Omega Products FST-211-R User Manual
FLOW SWITCH WITH COMPACT
RELAY CONTROLLER
FST-211-R
Starts at
$
480
⻬ Offered in Liquid and
Gas Configurations
⻬ All-Plastic Construction
with PP or PVDF Materials
for Corrosive
Environments
⻬ Invert Switch Provides
Simple NO or
NC Relay Operation
⻬ LED Indicators for Fluid,
Relay, and Power Status
⻬ 0 to 60 Second Time
Delay Dampens Out
Relay Chatter
⻬ Fail-Safe Controller
Provides Direct
Actuation of Pumps,
Valves, and Blowers
SPECIFICATIONS
Relay Controller
Supply Voltage: 120/240 Vac 50/60 Hz
Consumption: 0.25 A
Relay Type: (1) SPDT
Relay Current: 10 A, 250 Vac,
Relay Mode: NO or NC selectable
Time Delay: 0 to 60 s
Temp Range: -40 to 70°C (-40 to 158°F)
Enclosure Rating: NEMA 4X (IP66)
Enclosure Material:
Polypropylene (UL 94VO)
Enclosure Rotation: 300° swivel base
Conduit Connection:
1
⁄2 NPT
Sensor
Range: 0.04 to 3 ft/s (liquids)
Accuracy: ±5% of setpoint at constant
temperature and flow rate
Response Time: 10 s (approx.)
Setpoint Drift with Fluid Temperature:
0.5%/°C
Fluid Temperature: 60°C (140°F)
1
⁄2 hp
Max Fluid Pressure: PP or PVDF:
150 psi @ 25°C (77°F) derated @
1.7 psi/°C above 25°C (77°F)
Process Connection:
Dimensions: 208 L x 71 mm Dia
(8.2 x 2.8")
3
⁄4 MNPT
APPLICATION
This switch package offers a
complete solution for flow or no-flow
switching in pipes or ducting up to
0.3 m (12"). The compact relay
controller reliably actuates valves,
pumps, or blowers rated up to 1⁄2 hp.
Common applications include
low-flow pump or process
protection. To complete the
instrumentation package, simply
select the switch configuration in
accordance with the liquid or gas
used in your application.
LIQUID APPLICATION
VARIABLES
Variable Yes No
Clean ⻬
Slurry ⻬
Bubbles ⻬
Coating ⻬
Non-Coating ⻬
Low Viscosity ⻬
Med. Viscosity ⻬
High Viscosity ⻬
Liquid
Low Temperature ⻬
Med. Temperature ⻬
High Temperature ⻬
Δ Temperature ⻬
Low Velocity ⻬
High Velocity ⻬
FST-211-R, $480,
shown smaller
than actual size.
GAS APPLICATION
VARIABLES
Variable Yes No
Low Temperature ⻬
Med. Temperature ⻬
High Temperature ⻬
Δ Temperature ⻬
Gas
Coating ⻬
Non-Coating ⻬
Low Velocity ⻬
High Velocity ⻬
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
Model No. Price Description Material Pipe Size
FST-211-R $480 Liquid flow switch with relay PP/PVDF
FST-212-R 590 Liquid flow switch with relay PVDF
FST-221-R 490 Liquid flow switch with relay PP/PVDF 2 to 12"
FST-222-R 600 Liquid flow switch with relay PVDF 2 to 12"
FST-321-R 490 Gas flow switch with relay PP/PVDF
FST-322-R 600 Gas flow switch with relay PVDF
FST-323-R 500 Gas flow switch with relay PP/PVDF 2 to 12"
FST-324-R 610 Gas flow switch with relay PVDF 2 to 12"
Flow Switch Fittings, Use with 3" Sensor Only (
FT-51 $50
FT-52 90
Comes complete with operator’s manual.
Ordering Examples: FST-211-R, CE-approved polypropylene liquid flow switch with relay, $480.
FST-321-R, PP/PVDF gas flow switch, $490.
Recommended Reference Book:
CM-4449, $105, See Section Y For Additional Books
Use with 0.05 to 1.53 GPM range
Use with 0.10 to 6.53 GPM range
1
⁄
Valve Selection Handbook,
Wetted
1
-
" Pipe and Tubing)
⁄
8
2
PP
PVDF
3
⁄
4
3
⁄
4
3
⁄
4
3
⁄
to 1
to 1
to 1
to 11⁄2"
4
1
to
⁄
8
1
to
⁄
8
1
1
1
1
1
"
⁄
2
"
⁄
2
"
⁄
2
"
⁄
2
"
⁄
2
B-89
One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | info@omega.com
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