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SLFSI-BXX Flow Sensor Technical Specifications

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Technical Specs – SLFSI-BXX Flow Sensor.pdfDownload


  • Designed for service in metallic piping systems at points of connection or on pump assemblies.
  • Custom designed brass bodied tee for improved control of dimensions for more consistent measurement and improved performance at low flow.
  • Brass Threaded Retaining Nut instead of retaining pin makes it easier to service in a valve box, more moisture resistance for electronics resulting in longer life.
  • Unique 4 bladed lightweight impeller measures lower flow rates. Detects flow as low as 20% of published minimum rate of other impeller sensors
  • Smart electronics detection system contains a micro-processor for better signal filtering and conditioning. Detection circuit also contains superior over-voltage and overcurrent protection.

Professional Materials

  • Impeller – HDPE (High Density Polyethylene
  • Mounting Tee & Retaining Nut – Lead free Bronze Alloy C89833 Federalloy i-836
  • Shaft – Tungsten Carbide
  • O-ring — Buna-N
  • Sensor Insert — Type 1 PVC

Pressure Rating

  • 250 PSI @ 90 degrees F

Temperature Range

  • 32 degrees F to 140 degrees F (0 degrees to 60 degrees C)

Output Signal

  • Frequency Range: 0.3 Hz to 200 Hz
  • Output Pulse: 5 ms +/-25%

Transducer Performance

  • Quiescent current: 120 uA@8 VDC to 35 VDC max.
  • Off State: (VHigh) = Supply Voltage – (120uA X Source Resistance)
  • On State: (VLow) = Max. 0.85 VDC@50mA current limit, (10Ω +0.7VDC)

Flow Range

  • 0.50 to 15 FPS
  • 3 to 90 GPM

Electrical Cable

  • 2 single conductor solid copper U.L. listed #18 AWG leads with direct burial insulation
  • Lead length: 48 inches
  • Wiring may be extended up to 2,000 feet with direct burial, twisted pair shielded cable
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