CAT.No.CBM201E-6

High-accuracy
MASS FLOW MONITORCity Gas Measurement■ GENERAL■ FEATURES

Here is a low-cost flowmeter developed by OVAL
for city gas measurement and control.
Operating on the thermal dispersion principle, it
directly measures mass flow without the need fortemperature and pressure corrections.
From an energy saving point of view, we see today
an ever-increasing demand for city gas flow control
applications in furnaces, boilers, air conditioning
equipment and the like.
OVAL is committed to supply the market withproducts that are accurate, cost effective, and oflong life.

● Long life and simple design thanks

to the absence of moving parts.
● As no vane wheel is used, measurement error due to inertia rotation isnot present.
● Broad flow range and high accuracy.
● Temperature and pressure compensation is not required.

High-accuracy MASS FLOW MONITOR■ GENERAL SPECIFICATIONS
Item

Description

Acceptable fluids

City gas (13A), air, and nitrogen

Nominal size

25mm

40mm

Flow range (※1)

40 to 600L/min (normal)

Process connection

Rc1 (female) or
25A JIS 10K RF flange

50mm

80mm

167 to 2500L/min (normal)
Rc1・1/2 (female) or
40A JIS 10K RF flange

500 to 7500L/min (normal)

Rc2 (female) or
50A JIS 10K RF flange

80A JIS 10K RF flange

Fluid temperature

0 to 60 ℃

Ambient temperature

0 to 60 ℃ (non-condensing)

Pressure range

0 to 0.7 MPa (Option: 0.98MPa)

Linearity (reproducibility incl.)±1% of full scale or better

Temperature characteristics±0.1%/℃ of full scale or better

Pressure characteristics

City gas: ±0.5% of full scale/0.1MPa Air and nitrogen: ±0.3% of full scale/0.1MPa

Pressure loss

City gas: 1.7kPa max. Air and nitrogen: 2.1kPa max.

Effect of orientation±0.5% of full scale max. (Standard orientation: Horizontal with display up)

Req′d straight pipe length

Inlet side: 7D min. Outlet side: Not specified

Major parts materials

Meter body: SCS13A (lost-wax)
Process connection: SCS13A (lost-wax)
Sensor: SUS316

Display

7-segment 8-digit LED (backlit and measuring units indicated) Display is rotatable in 90°increments.
・Instant flowrate〔m3/h（normal）〕〔L/min（normal）〕,3
・Resettable total, grand total〔m（normal）〕
・Yen equivalent (grand total, instant flowrate, resettable total)
・LED×2 points (Lights up in alarming conditions.)

Output (※2)

Flow pulse (Compensation pulse, open collector output, pulse width is adjustable from 1 to 240 ms)
Flowrate analog (4 to 20mA DC) Alarm (2 points, open collector output)

Power source

24V DC±10% 100mA max. (Excl. analog output 4 to 20 mA)

Cable

4-conductor shielded cable with connector (Outer dim. 6 mm), 3m: Supplied with product code showing “With cable”.

Enclosure rating

Non-explosionproof and indoor use (IP65) (※3)

0 to 0.7 MPa

4kPa max.

Display: Mixed resin consisting of PC (polycarbonate) and PBT (polyethylene terephthalate)
Transmitter housing: PBT (polybutylene terephthalate)
O-rings: Viton※1: Flowrate in (normal) indicates the value converted at 0℃ and 1 atm.
※2: Optional two points can be selected for output.
※3: Transmitter case complies with IP65. However, as gas-vent hole is provided between transmitter and monitor body (for preventing entry of gas
into the transmitter), entry of water could cause effect on the accuracy. Instrumental error due to entry of water is not covered by the warranty.

■ OUTLINE DIMENSIONS● Flange connection type

● City Gas MASS FLOW MONITOR (Nom. size 80A)

Alarm indictors (red LEDs)

7-segment, 8-digit
backlighted LCD(meas. unit indicated)

Alarm indictors (red LEDs)

Pushbuttons

Pushbuttons

Top cover(PC+PBT)Transmitter
housing (PBT)
CB

Backlighted LCD

3m with cable

Top cover (PC+PBT)
JIS10K RF 80A flange

85
φ1220

A

127.5

H

Transmitter housing (PBT)

HABC

Weight (※2)

25mm

15262.5

89.5

25A JIS10K RF flange

5.8kg

40mm171.5

70101.5

40A JIS10K RF flange

7.6kg

50mm

17977.5

101.5

50A JIS10K RF flange

9 kg（92.5）

220
Nom. size

BodyFlange※2：Cable (3 meters long) incl.

Weight : 16kg
※ : Cable (3 meters long) incl.

300● Screw-in connection type

■ LCD DISPLAY

BC

A

E

H

Accumulated total Instant. flowrate Instant. flowrate Resettable total
33m（normal）
m3/h（normal） L /min（normal） m（normal）

L

Resettable total（Yen converted）

D

Instant flowrate（Yen/h）Nom. size

LH

A

B

C

DE

Weight (※2)

25mm

18011929.5

89.5

Rc1 (female)

71

59

3.3kg

40mm

180

143

41.5

101.5 Rc1・1/2 (female)
101.5 Rc2 (female)

83

83

4.3kg

NOTES :

83

83

4.7kg

1. Upon depression of the front panel button (14341.5
50mm 200※2：Cable (3 meters long) incl.

※※

Accumulated total（Yen converted）※), the LCD screen scrolls through variables.

2.When Yen conversion factor is set to zero, variables marked ※ are not shown.

The specification as of Feb., 2013 is stated in this catalog. Specifications and design are subject to change without notice.

3-10-8 Kamiochiai, shinjuku-ku, Tokyo 161-8508
Phone: 81-3-3360-5121 FAX: 81-3-3365-8605

http://www.oval.co.jp0503 1302 − − − − S