TFM83 Thermal mass gas flow meter

Introduction

The principle is that a fluid flowing past a heated temperature sensor removes a known quantity of heat as it passes. In a thermal flowmeter, the fluid has to pass two temperature sensors. One sensor obtains a reference value by measuring the actual process temperature. The second sensor is a heating element and it receives precisely as much energy as is needed to compensate for dispersed heat and maintain a precisely defined temperature difference.

The higher the mass flow past the heated temperature sensor, the more heat is dissipated and the more power has to be input to the element to maintain the temperature difference.

Heating current, therefore, is a measure of the mass flow of the gas.

 

Insert type

Pipe type

Medium

Single gas ( except acetylene gas) or mixed gas of fixed

Pipe size

DN80-6000mm

DN15-2000mm

Velocity

0.1Nm/s~100Nm/s ( standard working condition 20 ℃101.33Kpa)

Accuracy

+1%

Medium temperature

-40~200℃

Pressure

2.5Mpa

4.0Mpa

Power supply

AC220V or DC24V for integral converter and AC220V for split converter.

Response time

≦1s

Signal output

4~20mA RS-485,Modbus 

Display

Instantaneous flow, mass flow , volume flow , cumulative flow ,Beijing time, running time.

Sensor IP code

IP68

Converter IP code

IP67 for integral type

IP 65 for split hanging type

IP 52 for split box type

Explosion proof degrade

Exd IΙ CT 4