Dwyer Series PDWS Paddlewheel Flow Sensor

Dwyer Series PDWS Paddlewheel Flow Sensor

Rotating paddlewheel flow transmitters are sensors with electrical transmission output for remote indication of liquid flow rate. Fixed insertion length models are available in this category. Also available are fittings and tees that allow the accurate sensor to be inserted in a wide range of pipe sizes. The Series PDWS Insertion Paddlewheel Flowmeters are designed for pipe size ranges from 1/2 to 8" with available materials of brass, stainless steel, PVC, and polypropylene. The Series PDWS is intended to be used with the Series PWF, a wide variety of custom tee, saddle, or welded fittings that come in bronze, PVC, and stainless steel.

Principle Of Operation

Uses the rotation of an impeller to measure flow. Liquid flow pushes the rotor and the rotation is detected by a Hall-effect sensor. The output is a current sinking pulse signal that can be connected to the Series RTI to display flow rate and total, or to the Series BAT for a 4 to 20 mA analog signal.


  • The bearings are made from ruby jewel to reduce the coefficient of friction and maintain high accuracy
  • PVC and polypropylene body material offers resistance against corrosive media


  • Industrial water & wastewater treatment
  • Cooling water monitoring
  • Industrial fluid control
  • Chemical proportioning
  • Fluctuating fluid conductivity applicationsSpecification
ServiceCompatible clean liquids.
Range0.3 to 30 ft/s (0.09 to 9.14 m/s).
Wetted MaterialsSensor: Brass, 316 SS, PVC, or polypropylene; Rotor: PVDF; Shaft: Nickel-bonded tungsten carbide (ceramic optional); Bearings: Ruby jewel; O-Ring: EPDM (fluoroelastomer optional).
Accuracy±1.5% FS.
Temperature LimitsBrass, 316 SS: 200°F (93°C); PVC, Polypropylene: 130°F (55°C).
Pressure LimitsBrass: 200 psi (14 bar); 316 SS: 250 psi (17 bar); PVC, polypropylene: 175 psi (12 bar) @ 75°F (24°C); High pressure option: 400 psi (28 bar) (SS only).
OutputCurrent sinking, square wave pulse, opto-isolated.
Power Requirements6 to 24 VDC, 2 mA (max. 20 mA).
Enclosure RatingNEMA 4X (IP66).
Weight2 lb (907 g).

Download Data Sheet: Series PDWS Paddlewheel Flow Sensor

Ref: dwyer-inst.com