Thermal Flow Switch

FST-221 Thermal Flow Switch for Liquids

OMEGA FST-200 Series  Thermal Flow Switch uses 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 controllers can easily be interfaced to perform a variety of control functions.

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Features

  • 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

Applications

  • Pump & compressor monitoring
  • Air proving in HVAC systems
  • Engine monitoring
  • Machine tools
  • Hydraulic power units
  • Mobile hydraulics
  • Medical equipment
  • Irrigation systems
  • General industrial applications

Specifications

  • Range: 0.04 to 3 fps (liquids)
  • Accuracy: ±5% of setpoint at constant temperature and flowrate
  • Response time: 10 seconds after initial 30 sec warm up
  • Setpoint Drift with Fluid Temperature: 0.5% per °C
  • Voltage Input: 12-36 Vdc@70 mA
  • Contact Output Mode: selectable, NO or NC states
  • Fluid Temperature: 0 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 Materials: PP and PVDF
  • Cable Specifications: 3 m (10 ft)
  • Max Cable Length: 305 m (1000 ft)
  • Dimensions: 76.2 or 114.3 x 26.7 mm dia. (3.0 or 4.5 x 1.05′)

 

 

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