Liquid level detection and dry run protection

The Baumer LSM liquid level limit switch uses a high frequency signal sweep, radiated from the sensor tip into the tank, to alarm when no liquid is present at the probe

The LSM liquid level limit switch uses a high frequency signal sweep, radiated from the sensor tip into the tank.

The liquid media in the tank will act as the dielectric within a capacitor, which together with the coil in the sensor head, will form a circuit creating the switch point signal.

The capacitive measurement will depend of the di-electric value of the media, which is well defined for most water based media.

The measurement is precise and unaffected by the mounting position, formation of foam, turbulence, bubbles and condensate.

Excessive foam, however, or other adhesive parts of the media will create a permanent capacitor, which might disturb the measurement.

Setting the jumper according to the table will compensate for this influence.

Further, a damping can be activated in case of a fluctuating media level, e.g with splashing during tank filling.

For non-aqueous (low di-electric value) media such as oils or solvents, a special model is available.

The LSM measures liquids such as water and beer as well as viscous, sticky fluids, such as honey, yoghurt and toothpaste.

Even some dry media can be measured.

The LSM is ideal for tanks where CIP and SIP is a major requirement.

An updated detailed applications list is available on the Baumer Process website.

Hygienic installation is possible with the comprehensive range of accessories available.

Please refer to the specific data sheet "Accessories".

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