OMEGA

FST-221-SPST thermal Dispersion Flow Switches for Liquids

Thermal Dispersion Flow Switches for Liquids

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FST 221 SPST thermal Dispersion Flow Switches for Liquids 13748

 OMEGA™ FST-200 Series flow switches use thermal dispersion technology to create a very accurate and economical method of sensing flow. Monitor fluids from 0.4 to 1.2 specific gravity, 1 to 300 cp, and pulsating flow from 10 to 100 pulses per minute. The sensors incorporate two temperature probes, one of which is heated. The flow of liquid reduces the temperature of the heated probe, decreasing the temperature differential with the non-heated probe. OMEGA’s LVCN-131 and LVCN-141 of controllers can easily be interfaced to perform a variety of control functions.

 
• High Reliability — No Moving Parts
• Very Low Flow Detection–Down to 0.04 FPS Liquids
• Use in 1/8 through 12' Pipe or Tubing
• SPST Relay Standard
Range0.04 to 3 fps (liquids)
Accuracy±5% of setpoint at constant temperature and flowrate
Response Time10 seconds after initial 30 sec warm up
Setpoint Drift with Fluid Temperature0.5% per °C
Voltage Input12-36 Vdc@70 mA
Contact Output Modeselectable, NO or NC states
Fluid Temperature0 to 60°C (32 to 140°F)
Max Fluid Pressure (PP or PVDF)150 psi @ 25°C (77°F)
derated @1.667 psi per °C above 25°C (77°F)
Wetted MaterialsPP and PVDF
Cable Specifications3 m (10 ft)
Dimensions76.2 or 114.3 x 26.7 mm dia. (3.0 or 4.5 x 1.05')
Max Cable Length305 m (1000 ft)

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