unit: 100,1000,10000 (L/P or NL/P)
RS485 MODBUS/RTU
ISO7005-1 (GB/T9119-2000 PN1.6MPa Flange) equivalent *4Horizontal, verticalIndoor, outdoor (protection level IP 64 or equivalent)
Aluminum alloy
Stainless alloy
Aluminum alloy, engineering plastic
Stainless alloy, engineering plastic
3.5kg
4.2kg
8.4kg
10.4kg14.1kg14kg
21.2kg36.2kgAS-W （ For Natural Gas ）AS- C （ For Air ）±1.6 ~ 16±16 ~ 80

Safe and secure
by gas leakage detection
AS-W(C)-100~200*1. The flow rate measurement range is ±5% RD: Inclusive before “~” and not inclusive after “~” and ±2% RD: Inclusive for both before and after “~”.
*2. When the flow rate is less than 0.25% of the maximum flow rate, the instantaneous flow rate is indicated as 0 m3/h. For the normal conversion type, the low flow cut off value is the normal conversion flow rate corresponding to 0.05 m/s.
*3. Automatically switched in every 4 seconds.
*4. This flowmeter guarantees the flow measurement accuracy with the pipes listed in the right table.
Piping standard
ISO7005-1
EN10208(If you use pipes with the different pipe standard and size not listed in the table, the flowmeter may not satisfy theNominal diameter（mm）
405080100
1502002532
flow measurement accuracy. Consult us in advance if it is considered to use different pipes out of this range.)

Outer diameter（mm）

32

38

48.3

57

88.9

108

159

219.1

Thickness（mm）

3.5

34

3.5

4.5

4

4.5

10

External dimensions

Unit : mm
40A 〜 80A

100A 〜 200A

183

183

H

H

183

H

Model

W

AS-W-25160

272

AS-W-32160

272

AS-W(C)-40

200

297

AS-W(C)-50

220

311

AS-W(C)-80

250

343

AS-W(C)-100

250

377

AS-W(C)-150

300

434

AS-W(C)-200

350

492

106

106

106

25A・32AW

W

AS-W(C)-40~80

Caution regarding to methane
Depending on concentration (%) of methane in natural gas(NG), for each nominal diameter, requirement of theworking pressure condition is provided as described in thebelow table. (Do not use if the working pressure does notsatisfy the conditions below. Also, do not use if there is apossibility that methane concentration may change greatly
after installation so that the conditions below will not besatisfied.)
Size

Methane Concentration(%)

Working pressure(absolute)

99% 〜 100%

250kPa or higher

97% 〜 99%

150kPa or higher

97% or lower

No restriction

200A150AWMeasures gas consumption
at high sensitivity and high precision

AS-W-25,32

98% 〜 100%

100kPa 以上

98% or lower

No restriction* No restric�on for the 100A or smaller models.

○ Conversion table for actual flow rate and standard flow rate (for absolute pressure 0.54 MPa at 30℃)
AS-W-40(40A)

AS-W-50(50A)

AS-W-80(80A)

AS-W-100(100A)

AS-W-150(150A)

AS-W-200(200A)

Maximum

Maximum

Maximum

Maximum

Maximum

Maximum

Actual flow rate (m3/h)

80

150

300

500

1200

2000

Standard flow rate (Nm3/h)

382716

1432

2386

5726

9543

FormulaStandard ﬂow rate (Nm3/h) =Absolute temperature at 20℃(273.15K+20K)
Absolute temperature of working temperature(273.15K+t)×

Absolute pressure of working pressure (P)Absolute pressure at 1 atm(0.10133 MPa)×

Wide rangeability of 1:400
Even small flow is measurable,
so it enables pipe leakage
detection.

Actual ﬂow rate
（m3/h）

Zero pressure loss and zeroenergy loss achieved by noobstacle inside themeasurement tube.
No change of accuracy in longtime use and free frommaintenance.

Technical specifications in this catalog are up-to-date as of March 2023.

Manufactured and Distributed by

Aichi tokei denki co.,ltd.
URL：https://www.aichitokei.net/

1-2-70 Chitose, Atsuta-ku, Nagoya, 456-8691, JapanFor inquires, please contact us.
Overseas Business Division TEL +81-(0)52-661-5150

To Our Customers

Please understand that product specifications may be changed without noticein order to improve performance. We are always happy to provide the latest
catalogs and brochures, and respond to inquiries made to our offices.

1.5

202303-AS_W-000

Temperature and pressure
sensors are installed. Normaland standard conversion
functions are equipped.

Easy-to-read and large-sized
digital display, which is rotatableby 90 degrees on the spot.

