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Gearboxes – Controls – Hydraulics

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Gearboxes – Controls – Hydraulics

Water sensor LCCHS

Water sensor LCCHS

Application range humidity sensor LCCHS

Water is not desirable in hydraulic and lubrication media. High concentrations of water can cause serious impairment of operation and damage.

Performance features humidity sensor LCCHS

The LCCHS measures the relative humidity of the oil and thus directly indicates the degree of saturation with water:
  • 0%: Absolutely dry oil.
  • 100%: Oil is completely saturated with water. Further water is no longer dissolved and is present as free water.

In contrast to moisture analysis in the laboratory, where the water content is represented in absolute terms in ppm (parts per million), relative moisture measurement allows the saturation of the oil to be measured. The advantage of relative humidity over absolute water content is that knowledge of the oil and its saturation limit is not necessary to assess whether water is free or dissolved. Example:

  • Mineral oils (e.g. HLP) have a comparatively low water absorption capacity. 500 ppm here can mean that the oil is supersaturated and free water is present.
  • Ester oils (e.g. HEES) have a relatively high water capacity. 500 ppm here can mean that the oil is only about 15% saturated.

The behavior of relative humidity at different temperatures should also be noted: warm oil can dissolve more water than cold oil. Therefore, the relative humidity increases as the oil cools without adding more water. It is possible that when cooled to ambient temperature, a hot relatively dry oil may suddenly contain free water.

The LCCHS indicates the current saturation of the oil with water, regardless of the type of oil and temperature, and provides additional safety in the operation of equipment by providing a direct warning.

Constructive feature

The sensor is provided with a ¾” thread and can be integrated into the tank. Communication with the sensor is optionally via a serial interface or via two analog (4-20 mA) outputs.

Measuring principle Humidity sensor LCCHS

The sensor detects the relative oil humidity and temperature of the fluid. Through an oil specific calibration it is possible to calculate the absolute humidity of the fluid.

The measured values are given via RS-232 and the analog outputs.

Catalog data²:


Water sensor LCCHS_catalog_en

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1. the CAD data is provided as a zip file. The archive contains both e-drawings and STEP files.
To view the easm data you need the e-Drawings Viewer, for the STEP files a suitable CAD system.

  • 2. these data are provided in a PDF document. To view these PDF documents you need a PDF reader.

















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