Dwyer AFS Series Piston Adjustable Flow Switch
Dwyer AFS Series Piston Adjustable Flow Switch

Dwyer AFS Series Piston Adjustable Flow Switch

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Dwyer AFS Series Adjustable Flow Switches are externally adjustable piston-type flow switches for oils, liquids, and gases. This Series offers an infinite number of flow settings from 0.5 to 20 GPM.

Shuttle or piston flow switches are sensors with an electrical contact output at a specific flow rate. Models are used with oil, air, water, and gases. Applications include oil flow control, low flow detection in cooling lines, and high-pressure lubrication systems. Rugged construction and excellent chemical compatibility simplify flow/no flow detection.

Dwyer AFS Series Features

  • Externally adjustable flow set point
  • Offers a number of flow settings at pressures up to 1000 psig, with low-pressure drop and precise repeatability


  • Protecting machine tools from coolant flow failure
  • Protecting bearings from loss of lubricant
  • Assuring proper air flow
  • Water or compatible liquid control
  • Oil flow control
  • Control of gas flows
Another Article:

Dwyer AFS Series Specification

Service Compatible gases or liquids.
Wetted Materials Housing and Piston: See model chart; Spring: 316SS; O-ring: Fluoroelastomer; Other: Epoxy.
Temperature Limits -20 to 300°F (-29 to 149°C), -20 to 225°F (-29 to 107.2°C) with polysulfone piston.
Pressure Limit 1000 psi (68 bar).
Accuracy ±10% of setpoint.
Repeatability ±1% maximum deviation.
Switch Type SPDT.
Electrical Rating 17 A @ 120 VAC, .08 A @ 240 VAC, .13 A @ 120 VDC, .06 A @ 240 VDC.
Electrical Connections 18 AWG, 24″ (61 cm), polymeric lead wires, optional 1/2″ male NPT conduit connection.
Process Connection 1/2″ female NPT ports.
Mounting Orientation Any.
Setpoint Adjustment Liquids: 0.5 to 20 GPM (1.9 to 75.7 LPM); Gases: 1.0 to 75 SCFM (28 to 2124 LPM) at 5 psig.
Required Filtration 50 microns or better.
Weight 2 lb, 11 oz (1.22 kg).
Agency Approval CE.

Download Data Sheet: Series AFS Piston Adjustable Flow Switch

Ref: dwyer-inst.com

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