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FST200-Series
Thermal Dispersion Flow Switches for Liquids
Models In Stock
- High Reliability — No Moving Parts
- Very Low Flow Detection–Down to 0.04 FPS Liquids
- Use in 1/8 through 12' Pipe or Tubing
- SPST Relay Standard
FST200-Series
From
$
280.40
Models In Stock
Product Overview
- Accuracy ± 5 %
- Accuracy Note ±5% of setpoint at constant temperature and flowrate
- Additional Features 1
- Adjustments Potentiometer
- Approvals CE
- Approvals Note CE compliance: EN 61326 EMC EN 61010‐1 safety
- Cable Length Note Max: 100 ft
- Diameter 1.05 in
- Electrical Connection 3/4 in NPT male Conduit with Cable
- Enclosure Ratings IP65, NEMA Type 4X
- Linear Flow Rate, Max 3 ft/s
- Linear Flow Rate, Min 0.04 ft/s
- Media Compatibility Liquids
- Operating Pressure, Max 150 psi
- Operating Pressure Note Maximum Fluid Pressure: PP or PVDF: 150 psi @ 25°C (77°F) derated @ 1.667 psi per °C above 25°C (77°F)
- Operating Temperature, Max 60 °C
- Operating Temperature, Min -40 °C
- Power Consumption 70 mA
- Process Connection Size 3/4 in
- Process Connection Type NPT Male
- Process Temperature, Max 60 °C
- Process Temperature, Min 0 °C
- Response Time 10 sec
- Response Time Note 10 sec after initial 30 sec warm up
- Supply Power Note 12 to 36 Vdc @ 70 mA
- Supply Voltage 12 to 36 Vdc
- Switch Rating 1 A
- Switch Type SPST NO/NC, Selectable
- Thermal Effects 0.5%/°C
- Viscosity Range 1 to 300 cPs
- Wire Gauge 22 AWG
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-131 and LVCN-141 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 seconds after initial 30 sec warm up
Setpoint Drift with Fluid Temperature: 0.5% per °C
Voltage Input: 12-36 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
Cable Specifications: 3 m (10 ft)
Max Cable Length: 305 m (1000 ft)
Dimensions: 76.2 or 114.3 x 26.7 mm dia. (3.0 or 4.5 x 1.05')
SPECIFICATIONS
Range: 0.04 to 3 fps (liquids)
Accuracy: ±5% of setpoint at constant temperature and flowrate
Response time: 10 seconds after initial 30 sec warm up
Setpoint Drift with Fluid Temperature: 0.5% per °C
Voltage Input: 12-36 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
Cable Specifications: 3 m (10 ft)
Max Cable Length: 305 m (1000 ft)
Dimensions: 76.2 or 114.3 x 26.7 mm dia. (3.0 or 4.5 x 1.05')
PDFs & Manuals
Show Ratings & Reviews
Rated 1 out of
5
by
Brook from
Great product! Unacceptable service
I have one installed in a housing I made myself, and it has been working perfectly for about a year now.
Date published: 2017-05-12
Rated 3 out of
5
by
DTK_HVAC from
Flow Switch service replacements
Sensors worked good, Many challenges to overcome for DC power supply, DC relay connections, and additions of DC to AC relays for proper operation
Date published: 2020-08-03
Rated 1 out of
5
by
NoTHappy_2 from
Documentation sucks
I guess these sensors connect themselves because there is ZERO info on the color code and wiring for NPN or PNP.
No flow data either?????
Date published: 2019-09-26
How does one set the flow at which the device switches?
Thank you for your inquiry. There's a potentiometer on the flow switch which you can use to set the switch point. Full instructions to set a switch point can be found in the manual on page 12.
Date published: 2019-08-18
Can this unit be used in a wash down area; is the housing sealed against water ingress?
Thank you for your inquiry! These sensors have a NEMA 4X rating and should not have any issues in a washdown area.
Date published: 2021-11-12