Flow Switch With Compact Relay Controller

FST-200-R and FST-300-R

Flow Switch With Compact Relay Controller | FST-200-R and FST-300-R

Flow Switch With Compact Relay Controller

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  • Offered in Liquid and Gas Configurations
  • All-Plastic Construction with PP or PVDF Materials for Corrosive Environments
  • Invert Switch Provides Simple NO or NC Relay Operation
  • LED Indicators for Fluid, Relay and Power Status
  • 0-60 Second Time Delay Dampens Out Relay Chatter
  • Fail-Safe Controller Provides Direct Actuation of Pumps, Valves and Blowers
Medidores de Vazão tipo Área Variável, Rotâmetros e Chaves de Fluxo - Ver Produtos Relacionados


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.

Variable Yes
Clean Y
Slurry Y
Non-Coating Y
Low Viscosity Y
Med. Viscosity Y
High Viscosity
Low Temperature Y
Med. Temperature
High Temperature
Δ Temperature Y
Low Velocity Y
High Velocity
Variable Yes
Non-Coating Y
Low Temperature Y
Med. Temperature Y
High Temperature
Δ Temperature
Low Velocity Y
High Velocity

Supply Voltage: 120/240 Vac 50/60 Hz
Consumption: 0.25 A
Relay Type: (1) SPDT
Relay Current: 10 A, 250 Vac, 1/2 hp
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
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)
Max Fluid Pressure:
   PP or PVDF: 150 psi @ 25°C (77°F) derated @ 1.7 psi/°C above 25°C (77°F)
Process Connection: 3/4 MNPT
Dimensions: 208 L x 71 mm Dia (8.2 x 2.8")


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