How to find the right Flow Switches AI guide

What the AI looks for in Flow Switches

Actuation set point vs your flow range

The switch's actuate and de-actuate flow rates for your pipe size must fall inside your normal and minimum flows. For paddle types, trim the paddle to the pipe size as the maker's chart specifies. A set point outside your operating range means the switch never trips or chatters constantly.

Listing for life-safety use

Sprinkler waterflow alarms require a waterflow switch listed and approved for fire protection service Generic industrial flow switches are not accepted for fire alarm signaling by inspectors or insurers.

Sensing principle vs fluid cleanliness

Paddle and piston types suit clean liquids. Thermal or no-moving-part sensors suit dirty or particulate-laden media. Debris jams paddles and pistons, causing false readings.

Straight pipe run and orientation

Install with the straight pipe run upstream and downstream that the maker specifies, and in the allowed orientation Turbulence from nearby elbows and valves causes false trips and premature paddle wear.

Electrical contact rating

The contact type (SPDT, dry contact, solid-state) and current rating must match the load, or the switch must drive a relay Switching a pump motor directly through an under-rated contact welds or burns it.

Wetted materials, pressure and temperature

Body and paddle materials must be compatible with the media, and the pressure and temperature ratings must exceed the system's Brass in aggressive water, or plastic in hot loops, fails early.