Flow Switches Made in the U.S.A. · Serving Industry Worldwide
Technical Reference
How to Install a
PEECO Flow Switch
Proper installation is critical to accurate, reliable flow switch performance. Follow these guidelines to ensure correct actuation, long service life, and safe operation.
Standard Mounting Configuration
Vertical mount on horizontal pipe — the default and recommended installation
Note: Switches will not work properly in turbulent flow. Always provide adequate straight pipe run. Other mounting orientations (horizontal, angled) must be specified at time of quotation and may require special configuration.
Installation Steps
Select the Correct Location
Install the flow switch in a straight run of pipe with a minimum of 10 pipe diameters of straight run upstream and 5 pipe diameters downstream. Avoid installing near elbows, valves, reducers, or other flow disturbances that create turbulence.
Verify Mounting Orientation
Standard installation is vertical mounting on a horizontal pipe run (switch body pointing up, paddle hanging down into the flow). Other orientations are available but must be specified at time of order. The switch must be installed within 5° of vertical unless otherwise engineered.
Install the Flow Switch
For threaded (NPT) models: apply thread sealant and hand-tighten, then wrench-tighten to the appropriate torque. For flanged models: align the flange, install gasket, and torque bolts evenly in a cross pattern. For wafer tee models: insert between flanges per the dimensional drawing.
Verify Flow Direction
Confirm that flow direction through the line matches the arrow or label on the switch body. Reverse flow will not actuate the switch correctly. For bi-directional (multiple action) models, flow direction is less critical — consult your order documentation.
Make Electrical Connections
Route conduit to the 1/2″ FNPT conduit connection (3/4″ and metric available). Connect wiring per the terminal diagram on the nameplate. Standard SPDT: N.O. (Normally Open), N.C. (Normally Closed), and Common terminals. Verify voltage and current ratings match your application.
Adjust the Set Point
All PEECO flow switches are fully field-adjustable. With flow established, adjust the set screw to the desired actuation point. The switch should actuate cleanly with less than 10% dead band between make and break. Re-check adjustment after system reaches operating temperature and pressure.
Installation Requirements
Important Warnings
Field Adjustment
All PEECO flow switches must be adjusted after installation unless a third-party calibration has been requested and provided at time of order. The switch is fully field-adjustable across its entire operating range.
Water and nitrogen are used for factory flow testing to establish minimum activation and deactivation points. Field conditions (media, temperature, pressure, specific gravity) will affect the actual actuation point — use the velocity correction factors in the Flow Rate Table when working with fluids other than water.
View Flow Rate Table & Velocity Correction FactorsReady to Order Your Flow Switch?
Every PEECO flow switch is custom-engineered for your application. Submit your process conditions and receive pricing and delivery typically within one business day.
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