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Flow Switches

23 Products
Compact Fan and Filter Fan Air Flow Switch

The FSW800B-Series air-flow monitor provides a simple but reliable alternative to indicate positive or negative air flow of fans.

Thermal Dispersion Flow Switches for Liquids

The FST-200 flow switches use thermal dispersion technology to create a very accurate and economical method of sensing flow. Monitor fluids from 0.4 to 1.2 specific gravity.

Trim to Size Paddle Type Flow Switch

The FSW-25 flow switch utilizes the force of liquid flow to propel its paddle and to detect the incoming flow or movement of the existing liquid in the pipe.

Thermal Dispersion Flow Switches for Use With Gases

The FST-320-Series thermal dispersion flow switches, especially designed for use with gases, sense changes in the heat transfer characteristics of the gases.

Flow Switches for Threaded Plastic Piping

The FSW500 offers low cost flow monitoring with a variety of switch actuation points and low pressure drop. All wetted parts are polypropylene or stainless steel.

Thermal Flow Switch

The FSW-420/30-Series monitors your relative flow rate for applications where the actual flow rate is not important. The FSW-420/30-Series is easy to install and use.

Industrial Flow Switches - From 2 to 15 Feet/second

The FSW-40A and FSW-50-Series flow switches feature 15 A SPDT switches. Their non-magnetic design makes these switches ideal for applications in which rust is a problem.



Economical Brass Flow Switches

The FSW301 flow switch comprises a paddle system with a permanent magnet attached. This construction allows a useful life of up to 100,000,000 switching cycles.

Non-magnetic Industrial Flow Switches - Ideal for Rusty Water

The FSW-30A flow switches are supplied with six orifices to provide 6 overlapping flow ranges from 0.12 to 8.0 GPM for water. Wetted Parts: brass, 316 SS, phosphor bronze.

Economical Air Flow Switch With High/Lo Alarms

The FST1000-Series measures air velocity and provides two SPST contact closures corresponding to high and low alarm set points. The alarm set points adjust from 0 to 100%


The Series V10 Flotect Mini-Size Flow Switches is designed to provide inexpensive, reliable monitoring of the presence or absence of flow in a system.


The Series V6 Flotect® Flow Switch is surprisingly compact, and specifically engineered to monitor liquid, gas, or air flows.

Heavy Duty Paddle Flow Switch

The FSW-160 is the newest heavy-duty line of flow switches.The switch is used to signal,start,or stop electronically operated equipment when flow or no-flow conditions occur.

3/4" Flow Switches for Threaded Plastic Piping

The FS-100-Series offers low cost flow monitoring with a variety of switch actuation points and low pressure drop. All wetted parts are polypropylene.

Thermal Dispersion Flow Switches

The FSW-6000/7000-Series are thermal flow switch monitors designed to monitor flow status and also used to detect level of liquids, air and gas with visual indication of flow

Flow Switch With Compact Relay Controller

This switch package offers a complete solution for flow or no-flow switching in pipes or ducting up to 12'. The compact relay controller actuates valves, pumps, or blowers.

Liquid Flow Transmitter and Switch with Visual Indication

The FSW-9000-Series is a flow switch monitor that measures the velocity of the flow. The-Series provides two output options: a 4 to 20mA analog output and a PNP/NPN output.

In-Line Plastic Flow Switch

The FSW-140-Series flow switches offer superior performance. Their fixed set-point make it a dependable switch. This-Series is an ideal choice for coolant applications.

Flow Switches

Flow switches are an essential part of many industrial, commercial, and laboratory applications. Omega Engineering offers a wide selection of flow switches featuring numerous configurations, ranging from economical air flow switches with high/low alarms, to heavy duty paddle flow switches, to 3/4” flow switches for threaded plastic piping. Additionally, we offer thermal dispersion flow switches for liquids, trim to size paddle type flow switches, and non-magnetic industrial flow switches for applications with rusty water.
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