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Flow Switches

Paddle style, dry contact, two wire

Flow Switch for PVC or Copper Pipe Installation

The dry contact flow switch for PVC or copper are both two wire, paddle style with glass fiber reinforced plastic construction. The flow switch is designed with a magnetic force to reset the paddle so spring fatigue is eliminated. The Stenner S10P, Econ FP and S Series metering pumps have a flow switch operating mode that can interface with a two wire flow switch that accepts a dry contact signal.


The flow switch for PVC includes a glue-in adapter for easy mounting to a standard PVC slip fit tee. The nominal activation points are based on installation into a Spears 3/4″ or 1″ schedule 80 PVC tee. The activation points are 1.2 gallons per minute for 3/4″ and 1.9 gallons per minute for 1″.


The flow switch for copper has an adapter for soldering to copper pipe. The nominal activation points are based on installation in to an industry standard, smooth 3/4″ or 1″ copper pipe. The activation point for 3/4″ us 1.2 gallons per minute. The activation point for 1″ is 1.9 gallons per minute.

Part Number Description
EC500 3/4″ PVC
EC501 1″ PVC
EC50C 3/4″ Copper
EC51C 1″ Copper

Flow Rate Outputs

Technical Data

Switching Function Contact closes at increasing flow, opens at decreasing flow
Pressure Rating Maximum 145 psi*
Medium Temperature / Ambient Temperature Maximum +212° F* (+100° C) / Maximum +158° F* (+70° C)
Protection Class IP 65
Switching Current Maximum 1A
Switching Voltage Maximum 230 VAC, 48 VDC
Switching Capacity Maximum 26 VA, 20 W


Materials of Construction
Body / Paddle System PPO Noryl GFN3
Adapter PVC: Glue-in, Copper: Brass, soldering
Adapter for Copper Brass, soldering
Gasket EPDM
Magnet Hard Ferrite
Cable PVC

* Values for flow switch, observe maximum values of PVC slip fit tee or of copper pipe

Agency Listings

  • cETLus Component Recognized
  • UL 508
  • UL 353
  • CSA C22.2#14-05
  • Water Regulations Advisory Scheme

Dimensions & weight


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