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THERMAL DISPERSION FLOW
SWITCHES FOR USE WITH GASES
FST-300 Series
Starts at
$
195
⻬ Measure Mass
Flow of Gases
⻬ High Reliability,
No Moving Parts
⻬ Effectively Monitor
Critical Gas Flows
⻬ May Be Used in Small
Piping or Large Ducts
⻬ Standard with
SPST Relay
76 mm
(3")
FST-321-SPST, $195,
shown actual size.
FST-323-SPST, $205,
shown actual size.
114 mm
(4.5")
B
OMEGA’s FST-320 Series thermal
dispersion flow switches, especially
designed for use with gases, sense
changes in the heat transfer
characteristics of the gases. Flow
velocities from 1 to 90 fps are
effectively monitored. The flow
switch incorporates a standard
SPST Relay switch output for
control flexibility. OMEGA
®
controllers can easily be interfaced
to perform a variety of control
functions (see page B-90). The
FST-320 family of sensors can be
easily installed in line sizes ranging
from 3⁄4 to 12".
FST-321-SPST
cutaway view
SPECIFICATIONS
Range: 1 to 90 fps
Accuracy: ±5% of setpoint at constant
temperature and flow rate
Response Time (Approx.):
10 sec, after initial 30 sec warm up
Set Point Drift with Fluid Temp.:
0.5% per °C
Voltage Input: 12 to 36 Vdc @ 70 mA
Contact Output:
Selectable, NO or NC states
Fluid Temp. Rating:
0 to 60°C (32 to 140°F)
Max. Fluid Pressure:
PP: 150 psi @ 25°C (77°F) derated
@ 1.667 psi per °C above 25°C (77°F)
Contact Materials: Polypropylene (PP)
with PVDF
Cable Length: 3 m (10')
Max. Cable Run: 305 m (1000')
Dimensions: 76.2 or 114.3 x 26.7 mm
(3.0 or 4.5 x 1.05"),
3
⁄4 NPT
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
Model No. Price Material Size Use with Pipe Size
3
NPT, $205.
⁄
4
3
NPT
⁄
4
3
NPT
⁄
4
3
NPT 2 to 12"
⁄
4
3
NPT 2 to 12"
⁄
4
FST-321-SPST $195 PP/PVDF 3" x
FST-322-SPST 305 PVDF 3" x
FST-323-SPST 205 PP/PVDF 4.5" x
FST-324-SPST 315 PVDF 4.5" x
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.
Ordering Examples: FST-321-SPST, polypropylene flow switch, $195.
FST-323-SPST, polypropylene flowswitch, 4.5 x
3
1
to 1
"
⁄
⁄
4
2
3
1
to 1
"
⁄
⁄
4
2
Recommended Reference Book: HVAC: Equations, Data, and Rules
of Thumb FW-302, $60. Visit omega.com/bobi for Additional Books
B-88
Page 2
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