No. CP-SS-1782E

Gas Flow Monitor, Model CMG for Butane and Propane

Overview

The CMG Gas Flow Monitor is a flowmeter for measuring the fuel flow rate of gas burners. It incorporates a thermal microflow sensor developed by Azbil Corporation.

The CMG measures the volumetric flow rate under normal conditions * without the need for temperature and pressure compensation and displays the instantaneous flow rate and the amount of total flow. Other functions include alarm contact output, analog output of instantaneous flow rate, and open collector output of totalizer pulse or events.

These functions provide finely tuned air ratio management for individual burners and flow rate management for combus tion equipment.

* The factory default is 0 °C, 101.325 kPa (1 atm).

(The reference temperature can be selected from 5/10/15/20/25 °C in the function settings.)

Features

• This compact, high-precision gas flow monitor has minimal pressure loss, and thus is optimal for burner applications.

Because the direction of the display can be changed, the device can be mounted in any orientation.

• With the digital display of flow rate and Hi, Lo, OVER,

ALARM LED indications, the gas flow rate can be easily measured and managed.

• Analog output of the instantaneous flow rate and scaling of the output are available for flow rate management.

• Display of the instantaneous flow rate and total flow can be switched with one press of a button, facilitating gas usage checking.

• Because this device measures mass flow rate, temperature and pressure compensation is not needed. The reference tempera ture for volumetric flow rate display can be selected, and the pressure conditions can also be changed easily by specifying the gas composition compensation coefficient.

• The self-diagnostic function supports troubleshooting.

Structure

< Excess air ratio >

The amount of air needed for complete combustion of fuel can be theoretically determined, and is referred to as the theoretical quantity of air. However, in actual combustion equipment, the theoretical quantity of air is insufficient for complete combustion.

Therefore, excess air is used in order to sustain stable combustion and minimize heat loss due to exhaust gas, CO, and particulate matter.

Excess air ratio (m) = [Quantity of air used (A)] /

[Theoretical quantity of air for combustion (AO)]

Excess air ratio is generally set at m = 1.1 or higher by burner adjustment. By knowing the amount of deviation in the excess air ratio caused by foreign matter accumulation on the burner and blower filter clogging, the burner can be adjusted to achieve optimum air ratio as well as energy savings.

For the purpose of saving energy, reference and target values for the air ratio for specific types of equipment are determined by the (Japan’s) laws on energy conservation .

Display and calculation unit

Power

Power and output unit

100/200 V AC or 24 V DC

Instantaneous flow rate output (1–5 V or 4–20 mA)

Event output 2 (open collector or totalizer pulse, 4–20 mA output models only)

Event output 1 (relay output)

Sensor circuit

Microflow sensor

Supply power

Filter

Flow direction

Orifice

1

Specifications

Item

Model No.

Connection diameter

Gas type

Material

Measurement range

Propane

Butane

Display range

(see Table 1)

Rated voltage

Propane

Butane

Allowable voltage

Power consumption

Flow rate display method

Allowable ambient temperature, gas temperature

Storage ambient temperature

Ambient humidity

Instantaneous flow rate display accuracy

Description

CMG150

Rc ½

CMG250

Rc 1

CMG400

Rc 1½

Butane* 1 or propane* 2 (depending on the model)

Flow path: aluminum alloy (Rc thread)

Display: PBT+GF 30 %

0.20–2.00 m

0.10–1.00 m

0.00–3.00 m

0.00–1.50 m

3

3

3

3

/h

/h

/h

/h

0.40–4.00

m 3 /h

0.30–3.00

m 3 /h

0.00–6.00

m 3 /h

0.00–4.50

m 3 /h

1.00–10.00

m m m

3

3

3

/h

0.80–8.00

/h

0.00–12.00

/h

0.00–10.00

m 3 /h

2.5–25.0

m 3 /h

2.0–20.0

m

0.0–30.0

m 3 /h

0.0–25.0

m

3

3

/h

/h

5.0–50.0

m m

3

3

/h

4.0–40.0

/h

0.0–55.0

m 3 /h

0.0–45.0

m 3 /h

100/200 V AC or 24 V DC

AC models: 85–110 % of the rated voltage. DC models: ±10 % of the rated voltage

CMG500

2.5–25.0

m m m m

3

3

3

3

/h

2.0–20.0

/h

0.0–30.0

/h

0.0–25.0

/h

Rc 2

5.0–50.0

m 3 /h

4.0–40.0

m 3 /h

0.0–55.0

m 3 /h

0.0–45.0

m 3 /h

AC models: 2 W max., DC models: 5.5 W max.

