SERIES FST 200

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FST200- SERIES THERMAL DISPERSION FLOW SWITCHES FOR LIQUIDS

FST200- SERIES THERMAL DISPERSION FLOW SWITCHES FOR LIQUIDS

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.

FST200- SERIES THERMAL DISPERSION FLOW SWITCHES FOR LIQUIDS

Offered in liquid and gas sensor types, the general purpose flow switch provides reliable low or no‐flow detection of relatively clean, non‐coating media with one 1A relay output. Liquid examples in clued water and  acetic acid. Available in Polypropylene‐PPS or PVDF, the short flow sensor is used in pipe or ducting from ½” to 1‐1/2”, and the long flow sensor is used in 2” and up.

The flow switch set point may be adjusted from 0.,04 to 3 fps in liquids or 1 to 90 fps in gases as a low‐flow alarm. The flow sensor is best applied in applications with relatively constant temperatures.

Technical Sheets

Instruction Manual
Catalog Page

Specifications

FST200- SERIES THERMAL DISPERSION FLOW SWITCHES FOR LIQUIDS

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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