Signet 2537 Paddlewheel Flow Sensor

 This sensor is an improvement on what’s already an industry standard. It has the added functionality of various output options including flow switch, multi-functional pulse, digital (S3L) or 4 to 20 mA. Additionally, it offers low flow, low power and high resolution and can be configured onsite directly through the built-in user interface.

Installation is simple because the Signet 2537 utilizes the same fittings as the popular Signet 515 and 2536 Paddlewheel Sensors and fits into pipe sizes ranging from DN15 to DN200 (½ to 8 in.). Available in Polypropylene and PVDF, it is ideal for a variety of applications including chemical processing, water and wastewater monitoring and scrubber control.


  • Digital (S3L) or 4 to 20 mA outputs or (Multi-function)
  • Allows for up to six sensors to Signet 8900 Multi-Parameter Controller
  • Low fl ow capabilities down to 0.1 m/s (0.3 ft/s)
  • Polypropylene or PVDF sensor bodies
  • Polypropylene and PVDF retaining nuts standard, Valox optional
  • Installs into pipe sizes DN15 to DN200 (½ to 8 in.)
  • Test certificate included for -X0, -X1
  • Low power and high resolution


  • Process Flow Monitoring
  • Pump Protection
  • Pure Water Production
  • Filtration Systems
  • Chemical Production
  • Reverse Osmosis
  • Demineralization/Regeneration
  • Fume Scrubbers
  • Cooling Towers
  • Proportional Metering Pump


Operating Range 0.1 to 6 m/s 0.3 to 20 ft/s
Pipe Size Range DN15 to DN200 ½ to 8 in.
Linearity ±1% of max. range @ 25 °C (77 °F)
Repeatability ±0.5% of max. range @ 25 °C (77 °F)
System Response 100 ms update rate nominal
Wetted Materials
Sensor Body Glass-filled PP (black) or PVDF (natural)
O-rings FKM (std) optional EPR (EPDM) or FFKM
Rotor Pin Titanium, Hastelloy-C or PVDF; optional Ceramic, Tantalum or Stainless Steel
Rotor Black PVDF or Natural PVDF; optional ETFE, with or w/o carbon fiber reinforced PTFE sleeve for rotor pin
Multi With Dry Contact Relay 24 VDC nominal, ±10%, regulated, 30 mA max current
With Solid State Relay 6 V to 24 VDC, ±10%, regulated, 30 mA max current
Digital (S3L) 5.0 VDC min to 6.5 VDC max., 30 mA max current (1.5 mA nominal)
4 to 20 mA 400 mV max ripple voltage, 30 mA max current
Maximum Pulse Rate 300 Hz
Maximum Pulse Width 50 ms
Minimum Pulse Rate 0.5 Hz
Compatible with PLC, PC or similar equipment
Compatible with customer supplied metering pump
Digital (S3L) Version 5 VDC nominal, regulated, 3 mA max current
  Type Serial ASCII, TTL level 9600 bps
Maximum Cable Length Refer to Signet 8900 wiring specifications.
Compatible with Model Signet 8900, 9900 and 9950
4 to 20 mA Version 12 to 32 VDC nominal, ±10%, regulated, 21 mA max current
  Loop Accuracy ±32 µA @ 25 °C @ 24 VDC)
Loop Resolution 5 µA
Temperature Drift ±1µA per °C max.
Power Supply Rejection ±1µA per V
Maximum Cable 305 m 1000 ft
Maximum Loop Resistance 600 Ω @ 24 VDC 1 KΩ @ 32 VDC
Load Impedance 375 Ω
Reverse Polarity and Short Circuit Protected Up to 40 V, 1 hour
Over-voltage Protection > 40 VDC over 1 hour

Download Datasheet : Signet 2537 Paddlewheel Flow Sensor

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