Volumetric flow rate converted to conditions of 0 °C and 101.325 kPa (1 atm) (5/10/15/20/25 °C can be selected as the reference temperature)

-10 to +60 °C (without freezing)

-20 to +70 °C (without freezing)

At 40 °C, 90 % RH (without condensation)

In the measurement range

(+10 to +40 °C)

±6%RD±1 digit

In the measurement range

(+10 to +40 °C)

±1.5%FS±1 digit [Less than 25% FS]

±6%RD±1 digit [25%FS or more]

Instantaneous flow rate repeatability

Response speed

Instantaneous flow rate output

±1 % rdg. ±1 digit (20 °C)

Sampling cycle: 100 ms, response to a 0 to 100 % FS step input: 1.6 s

1–5 V DC output

Output range: 0 to 200 % of measurement range high limit (changeable by parameter setting)

Accuracy: ±0.5 % FS

Wiring distance: 10 m max.

External load resistance: 10 kΩ min.

-

4–20 mA output

Output range: 0 to 200 % of measurement range high limit (changeable by parameter setting)

Accuracy: ±0.5 % FS

External load resistance: 300 Ω max.

Event output 1

Event output 2

(4–20 mA output models only)

1a contacts (closed when an alarm occurs)

Contact rating: 250 V AC, 30 V DC, 5 A (resistive load)

Mechanical life: 20 million cycles

Electrical life: 100,000 cycles

Output type: NPN open collector output

Load: 30 V, 50 mA max.

When totalizer pulse output is selected

Pulse width: 100 ms ± 20 %

With measurement to 2 digits after the decimal point: select from 0.001 or 0.01 m 3 /pulse

With measurement to 1 digit after the decimal point: select from 0.01 or 0.1 m 3 /pulse

Operating pressure range 100 kPa max.

Pressure resistance 150 kPa max.

Pressure loss * 3

(Measurement range high limit for air)

Straight pipe length

Conduit size

Vibration resistance

Shock resistance

Dielectric strength

G½, 2 pieces

5 m/s 2 max. at 10–60 Hz for 2 hours each in X, Y, and Z directions

500 m/s

Not needed

2

140 Pa

(4 m 3 /h)

215 Pa

(10 m 3 /h)

210 Pa

(30 m

max., 3 times in X, Y, and Z directions

3 /h)

Not needed 15 cm min.

500 Pa

(80 m 3 /h)

10 cm min.

1300 Pa

(150 m 3 /h)

40 cm min.

285 Pa

(80 m 3 /h)

10 cm min.

550 Pa

(150 m 3 /h)

40 cm min.

24 V DC models

Terminal 5 or 6 and flow path: 1500 V AC for 1 min or 1800 V AC for 1 s

AC models

Terminal 1 or 2 and flow path: 1500 V AC for 1 min or 1800 V AC for 1 s

Terminal 3 or 4 and flow path: 1500 V AC for 1 min or 1800 V AC for 1 s

Insulation resistance

Protection rating

Between each terminal and flow path metal: 50 MΩ min. (with 500 V DC megger)

IP54 (JIS C 0920), drip-proof and dust-proof structure

2

Item

Model No.

Mask color

Weight

Applicable standards

(DC models only)

Installation category

Pollution degree

Altitude

Terms: % rdg. : percentage of reading

% FS : percentage of full scale output

Description

Yellow

CMG150

Approx. 850 g

CMG250

Approx. 800 g

CMG400

Approx. 2100 g

CMG500

Approx. 2000 g

EN 61010-1:2010

EN 61326-2-3:2013, EN 61326-1:2013 (to be used in an industrial electromagnetic environment)

During EMC testing, the reading or output may fluctuate by the equivalent of ±8 % FS.

Overvoltage category II

Pollution degree 2

2000 m max.

*1 Butane composition: 75 % butane, 25 % propane

*2 Propane composition: 98 % propane, 2 % butane (liquefied petroleum gas No. 1)

*3 The pressure loss is for air. The pressure loss for other gases can be calculated by multiplying the pressure loss for air by the applicable following specific gravity for the gas.

Butane: 2.09. Propane: 1.55

Ex.: The pressure loss by the CMG150 for propane

Pressure loss for 4 m 3 /h air: 140 Pa

Pressure loss for 2 m 3 /h propane: 140 Pa × 1.55 (specific gravity) × [2 (propane measurement high limit) / 4 (air measurement high limit)] 2 = approx. 54 Pa

Structure

Microflow sensor chip

Filter Installation

If dust, oil mist, or water enters this device, it may cause measurement error or faulty operation.

