Dwyer PDWS Series Paddlewheel Flow Sensor
Dwyer PDWS Series Paddlewheel Flow Sensor

Dwyer PDWS Series Paddlewheel Flow Sensor

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Dwyer PDWS Series Paddlewheel Flow Sensor 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.

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.

Dwyer PDWS Series Features

  • 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

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.


  • Industrial water & wastewater treatment
  • Cooling water monitoring
  • Industrial fluid control
  • Chemical proportioning
  • Fluctuating fluid conductivity applications
Another Article:

Dwyer PDWS Series Specification

Service Compatible clean liquids.
Range 0.3 to 30 ft/s (0.09 to 9.14 m/s).
Wetted Materials Sensor: 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 Limits Brass, 316 SS: 200°F (93°C); PVC, Polypropylene: 130°F (55°C).
Pressure Limits Brass: 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).
Output Current sinking, square wave pulse, opto-isolated.
Power Requirements 6 to 24 VDC, 2 mA (max. 20 mA).
Enclosure Rating NEMA 4X (IP66).
Weight 2 lb (907 g).

Download Data Sheet: Series PDWS Paddlewheel Flow Sensor

Ref: dwyer-inst.com

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