Flow Switch

Thermo-Flo ™ Liquid & Gas Flow Switch



Offered in liquid and gas configurations for low-flow detection, the general purpose flow switch is a great choice for a diverse range of relatively clean, non-coating media. Liquid examples include deionized water and sulfuric acid. Gas examples include nitrogen and scrubber exhaust fumes. The 1A relay provides a reliable switch interface with remote devices such as a PLC, SCADA or alarm. The short sensor is intended for use in pipe or ducting from 1/2” to 11/2”; the long sensor is applied in 2” and up. The liquid switch set point may be adjusted from .04 to 3 fps, and the gas switch from 1 to 90 fps.



 Adjustable set point with LED for flow or no-flow status indication

 Solid state sensor is not damaged by over-ranging flow velocities

Set Point

The clear adjustment knob doubles as an LED to indicate the flow status.


 Set point range:
FT10: 0.04 to 3 fps (.012 to 0.91 mps)
GT10: 1 to 90 fps (0.3 to 27 mps)
 Factory set point:
FT10: 0.2 fps (.06 mps)
GT10: 10 fps (3 mps)
±0.5% of set point @ fixed temperature
 Response time 1-10 seconds
 Set point adjust Potentiometer
 Supply voltage 12-36 VDC
 Consumption 70 mA maximum
 Contact type (1) SPST relay
 Contact rating 60 VA
 Contact output Selectable NO/NC
 Process temperature
F: 32° to 140°
C: 0° to 60°
 Electronics temperature
F: -40° to 140°
C: -40° to 60°
 Pressure 150 psi (10 bar) @ 25°C, derated @ 1.667psi (.113 bar) per °C above 25° C
 Sensor rating NEMA 4X (IP65)
 Sensor material

1__5: PP-Ryton®

5__5: PVDF

 Cable jacket mat

1__5: PP

5__5: PFA

 Cable type 4-conductor, #22 AWG (shielded)
 Cable length

Standard: 10' (3m)

Special order: 25' (7.6m) or 50' (15.2m)

 Process mount 3/4" NPT (3/4" G / Rp)
 Mount. gasket Viton®
 Classification General purpose
 CE compliance

EN 61326 EMC

EN 61010-1 safety



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