If a gas that always contains oil mist, such as butane or pro pane, is used, or if it is expected that pipe rust will enter the pipes, make sure to install a filter.

A special filter is available for butane and propane.

Please contact the azbil Group for further details.

Individual CMG model specifications

Piping size

Flow rate range m/h

(normal)

Measurement range

(top)

Display range

(bottom) *1 *2 *3

Straight pipe length for a 90° elbow *4

Item

Model No.

Thread connection

Flange connection

Natural gas (13A)

Air

Upstream side

Downstream side

CMG15

Rc 1/2"

-

0.50 to 4.00

0.00 to 7.00

CMG25

Rc 1"

-

1.00 to 10.00

0.00 to 16.00

3.0 to 30.0

0.0 to 35.0

Specifications

CMG40

Rc 1 1/2"

40A JIS 10K RF

8.0 to 80.0

0.0 to 100.0

15.0 to 150.0

0.0 to 170.0*

CMG50

Rc 2"

50A JIS 10K RF

8.0 to 80.0

0.0 to 100.0

15.0 to 150.0

0.0 to 170.0

Not needed Not needed 15 cm min. 10 cm min. 40 cm min. 10 cm min. 40 cm min.

Not needed Not needed 10 cm min.

5 cm min.

20 cm min.

5 cm min.

20 cm min.

*1 The number of digits displayed after the decimal point for m 3 /h is the same as that shown in the table.

*2 “Normal” indicates the volumetric flow rate (m 3 /h) converted to conditions of 0 °C and 101.325 kPa (1 atm).

*3 The measurement range refers to the indication accuracy-guaranteed instantaneous flow rate range.

*4 Depending on the pipe shape or other devices installed on the piping, a longer straight pipe might be needed. The downstream straight pipe length indicated above is a reference value.

3

Straight Pipe Length Guideline

● For same-diameter piping (inner diameters A and B are the same)

Upstream elbow Downstream elbow

A

See model spec table See model spec table

A

B B

● For different-diameter piping (inner diameters A and B are different by 1 size)

D: Inner diameter of connecting pipe

Upstream expansion (different diameter socket) Downstream reduction (different diameter socket)

15D

A B

Upstream reduction (different diameter socket)

5D

B

A

Downstream expansion (different diameter socket)

10D

A

B

Upstream expansion (expander is used)

10D

A

B

Upstream reduction (reducer is used)

B

10D

A

● Valves (fully opened)

Upstream valve

Ball valve: 10D

5D

B A

Downstream reduction (reducer is used)

5D

B

A

Downstream expansion (expander is used)

5D

B

A

Downstream valve

All valves: 5D

Handling Precautions

• If a governor, filter, or strainer disturbs the flow, please contact the azbil Group for further details.

• Flow control valves, such as butterfly, needle, and globe valves, should be installed downstream of the CMG, at least

5D away from it.

• The required straight pipe length differs depending on the model.

• For air and natural gas at 500 kPa or above or for butane and propane at 50 kPa or above, install the device on a horizontal pipe with the display facing upward, or on a vertical pipe.

• If the display faces in another direction on horizontal piping, the zero point might shift.

4

Model Selection

Propane models

I II III IV V VI VII

I II III IV V VI VII VIII IX X Example: CMG150P002000100

VIII IX X

Description

CMG

15

25

40

50

0

P

002

004

010

025

050

0

1

0

0

0

1

2

Gas flow monitor

15A (½B)

25A (1B)

40A (1½B)

50A (2B)

Rc thread

Propane (98 % propane, 2 % butane)

2 m 3 /h (CMG15)

4 m 3 /h (CMG25)

10 m 3 /h (CMG25)

25 m 3 /h (CMG40, 50)

50 m 3 /h (CMG40, 50)

1–5 V DC output (2, 4, 10 m 3 /h only) *

4−20 mA + Event Output 2 (open collector pulse output)

Low pressure

No communication

24 V DC

100 V AC (50/60 Hz)

200 V AC (50/60 Hz)

00 None

D0 With inspection report

Butane models

I II III IV V VI VII VIII IX X

Description

CMG

15

25

40

50

0

B

001

003

008

020

040

0

1

0

0

* Event Output 2 is not available for 1–5 V DC output models.

