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Flow Sensors


  • Corrosion-resistant plastic housing
  • M32 cable gland for pressure-resistant fitting
  • Adjustments with Potentiometer or teach-in
  • Various designs available

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  • Sensor and evaluation device in one housing or separate
  • Stainless steel sensor head in different thread types
  • Easy start-up by means of the teach-in function
  • Reliable status report at maintenance free operation

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Flow sensors from Proxitron can monitor the flow speed of media in liquid or gas form to enable the simple and effective control of flow processes. The basis of this sensor system is the calorimetric principle.

It makes use of the cooling effect on a surface of a medium flowing past it, similar to how your finger feels cold when held up in the wind. On a flow sensor, the surface of the sensor is heated up to a defined temperature. If this surface is exposed to a flow, the sensor surface cools down. The stronger the flow, the stronger the cooling effect, which serves as a measure of the flow speed. The cooling effect of the flow is analysed electronically, and the flow sensor delivers an output signal based on this, according to the version, which can be used to monitor the flow.

The possible uses of flow sensors are highly diverse, ranging from general air-conditioning technology, to extraction systems, all the way to monitoring coolant and lubricant circuits. In contrast to indirect flow monitoring, which monitors the rotational movement of fans or pumps, with this principle the flow of the medium is monitored directly, therefore also enabling detection of soiled filters and congestion or blockages in the flow circuit. The adjustable flow value can provide advance warning of the flow dropping below a minimum acceptable limit, for example, to promptly initiate maintenance work on an exhaust system. The zero-maintenance and wear operation of Proxitron flow sensors means they are superior to other sensor systems such as air direction relays and vane anemometers, and makes them the preferred choice wherever reliable and fault-free flow monitoring is required.


The design of the sensors in a seamless enclosed housing makes them perfect for use in high-pollution environments. Proxitron air flow sensors (air flow monitors), with their all-plastic housing, are at home wherever there are aggressive chemical atmospheres. They are even resistant tosulphuric-acid-laden fumes from galvanic baths, and can operate flawlessly for many years.

Flow sensors from Proxitron are available in various versions. A distinction is made between sensors for monitoring media in gas form and in liquid form.

Flow sensors for gases (also known as air flow monitors) mostly have a compact plastic housing, allowing them to be easily installed in existing exhaust systems or ventilation systems.

Flow sensor for liquids have stainless steel process connections in common pipe thread sizes. In both cases, variants are available for AC or DC operating voltage, with different switching output types or with analogue output. The devices can be supplied both with fixed connection cables of various lengths or with the customary M12 plug connector. Proxitron flow sensors are also distinguished by their ease of operation. At the push of a button, the sensor detects the flow und adjusts the flow limit value to reliably detect a breakdown of the flow. This offers a variety of possible uses in a large range of sectors of industry, as well as for air-conditioning technology and building automation. The range is completed by coordinated accessories, allowing among other things pressure-resistant installation of the sensors. Wherever a high-performance but cost-effective solution is required for flow monitoring, we are happy to place our expertise at your disposal.

Particular features

  • maintenance-free
  • wearree
  • Compact design
  • Easy to operate
  • Cost-effective
  • AC and DC operating voltage
  • Different switching variants
  • 0-10 V or 0/4-20 mA output
  • Various stainless steel process connections
  • Chemically resistant, all-plastic housing

Areas of application

  • Coolant circuits
  • Exhaust monitoring
  • Air-conditioning technology
  • Exhaust systems
  • Injection of lubricants
  • Inflow and outflow of liquids
  • Pump monitoring
  • Filter monitoring
  • Bearing cooling systems
  • Building technology
  • Electroplating
  • Chemical industry
  • Labs and educational facilities
  • Sewage treatment plants
  • Offshore
  • Food processing industry
  • Shipbuilding
  • Wood processing
  • Combined heat and power plants
  • Paper processing
  • EDP data centres
  • Nuclear research