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Thermal Gas Mass Flowmeter
  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.

1. introduction

  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 actual process values whilst the heater is maintained ata 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.

  Due to the sensor temperature is always 30℃ higher than the medium temperature (environment temperature), and the meter adopts method of constant differential temperature, therefore the meter do not need to do temperature and pressure compensation in principle.

2. Feature

  2.1 Measuring the mass flow or volume flow of gas.

  2.2 Do not need to do temperature and pressure compensation in principle with accuratemeasurement and easy operation.

  2.3 Wide range: 0.5Nm/s~100Nm/s for gas. The meter also can be used for gas leakdetection

  2.4 Good vibration resistance and long service life. No moving parts and pressure sensorin transducer, no vibration

  influence on the measurement accuracy.Easy installation and maintenance. If the conditions on site are permissible, the metercan achieve a hot-tapped installation and maintenance. (Special order ofcustom-made)

  2.5 Digital design, high accuracy and stability

  2.6 Configuring with RS485 or HART interface to realize factory automation and integration

3. Parameters

Description Specifications
Measuring Medium Various gases (Except the acetylene)
Pipe Size DN10~DN4000mm
Velocity 0.1~100 Nm/s
Accuracy ±1~2.5%
Working Temperature Sensor: -40℃~+220℃
Transmitter: -20℃~+45℃
Working Pressure Insertion Sensor: medium pressure≤ 1.6MPa
Flanged Sensor: medium pressure≤ 1.6MPa
Special pressure please contact us
Power Supply Compact type: 24VDC or 220VAC, Power consumption ≤18W
Remote type: 220VAC, Power consumption ≤19W
Response Time 1s
Output 4-20mA (optoelectronic isolation, maximum load 500Ω), Pulse,
RS485 (optoelectronic isolation) and HART
Alarm Output 1-2 line Relay, Normally Open state, 10A/220V/AC or 5A/30V/DC
Sensor Type Standard Insertion, Hot-tapped Insertion and Flanged
Construction Compact and Remote 


 4、Installation Position

  4.1 Thermal meters require a fully developed flow profile as a prerequisite for correct flow measurement. For this reason, please note the following points when installing the device.

  4.2 Observe the recommended inlet and outlet requirements.

  4.3 Good engineering practice is necessary for the associated pipe work and installation.

  4.4 Ensure correct alignment and orientation of the sensor.

  4.5 Take measures to reduce or avoid condensation (e.g. install a condensation trap, thermal insulation, etc.).

  4.6 The maximum permitted ambient temperatures and the medium temperature range must be observed.

  4.7 Install the transmitter in a shaded location or use a protective sun shield.

  4.8 For mechanical reasons, and in order to protect the pipe, it is advisable to support heavy sensors.

  4.9 No installation in where large vibration exists

  4.10 No exposure in the environment containing a lot of corrosive gas

  4.11 No sharing power supply with frequency converter, electric welding machine and other machines which can make

  power-line interference. If necessary, please add power conditioner for transmitter power supply.


  Dimensions of standard insertion sensor:


The dimensions of flanged sensor:

PN1.6Mpa Plane and surface plate flat welding steel pipe flanges (Unit: mm)
                                                                                        Screw   Thread

15 95 65 4×14 M12 46 2 14 280
20 105 75 4×14 M12 56 2 16 280
25 115 85 4×14 M12 65 2 16 280
32 140 100 4×18 M16 76 2 18 350
40 150 110 4×18 M16 84 2 18 350
50 165 125 4×18 M16 99 2 20 350
65 185 145 4×18 M16 118 2 20 400
80 200 160 8×18 M16 132 2 20 400
100 220 180 8×18 M16 156 2 22 500

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