6600

Enhanced logging function
Eleven data log items including
timestamp, temperature, pressure,instantaneous flow rate, accumulated
flow rate, etc. can be stored for up to6600 sets. Data acquisition interval canbe set to 5 minutes to 24 hours.

OUTPUT

Remote measurement

LONGLIFE

Runs with a built-in lithium
battery and no necessity ofelectric construction.
battery life 10 years

RS485 output in addition to unit pulses
allows for remote indication andenergy management.

Examples of applications

AS series solved these problems.

Gas
consumption
100EX:1 Flow control and leakage monitoringwith RTU and GIS

CASE1
50

000:00AS-W series

Customer AProblem
06:00

12:00

21:00

00:00
TimeGood,
there isno leakage!

RTU

At their middle supply pressure
site, when natural gas wassupplied, failure that impurities
in the pipes damage therotating parts of existing rotary
meters and turbine meters
often occurred.

CASE2

AS meter does not have any obstacle
inside the measurement tube, soimpurities contained in gas are blown
away to downstream side of AS meter,and do not damage AS meter.
Performance stability of AS meter under
middle pressure supply was also proved.

Turbine flow meter

DamageCustomer BProblem

EX:2 Adaptability under wide changes
in flow volume

EX:3 Space saving and workefficiency-improvement□ No need to prepare
meters separately foreach production siteand canteen.

□ Improvement in space and accuracy by replacingfrom a large-sized diaphragm gas meter at a hotel,
a restaurant, a canteen, etc.

□ 1 piece of AS meter withwide rangeability allows
for covering expansion ofplant equipments.

Gas=□ Wide rangeability enables size down of pipes andequipments, and it contributes to construction
cost reduction and work-efficiency improvement.

Compact andlightweight design!

X1

=X1

X1

AS-W series

Exclusive External
connection cable(standard 5 m)

Connection between power
supply and indicator

Extension
cable

External Cable Connection Diagram

RS485

RTU

Installation method
Make sure to align the central axis of the meter with that of the piping. In order tominimize the deviation of the central axes of the flow meter and piping, please use
the centering collars provided as an accessory. Not using the centering collars leads
to be out of the warranty accuracy.Insert the centering collars into the holes offlange and gasket at the upper stream side diagonally as shown in the figure below.
Upstream side

Connector

Plug

Downstream side

Contact output: Flowpulse (forward current)

White

Communication (+)

Yellow

RS485 power

Red

Unusable

Green

Communication (－)

BlownUnusable

BlueGND

Black

Because the factory used LPG
gas until 2015, a lot of drainsfrom LPG were remaining in thepipes. Rotary meters wereaffected by the drains.

Correct measurement of AS meter is
not affected by residue such as LPG
drains in pipes. Operation status of all
installed AS meters in the factory are ingood condition.

Roots flow meter

Clogging

CASE3

Customer CProblem

After implementation

Gas consumption of themanufacturer, whose products
are mainly for overseas
markets, varies widely depends
on quantities of orders fromoverseas, which changes verymuch due to economic trends.

Wide flow-rate range of AS ultrasonicflow meters enabled accurate
measurement both under small andlarge consumption.

Conditions

90°elbow ·Full-borevalve fully
openedUpstream
Screw connection type
(AS-W-25, 32): 20D or longer
Flange connection type
(AS-W-40, 50, 80, 100,150,200):
10D or longer※1. The main body and GND are electricallycommon. Use an isolated power supply andindicator as required.

AS
Ultrasonic flow meter

Smallconsumption

AS
Ultrasonic flow meter

Large

OK consumption

Downstream
5D orlonger

Please contact us for requirements of measuring othertype of gas and smaller flow-rate, or of meter
installation where straight pipe section cannot besecured. The following product lineup is available.
model UX/UZ
Ultrasonic Flow Meter
for Fuel Gas Management□ No straight pipe section required,

Joining

20D orlonger

wide rangeability, and easy toreplace batteries!

□ City gas, Butane, Propane,
10D orlongerArgon(only for DN40, 50),and Nitrogen can be measured.

Solutions for Houses
20D orlonger

5D orlonger□ Calculation of gas

and water used in houses.

Enlargepipe

Solutions for Industry
Narrowingpipe

10D orlongerOK

Other solutions we offer

10D orlonger※1
Centering collars

AS
Ultrasonic flow meter

After implementation

Piping conditionSystem configuration example

AS
Ultrasonic flow meter

After implementation

Please consult with us if the meter is to be installednear a pressure reducing valve or a flow control valve.

□ Compressed air measurement□ Cooling and coolant water monitoring□ Chemical injection monitoring□ Microstream flow control