0

1

2

Gas flow monitor

15A (½B)

25A (1B)

40A (1½B)

50A (2B)

Rc thread

Butane (75 % butane, 25 % propane)

1 m 3 /h (CMG15)

3 m 3 /h (CMG25)

8 m 3 /h (CMG25)

20 m 3 /h (CMG40, 50)

40 m 3 /h (CMG40, 50)

1–5 V DC output (1, 3, 8 m 3 /h only) *

4−20 mA + Event Output 2 (open collector pulse output)

Low pressure

No communication

24 V DC

100 V AC (50/60 Hz)

200 V AC (50/60 Hz)

00 None

D0 With inspection report

5

Table 1. Measurement range, indication range, and indication accuracy

Propane models

Model No.

CMG150P002

CMG250P004

CMG250P010

CMG40_P025

CMG50_P025

CMG40_P050

CMG50_P050

Instantaneous flow rate measurement range

0.20–2.00 m 3 /h

0.40–4.00 m

1.00–10.00 m

2.5–25.0 m

5.0–50.0 m

3

3

3

/h

/h

/h

3 /h

Indication range

0.00–3.00 m

0.00–6.00 m

3

3

0.00–12.00 m

0.0–30.0 m

0.0–55.0 m

3

3

/h

/h

/h

/h

3 /h

Instantaneous flow rate repeatability within measurement range: ±1 % rdg. ±1 digit

No. of digits after the decimal point

2

1

2

2

1

% rdg.: percentage of reading

% FS: percentage of full scale output

Indication accuracy for instantaneous flow rate within the measurement range

±6 % rdg. ±1 digit (10 to 40 °C)

Butane models

Model No.

CMG150B001

CMG250B003

CMG250B008

CMG40_B020

CMG50_B020

CMG40_B040

CMG50_B040

Instantaneous flow rate measurement range

0.10–1.00 m 3 /h

0.30–3.00 m

0.80–8.00 m

2.0–20.0 m

4.0–40.0 m

3

3

3

3

/h

/h

/h

/h

Indication range

0.00–1.50 m

0.00–4.50 m

3

3

0.00–10.00 m

0.0–25.0 m

0.0–45.0 m

3

3

/h

/h

/h

/h

3 /h

Instantaneous flow rate repeatability within measurement range: ±1 % rdg. ±1 digit

% rdg.: percentage of reading

% FS: percentage of full scale output

No. of digits after the decimal point

Indication accuracy for instantaneous flow rate within the measurement range

±6 % rdg. ±1 digit (10 to 40 °C)

2

1

2

2

1

6

Parameter List

No. Item displayed

1 A.

HI

*1

2

3

A.

A.

H.

LO

H

*2 y

Name

Instantaneous flow rate upper limit alarm

Instantaneous flow rate upper limit alarm hysteresis

Instantaneous flow rate lower limit alarm

Initial value

(Measurement range upper limit) m 3 /h (normal)

(2 % of measurement range upper limit) m 3 /h (normal)

(Measurement range lower limit) m 3 /h (normal)

Setting range

(0–400 % of measurement range upper limit) m 3 /h (normal)

(0–200 % of measurement range upper limit) m 3 /h (normal)

(0–200 % of measurement range upper limit) m 3 /h (normal)

Remarks

The alarm detection condition must be selected in function setting

C-02

.

4

5

6

7

A.

A.

E.

E.

L .

dL

SP.

SP.

H y y

L

H

Instantaneous flow rate lower limit alarm hysteresis

Delay timing for instantaneous flow rate alarm judgment

Total flow event setting

(last 4 digits)

Total flow event setting

(first 4 digits)

(2 % of measurement range upper limit) m 3 /h (normal)

60.0 s

0 m 3

(0–200 % of measurement range upper limit) m 3 /h (normal)

0.0 to 999.9 s

0 to 99,999,999 m 3 The setting is valid only when total flow event output is selected in func tion setting

C-03

or

C-04

.

-

8

E.

C.

dL

Total flow reset delay time

10.0 s 0.0 to 999.9 s The setting is valid only if function setting

C-06

is set for automatic reset after the total flow reset delay time.

9

10

11

12 bIAS

Out.H

Out.

GAS.

L

C

Instantaneous flow rate bias

(PV bias)

Instantaneous flow rate output

5 V (20 mA) scaling

Instantaneous flow rate output

1 V (4 mA) scaling

Gas composition compensation coefficient

0 m 3 /h

(Measurement range upper limit) m 3 /h (normal)

0 m 3 /h

1.000

(-20 to +20 % of measurement range upper limit) m 3 /h (normal)

(0–400 % of measurement range upper limit) m 3 /h (normal)

(0–200 % of measurement range upper limit) m 3 /h (normal)

0.100 to 4.000

Note “Normal” indicates the volumetric flow rate (m 3 /h) converted to conditions of 0 °C and 101.325 kPa (1 atm).

