Series SFI-100T Sight Flow Indicator/Transmitter

Output for Flow Rate and Totalization

The SERIES SFI-100T Sight Flow Indicators & Transmitters is a low cost and durable flow transmitter that combines our popular 100 Series Sight Flow Indicator with our A-711T output sensor for visual and remote monitoring of flow. The A-711T output sensor has two pulsed voltage signals with one providing a 5 VDC pulse, the other a pulse of the input supply voltage used, ranging from 8 to 28 VDC and a pulsed output with a frequency change proportional to the flow rate.

Product Applications

  • Monitor chilled or hot water flow
  • Monitoring water flow in chillers
  • Cooling and lubrication circuits
  • HVAC systems

Models & Ordering

Model Description Usually Ships Price Order
Ships: 2-3 Weeks
Price: $170.00
Brass sight flow indicator with A-711T sensor, range 2-20 GPM (7.6-75.5 LPM), 1/2" female NPT. 2-3 Weeks $170.00 Order
Ships: 2-3 Weeks
Price: $170.00
Brass sight flow indicator with A-711T sensor, range 3-35 GPM (11.4-132.5 LPM), 3/4" female NPT. 2-3 Weeks $170.00 Order


Compatible fluids.
Wetted Materials:
Body: Brass; Window: Tempered glass; Rotor: Red UV stabilized PBT; Rotor pin: 316 SS; Thrust washers: 300 series SS; Gasket: Buna-N.
Temperature Limits:
-20 to 200°F (-29 to 93°C).
Pressure Limits:
125 psi (8.62 bar).
Viscosity Maximum:
200 SSU.
SFI Only: 1.5 lb (0.7 kg); with A-711T: 1.8 lb (0.8 kg).

Temperature Limits:
-20 to 212°F (-29 to 100°C).
Power Requirements:
8 to 28 VDC.
Output Signal:
White lead: 5 VDC; Green lead: 8 to 28 VDC equal to supply voltage. Pulsed output with frequency rate proportional to flow rate.
±5% of FS.
Frequency Output Range:
0 to 100 Hz.
Mounting Orientation:
Electrical Termination:
Black lead: Ground; White lead: 5 VDC out pulse; Green lead: 8 to 28 VDC out pulse; Red lead: 8 to 28 VDC supply.


  • Constructed of a robust, solid brass body and a tempered glass window
  • Bright red impeller yields great visual indication of flow through the window
  • Front window can be easily unscrewed to clean out the sight flow indicator
  • Ideal for outdoor applications with weatherproof body that is unaffected by UV light


Model Number Description Usually Ships Price Order
A-711T Output sensor package for Series SFI-100T. 1-2 Weeks $61.50 Order

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