Omega Products FST-212-SPST User Manual
THERMAL DISPERSION
FLOW SWITCHES FOR LIQUIDS
FST-200 Series
Starts at
$
185
⻬ High Reliability—
No Moving Parts
⻬ Very Low Flow
Detection–Down to
0.04 FPS Liquids
⻬ Use in
12" Pipe or Tubing
⻬ SPST Relay Standard
⻬ 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, see page B-90
for details.
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)
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
1
⁄8 to
FST-221-SPST, $195,
shown actual size.
114 mm
(4.5")
76 mm
(3")
FST-211-SPST, $185,
Cable Specifications: 3 m (10')
Max Cable Length: 305 m (1000')
Dimensions:
76.2 or 114.3 L x 26.7 mm dia.
(3.0 or 4.5 x 1.05")
shown actual size.
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
Model No. Price Description Mat’l Size Pipe Size
FST-211-SPST $185 Thermal dispersion PP/ 3.0 x
flow switch PVDF
FST-212-SPST 295 Thermal dispersion PVDF 3.0 x
flow switch
FST-221-SPST 195 Thermal dispersion PP/ 4.5 x
flow switch PVDF
FST-222-SPST 305 Thermal dispersion PVDF 4.5 x
flow switch
3
⁄
4
3
⁄
4
3
⁄
4
3
⁄
4
Flow Switch Fittings For Use with 76 mm (3") Sensor Only
(Also For Pulsating Flow Applications)
Model No. Price Wetted Material Range (GPM) Pipe/Tube ID
FT-51 $50 PP 0.05-1.53
FT-52 90 PVDF 0.10-6.53
Comes complete with operator’s manual.
Two extended cable lengths available: for 7.62 m (25') add suffix “-25” and $20 to price for
PP/PVDF, or $75 for PVDF; for 15.24 m (50') add suffix “-50” and $40 to price for PP/PVDF or
$150 for PVDF.
Sizes above
Ordering Examples: FST-211-SPST, flow switch, 3.0 x
$185 + 50 = $235.
FST-221-SPST, flow switch, 4.5 x
1
⁄
2
3
" fit into
NPT fitting adaptor.
⁄
4
3
NPT, $195
⁄
4
Recommended Reference Book:
FW-306, $135, See Section Y For Additional Books
Use With
3
NPT size, plus FT-51, fitting,
⁄
4
Valve Handbook,
B-87
Use With
3
to
to
1
to 1
⁄
4
3
1
to 1
⁄
4
1
"
⁄
2
1
"
⁄
2
NPT
NPT
NPT 2 to 12"
NPT 2 to 12"
1
⁄
8
1
⁄
8
⁄
2
⁄
2
"
"
One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | info@omega.com
EPG05
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