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FS Flow Switch

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Product Description
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Product Description

The FS flow switch offers an extremely reliable and economical solution for mechanical flow monitoring in liquid systems. Thanks to the non-adjustable design with a factory-set switch point, this monitor eliminates the risk of incorrect settings and guarantees consistent process protection. Whether for laser cooling, heat pumps or general industrial cooling circuits, the FS series stands for simplicity, a long service life and an excellent price/performance ratio.

Product specifications

Product specifications			Test method
Application		Measuring and controlling gases & liquids
Product group		Flow monitors and excess flow valves

Gerelateerde producten

FS flow switch: economical flow monitoring with a fixed setting

The FS flow switch is an extremely reliable, non-adjustable flow monitor designed for monitoring liquid flows in critical systems. Thanks to the simple design with only one moving part, the FS series offers an economical solution for installations where a fixed switch point is essential for process safety.

Why choose the FS series?

The FS flow switch is specifically developed for applications that require a 'set-and-forget' installation. Because the switch point is factory-set, there is no risk of incorrect adjustment in the field. This makes the monitor ideally suited for:

Laser cooling systems: protection against overheating due to flow loss.
Heat pumps: monitoring of the primary water flow.
General cooling systems: reliable status confirmation of liquid circulation.

Operation of the FS flow monitor

The technology behind the FS series is based on a magnetic piston that responds to the dynamic pressure of the medium:

Flow activation: as soon as the liquid flow increases, the magnetic piston moves vertically.
Switching: the magnet activates a hermetically sealed reed switch moulded into the housing outside the liquid flow.
Fail-safe: as flow decreases, the mass of the piston ensures immediate deactivation (snap action), on average 10% below the active switch point.

Technical specifications

The FS flow switch is available in various materials and configurations to meet your system requirements:

Feature	Specification
Materials	Brass, 316 stainless steel or PVC
Accuracy	± 10% of the switch point (calibration)
Repeatability	± 1% (exceptional consistency)
Pressure resistance	Brass/stainless steel: up to 103,4 barg (1500 PSIG) PVC: up to 8,3 barg (120 PSIG)
Temperature range	Metal: -18 °C to +149 °C PVC: +4 °C to +54 °C

Calibration table

Installation and integration

The FS flow switch requires vertical installation for correct operation. Thanks to the robust construction and the absence of internal seals (no seals), the unit is virtually maintenance-free. This considerably lowers the total cost of ownership of your machine or installation.

Do you have specific questions about the media compatibility of the FS series for your application? We are happy to advise you on the right choice of material, whether for standard water applications or more aggressive liquids. For more information, you can always visit the website of our partner ChemTec.

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