*1 Specify a flow rate that is lower than the display range upper limit. An alarm will not be issued if the upper limit value or higher is set.

*2 If “Lower limit alarm 1” is selected for function setting

C-02

, if the flow rate is lower than the measurement range lower limit, an alarm will not be issued even if the flow rate is below the lower limit alarm setting.

7

Function Settings

Item displayed

C-0 1

Key lock

Name

C-02

C-03

C-0 4

C-05

C-06

C-0 7

C-08

Settings and description

Conditions for flow rate alarm detection

Event output 1 (relay) function

0: OFF

1: ON

0: No alarm detection

1: Upper limit alarm detection only

2: Lower limit alarm 1 detection only

3: Upper limit alarm and lower limit alarm 1 detection

4: Lower limit alarm 2 detection only

5: Upper limit alarm and lower limit alarm 2 detection

0: Not used (always OFF)

1: ON when an upper limit alarm occurs

2: ON when a lower limit alarm occurs

3: ON when upper or lower limit alarm occurs

4. ON when a total flow event occurs

Event output 2 (open collector) function

0: Not used (always OFF)

1: ON when an upper limit alarm occurs

2: ON when a lower limit alarm occurs

3: ON when upper or lower limit alarm occurs

4. ON when a total flow event occurs

5: Totalizer pulse output

0: Reset by pressing the [RESET] key Flow rate alarm reset method 1: Reset by pressing the [RESET] key or automatic reset when the flow rate returns to normal

Total flow reset method 0: Reset disabled

1: Reset by pressing the [RESET] key

2: Automatic reset after the total flow reset delay time when a total flow event occurs

3: Automatic reset after the total flow reset delay time when the [RESET] key is pressed

Lifetime total flow reset method or a total flow event occurs

0: Reset disabled

1: Reset by pressing the [RESET] key

Reference temperature 0: 0 °C, 101.325 kPa (1 atm)

1: 5 °C, 101.325 kPa (1 atm)

2: 10 °C, 101.325 kPa (1 atm)

3: 15 °C, 101.325 kPa (1 atm)

4: 20 °C, 101.325 kPa (1 atm)

5: 25 °C, 101.325 kPa (1 atm)

C-09

Pulse rate 2 digits after the decimal point

0 0.001 m 3 /pulse

1 0.01 m 3 /pulse

2 0.1 m 3 /pulse

3 0.1 m 3 /pulse

1 digit after the decimal point

0.01 m 3 /pulse

0.01 m 3 /pulse

0.1 m 3 /pulse

1 m 3 /pulse

Initial value

0

0

Remarks

The key lock can be turned off even when the keys are locked.

The flow rate that triggers an alarm can be specified in parameter setup mode.

Lower limit alarm 1:

Alarm will not occur if the flow rate is be low the measurement range lower limit.

Lower limit alarm 2:

Alarm will occur if the flow rate is below the measurement range lower limit.

3

5

0

1

0

0

1

This function is available only for models with event outputs.

The total flow is reset when the lifetime total flow is reset.

The reference temperature can be switched.

The pulse rate differs depending on whether the measurement range includes

2 digits after the decimal point or 1 digit after the decimal point.

8

External Dimensions

● CMG150/250

ALARM Hi Lo

. . . .

OVER m 3

DISP m 3 /h

Gas Flow Monitor

CMG

G ½ thread hole, depth: 10 min.

Mask

● CMG400/500

CMG250 Rc1

CMG150 Rc1/2

2-HE×46

0

-1.5

25

100

25

ALARM Hi Lo

. . . .

OVER m 3

DISP m 3 /h

Gas Flow Monitor CMG

G ½ thread hole, depth: 10 min.

Mask

2-HE×7

5

−

0

1.5

CMG500 Rc2

CMG400 Rc1 1 /

2

27

170

27

9

(Unit: mm)

Wiring Diagram

• AC model

Internal circuit

Terminal 1: AC

CN1

• DC model

Internal circuit

Terminal 1: 24 V DC

Terminal 2: COM

CN1

+

−

Terminal 2: AC

Terminal 3: RELAY

Terminal 3: OUT (+)

Load

1–5 V or 4–20 mA output

Terminal 4: RELAY

Load

Relay output

Terminal 4: EVENT2

Terminal 5: COM

CN200 Open collector output

(4–20 mA output models only)

Terminal 6: OUT (+)

Terminal 7: EVENT

Load

1–5 V or 4–20 mA output

Terminal 5: RELAY

Load

Terminal 6: RELAY

Open collector output

(4–20 mA output models only)

Relay output

Terminal

No.

