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Limitent Hardness Monitoring Unit
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Herco Wassertechnik GmbH
Neckar, Germany
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Installed in the soft water pipe following softening units, the limitent automatic hardness control device with controller ensures that the soft water is always monitored for residual hardness. The apparatus doesn't need any chemicals or water because the measuring mechanism is based on resin shrinking or expanding. Provided as a potential-free changeover contact, a hardness breakthrough is visually signaled.


Protection class IP 54
Contact floating
Conditions of use An overpressure protection must be installed in the feed water line upstream of the hardness control unit. The spare sensor must be flushed with soft water before installation and soaked in soft water / permeate when stored.
Loading max. 250 V / 5 A / 600
WLED displays Operation / hard water
Operating temperature 5 – 35 °C
Ambient temperature 0 – 40 °C
Feed water pressure 2 – 6 bar

Utilizations of Limitent Hardness Monitoring Unit

  1. Plants are softened before installation.
  2. Guarding against hard water breakthrough for consumers or downstream stages.

Advantages of Limitent Hardness Monitoring Unit

  1. Stable and dependable hardness control mechanism.
  2. Water and chemicals are not used.
  3. Simple calibration and upkeep are not necessary.
  4. The shrink resin sensor is easily replaced.
  5. Aside from the output as a pot-free changeover contact, there is an optical indication of hardness breakdown.





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