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IFM Level sensing devices

IFM Level sensors

In industrial applications where fluids or bulk material are used, storage tanks or silos are used for processing or storing of media. Sensors are used to detect the levels. Even critical process conditions such as emptying a hydraulic tank or the unintentional overspill of a tank are monitored by level sensors.

Advantages of electronic sensors.

Deposits and wear and tear often lead to failures in particular if mechanical switches are in contact with the medium. The electronic ifm sensors however can do without any mechanical components. This makes the sensors especially robust and reliable.

Another advantage of electronic sensors is the local indication of the level or the easy setting of the switching threshold simply by pressing a button.

Measurement technique.

For continuous level measurement the level is detected continuously, converted into an electrical signal and indicated. Depending on the type the units have freely programmable switching outputs or an analogue output for further processing. Continuous level sensors from ifm electronic use three different physical measuring principles:

  1. For capacitive measurement the probe and the tank form an electrical capacitor. The capacity changes with the level and is converted into a level measurement by a microprocessor.

  2. For hydrostatic level measurement a measuring cell detects the hydrostatic pressure of the material. Here the pressure change is a measure for the level.

  3. The efector gwr level sensor operates on the principle of guided wave radar. Electromagnetic pulses are transmitted by the sensor head and guided along the probe. If the microwave pulse hits the medium to be detected, it is reflected and the time of flight is evaluated by the sensor.

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Seltec Automation LLP
Unit G, Venture Business Park
Witty Street, Hull
East Yorkshire

Tel: 01482 225 297
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