1

2

5

6

3

4

7

AC

AC

Signal name

RELAY

RELAY

COM

OUT

EVENT

Description

Power

Power

Event output 1, contact output

Event output 1, contact output

Common

Analog output (+)

Event output 2, NPN open collector, totalizer pulse

Terminal

No.

1

2

3

4

5

6

Signal name

24 V DC

COM

OUT

EVENT2

RELAY

RELAY

Description

Power

Common

Analog output (+)

Event output 2, NPN open collector, totalizer pulse

Event output 1, contact output

Event output 1, contact output

Pressure Loss

The following pressure loss is for air. To calculate the pressure loss, multiply the pressure loss for air by 1.55 for propane and by 2.09 for butane. In the case of a gas mixture such as propane air, multiply the pressure loss for air by the specific gravity of the gas.

• CMG150P002, CMG150B001 • CMG250P004, CMG250B003

Atmospheric pressure

50 kPa

100 kPa

600 600

500

400

300

200

100

0

0 1 2 3 4

Flow rate [m 3 /h (normal)]

5

• CMG250P010, CMG250B008

350

300

250

200

150

100

50

0

0 5 10 15 20

Flow rate [m 3 /h (normal)]

25

6

30

500

400

300

200

100

7

0

0 2 4 6 8 10

Flow rate [m 3 /h (normal)]

35

10

• CMG400P025, CMG400B020

900

800

700

600

500

400

300

200

100

0

0 10 20 30 40 50 60

Flow rate [m 3 /h (normal)]

70

12

80

14 16

90 100

• CMG400P050, CMG400B040

1800

1600

1400

1200

1000

800

600

400

200

0

0 20 40 60 80 100

Flow rate [m 3 /h (normal)]

120

• CMG500P050, CMG500B040

800

700

600

500

400

300

200

100

0

0 20 40 60 80 100

Flow rate [m 3 /h (normal)]

120

140 160

140 160

• CMG500P025, CMG500B020

500

200

150

100

50

0

0

450

400

350

300

250

10 20 30 40 50 60

Flow rate [m 3 /h (normal)]

70 80 90 100

Instructions for Proper Use

1. Install this device upstream of the safety shutoff valve. If air should enter the piping, and the sensor makes a spark due to some cause such as lightning discharge when an explosive gas mixture is present, an explosion may occur inside the pipe.

The device is protected from excess voltage or power short-circuit by an internal safety circuit and fuse.

2. Take necessary countermeasures with the instrumentation to prevent occurrence of backfire and to avoid any effect on the device even if backfiring should occur.

Pressure increase or fire in the pipes caused by the backfire of the burner could damage the device.

3. Each model is designed for specific gases. Do not use the device for a fluid other than the gases specified for that model. If this device is used for a gas with an ignition temperature lower than the specified gases, and if air should enter the piping so that there is an explosive gas mixture, the heating element in the sensor may cause an explosion inside the piping.

4. If there is a pulsating flow in the piping, there may be an error in the measurements of this device. Do not install the device where there is pulsation, regardless of the model, gas type, supply gas pressure, or installation method. Please contact the azbil Group for further details.

Pulsation occurs in:

1) A 500 mm or longer flexible pipe of any material with an accordion-shape inner surface

Note that flexible piping with a smooth inner surface (e.g., a rubber hose) does not cause pulsation.

2) Piping on which a reciprocating or rotary type gas booster or a flowmeter with rotary motion such as a Roots meter is installed

5. For rusted piping, or when measuring a gas containing dust, etc., install a strainer upstream of the device to prevent foreign matter from entering. Foreign matter can cause faulty operation.

6. If the device is used outdoors, protection from direct sunlight and rain is needed.

7. Install this device in a place without vibration. Gas flow in the flow path caused by vibration may result in erroneous readings.

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Please read “Terms and Conditions” from the following URL before ordering and use.

https://www.azbil.com/products/factory/order.html

Specifications are subject to change without notice.

1-12-2 Kawana, Fujisawa

Kanagawa 251-8522 Japan https://www.azbil.com/

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1st edition: Nov. 2017

3rd edition: Mar. 2021

No part of this publication may be reproduced or duplicated without the prior written permission of Azbil Corporation.