Thermal Flow Switch (Electronic Flow Sensor with Visual LED Indicator)

Description

This Thermal Flow Meter is used to measure and monitor the liquid flow state, with LED to display the flow condition and sent alarm signal. The flow set point is adjustable by the user directly, No pressure loss, and stabitly with sensitive performance. It could anti water scale.

1. Measure Range: 1cm/s ~ **0cm/s(Water); 3cm/s ~ **0cm/s (Oil); 0~*0m/s(Gas) 

2. Power Supply: DC*4V,

3. Output: Relay; 3 wire NPN; 3 wire PNP; Replay; ( 4~*0mA need higher price) 

4. Working Temperature: **5C ~ *0C 

5. Max Pressure: **0bar *0Mpa 

6. Connection: G1/2” 

7. Protect Grade: IP*7 










The flow switches feature thermal dispersion technology in which the temperature difference is greatest in a no-flow condition and decreases as flow increases, cooling the heated RTD. Changes in flow velocity directly affect the extent to which heat dissipates and, in turn, the magnitude of the temperature difference between the RTDs. 
  
An electronic control circuit converts the RTD temperature difference into a DC voltage signal. Both of these signals are provided at output terminals and are used to drive two adjustable-setpoint alarm circuits. Both alarms are independently field configurable for flow, liquid level/interface or temperature operation.