Thermal dispersion gas or liquid flow switch


Thermal dispersion flow switch is a precise flow sensing device, whose movement principle is heat diffusion. The probe consists of two temperature sensors. One sensor measures the temperature of the fluid when the probe is immersed. The other sensor is heated by a constant power.

This creates a temperature difference between two sensors. Temperature difference is an inverse ratio to the flow velocity. The probe and housing are made by stainless steel or engineering plastic. Since the device is without moving parts, therefore there is no wear and tear problem.


Electric Enclosure    : Aluminum

Wetted part :  S.S. 316

Flow rate     : Liquid0 to 3 m/s, Gas0 to 30m/s

Output         : Relay, 220V AC, 16 A

Power supply           :  24v dc/0.5 A

Power consumption : less than 150 mA

Pressure Limit          : 10 bar

Temperature limit     : 0 to 80 deg c,                               

Process connection : M20*1.5

Weight                      : 1 kg            

Programing through keyboard : alarm value,

High/low alarm, delay time, zero value,

span value, damping factor

Certification :

Explosion proof    : EXD IIC T6 Gb, Certificate no : CCRI 17, 1295,

Safety Certificate : Class : SIL-3, Certificate No:  0p191008.skscq27

Protection             : IP 66

Preheat time: less than 3 Min

Response time : less than 5 second

Precision  : batter than 5%


Aplication :
Air/Gas-liquid dual-purpose type, can be widely used in industrial automation / mechanical equipment/
air compression industry / refrigeration and air conditioning,
Industrial applications in water-cooled welding machines, laser equipment cooling systems, vacuum
coating machines, electric furnaces, polysilicon ingot furnaces, etc. .


Additional information

Weight 2 kg