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Thermal Dispersion Flow
swiTches For use wiTh Gases
FST-320 Series
U Measure Mass
Flow of Gases
U High Reliability,
No Moving Parts
U Effectively Monitor
Critical Gas Flows
U May Be Used in Small
Piping or Large Ducts
U Standard with
SPST Relay
76 mm
(3")
FST-323-SPST
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. The FST-320 family of
sensors can be easily installed in
line sizes ranging from 3⁄4 to 12".
FST-321-SPST
cutaway view
FST-321-SPST
shown actual size.
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
Temperature: 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)
Maximum 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')
Maximum 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
To Order
Model No. Material Size Use with Pipe Size
FST-321-SPST PP/PVDF 3" x ³⁄₄ NPT ³⁄₄ to 1¹⁄₂"
FST-322-SPST PVDF 3" x ³⁄₄ NPT ³⁄₄ to 1¹⁄₂"
FST-323-SPST PP/PVDF 4.5" x ³⁄₄ NPT 2 to 12"
FST-324-SPST PVDF 4.5" x ³⁄₄ NPT 2 to 12"
Comes complete with operator’s manual.
Two extended cable lengths available: for 7.62 m (25') add suffix “-25” for additional cost
PP/PVDF, or PVDF; for 15.24 m (50') add suffix “-50” for additional cost, for PP/PVDF or
for PVDF.
Ordering Examples: FST-321-SPST, polypropylene flow switch.
FST-323-SPST, polypropylene flowswitch, 4.5 x
B-88
3
⁄
4
NPT.
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