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Thermal Mass Flow Meter

  • Size:DN15-DN200
  • Flow Range:0.3~3600 m³/h
  • Normal Pressure:≤ 1.6 MPa
  • Accuracy:±1~2.5%
  • Velocity:0.1~Nm/s
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Principle

Thermal gas mass flow meter is designed on the basis of thermal dispersion, and adopts method of constant differential temperature to measuring gas flow. It has advantages of small size, easy installation, high reliability and high accuracy, etc.
The meter contains two platinum resistance temperature sensors. The thermal principle operates by monitoring the cooling effect of a gas stream as it passes over a heated sensor. Gas flowing through the sensing section passes over two sensors one of which is used conventionally as a temperature sensor, whilst the other is used as a heater. The temperature sensor monitors the actal process values whilst the heater is maintained at a constant differential temperature above this by varying the power consumed by the sensor. The greater the gas velocity, the greater the cooling effect and power required to maintain the differential temperature. The measured heater power is therefore a measure of the gas mass flow rate.

Feature

  Measuring the mass flow or volume flow of gas
♦  Do not need to do temperature and pressure compensation in principle with accurate measurement and easy operation.
♦  Wide range: 0.5Nm/s~100Nm/s for gas. The meter also can be used for gas leak detection
♦  Good vibration resistance and long service life. No moving parts and pressure sensor in transducer, no vibration influence on the measurement accuracy.
♦  Easy installation and maintenance. If the conditions on site are permissible, the meter can achieve a hot-tapped installation and maintenance. (Special order of custom-made)
♦  Digital design, high accuracy and stability
♦  Configuring with RS485 or HART interface to realize factory automation and integration
 




 

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Thermal Mass Flow Meter Specification


Size

DN80-DN4000 (Insertion), DN10-DN2000 (Pipe)

Medium

 Gas (except acetylene)

Velocity

0.5~100 Nm/s (20℃、101.33KPA)

Accuracy

±1% of read (Pipe), ±2.5% of read (Insertion)

Working Temperature

-40℃~+220  (Sensor),  -20℃~+45 (Transmitter)

Working Pressure

Insertion ≤2.5 MPa, Pipe ≤4.0 MPa

Response

1s

Signal Output

Pulse,4-20mA (optoelectronic isolation, maximum load 500Ω)

Communication

RS485 (optoelectronic isolation), HART

Pipe Material

Carbon Steel, Stainless Steel

Sensor Housing Material

SS304 or SS316

Sensor Type  

Standard Insertion, Hot-tapped Insertion,Flanged

Alarm Output

1-2 line Relay, Normally Open state, 10A/220V/AC or 5A/30V/DC

Protection Grade

 IP65

Sensor Material

Stainless steel,Carbon Steel,

Power Supply

Compact type: 24VDC or 220VAC, Power consumption ≤18W
Remote type: 220VAC, Power consumption ≤19W

Display

4 lines LCD,Mass flow, Volume flow in standard condition, Flow totalizer, Date and Time, Working time, and Velocity, etc

 

  Thermal Mass Flow Meter Selection Model

Model

QTMF

X

X

X

X

X

X

X

Caliber

DN10-DN4000

 

 

 

 

 

 

 

 

 

Structure

Compact

C

 

 

 

 

 

 

 

Remote

R

 

 

 

 

 

 

Senor type

Insertion

I

 

 

 

 

 

 

Flange

F

 

 

 

 

 

 

Clamp

C

 

 

 

 

 

 

Screw/Thread

S

 

 

 

 

 

Material

SS304

304

 

 

 

 

 

SS316

316

 

 

 

 

Pressure

1.6Mpa

16

 

 

 

 

2.5Mpa

25

 

 

 

 

4.0Mpa

40

 

 

 

Temperature

-40-200

T1

 

 

 

-40-450

T2

 

 

Power Supply

AC85~250V

AC

 

 

DC20V~36V

DC

 

Signal Output

4-20mA+Pulse+RS485

RS

 

4-20mA+Pulse+HART

HT

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