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Thermal Dispersion
Flow swiTches For liquiDs
FST-200 Series
FST-221-SPST
shown actual size.
U High Reliability—
No Moving Parts
U Very Low Flow
Detection–Down to
0.04 FPS Liquids
U Use in 1⁄8 to
12" Pipe or Tubing
U SPST Relay Standard
U Excellent for Pump
and Valve Monitoring
of Critical Flows
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
Series of controllers can easily be
interfaced to perform a variety of
control functions.
SPECIFICATIONS
Range: 0.04 to 3 fps (liquids)
Accuracy: ±5% of setpoint at constant
temperature and flowrate
Response Time: 10 sec after initial
30 sec warm up
Setpoint Drift With Fluid
Temperature: 0.5% per °C
Voltage Input: 12 to 36 Vdc @ 70 mA
Contact Output Mode:
Selectable, NO or NC states
Fluid Temperature: 0 to 60°C
(32 to 140°F)
Maximum 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')
Maximum Cable Length: 305 m (1000')
Dimensions:
76.2 or 114.3 L x 26.7 mm diameter
(3.0 or 4.5 x 1.05")
To Order
Use With
Model No. Description Material Size Pipe Size
FST-211-SPST Thermal dispersion PP/ 3.0 x ³⁄₄ NPT ³⁄₄ to 1¹⁄₂"
flow switch PVDF
FST-212-SPST Thermal dispersion PVDF 3.0 x ³⁄₄ NPT ³⁄₄ to 1¹⁄₂"
flow switch
FST-221-SPST Thermal dispersion PP/ 4.5 x ³⁄₄ NPT 2 to 12"
flow switch PVDF
FST-222-SPST Thermal dispersion PVDF 4.5 x ³⁄₄ NPT 2 to 12"
flow switch
Flow Switch Fittings For Use with 76 mm (3") Sensor Only
(Also For Pulsating Flow Applications)
Use With
Model No. Wetted Material Range (GPM) Pipe/Tube ID
FT-51 PP 0.05 to 1.53 ¹⁄₈ to ¹⁄₂"
FT-52 PVDF 0.05 to 1.53 ¹⁄₈ to ¹⁄₂"
Comes complete with operator’s manual.
Two extended cable lengths available: for 7.62 m (25') add suffix “-25” for PP/PVDF, or PVDF;
for 15.24 m (50') add suffix “-50” for PP/PVDF or PVDF, for additional cost.
Note: Sizes above
Ordering Examples: FST-211-SPST, flow switch, 3.0 x
FST-221-SPST, flow switch, 4.5 x
1
" fit into
⁄
2
3
NPT fitting adaptor.
⁄
4
3
NPT.
⁄
4
B-87
114 mm
(4.5")
76 mm
(3")
FST-211-SPST
shown actual size.
3
NPT size, plus FT-51, fitting.
⁄
4
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