Complete Guide on The working of Flow switch

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Do you intend to buy a flow switch? It's the best device you can ever think of if you seek to monitor the flow rate of fluids with a high accuracy level. A flow switch is an instrument you can apply and measure the flow rate and pressure of air, liquids, and gaseous substances via a system or a duct. 

How flow switch measures the flow rate

A flow switch consists of different parts that function together to help monitor the rate of flow. Many flow switches have a paddle. The paddle is connected to the circuit and mounted in the pipe through which gases or liquid passes. When the substance you want to measure begins flowing, the paddle begins to rotate. That rotation transfers a signal to the transducer. 

The raw signal from the paddle is received by a transducer, which then sends it to the transmitter in a format that can be read. In the transmitter, the signals are read based on the preset parameters. Once the signals are read, the transmitter will perform any action required to cause adjustments within the flow system.

A flow switch monitors and reports the flow rate. It can also control the flow rate of gases and fluids via a given section of a system or the entire system. The flow switch will maintain flow within your set parameters. If the flow rate drops or exceeds what you require, the flow switch will start a series of reactions. It can activate an alarm, power on your pump, divert the liquid flow, or even shut down parts of the flow system. 

Installation and testing of a flow switch

Flow switches are of different types. So, the installation process depends on the type of flow switch you want. But there are essential rules of thumb you won't escape when installing any flow switch. These include 

  • You are required to install a flow switch on a straight part of a duct or pipe.
  • Maintain the right length of a straight pipe behind and in front of your flow switch.
  • Don't fit a flow switch near bends. It's also important to avoid fixing it near other fittings, wide or narrow sections of your pipe, drains, and valves. They may affect o adjust the flow rate, which influences how your flow switch works.

Testing how a flow switch works will also depend on the kind of the switch. You may be able to tell if your flow switch is functioning well by just looking at it while in action. Ensure you examine if the accurate responses are produced when the flow begins or stops. But that doesn't apply everywhere. In other situations, you can be required to use an ohmmeter. It can help you measure the resistance of your switch's electronics. That's a sure way to confirm if a complete circuit is working once you activate your flow switch. 

In case you use those two steps and no positive results, consider replacing or repairing your flow switch. That way, you can be sure it will function well and give you accurate data concerning the flow rate.


A flow switch is a vital device that can help you monitor the rate of fluid flow. There are many types of flow switches. Ensure to get the one that suits the liquid you intend to measure. With the proper installation of your flow switch, you can expect accurate results.

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Published: 2020/12/15 - Updated: 2021/01/18
Total: 570 words

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