FLN-300 Split type Thermal Gas Mass Flow meter with cable and LCD

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  • 1 - 9 Sets
  • 10 - 99 Sets
  • >=100 Sets
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Quick Details
Place of Origin:
Shaanxi, China
Brand Name:
Model Number:
Power supply:
Carbon Steel/ stainless steel
Integral/insertion type
LCD Digital
Pipe DN:
Flow rate:
Supply Ability
Supply Ability:
100000 Set/Sets per Month
Packaging & Delivery
Packaging Details
carton box or plywood box
Xi'an, Tianjin, Beijing, Qingdao
Lead Time :
5-7 working days after received customer's payment

Thermal Gas Mass Flowmeter

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.


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



Measuring Medium

Various gases (Except the acetylene)

Pipe Size


Flow range

0.1~100 Nm/s



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



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


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


Dimensions of hot-tapped insertion sensor:


The dimensions of flanged sensor:

Living products show:

Packaging show:

A corner of workshop:

Living examples show:


Maybe we can not sure our price is the lowest, but we can sure our quality!
You can enjoy 18 months quality assurance after shippment and 100% REFUND if bad  quality!
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Above price only reference price! pls contact us to get exact PRICEPACKAGING and  DELIVERY and DISCOUNT!
Xi'an Flowline Instrument Co.,Ltd
Tel: 0086-15249270593/13186196967
Skype: yvette8445
WhatsAPP: 15249270593
Ads: No. 138 Jingwei Road, Gaoling District, Xi'an City, China
Door to door delivery:
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