WATER CONTENT

Measuring WATER in hydraulic and lubricating fluids

In minerial oils and non-aqueous fire resistant fluids water is undesirable. Mineral oil usually has a water content of 50-300ppm which it can support without adverse consequences.

Once the water content exceeds about 500ppm the oil starts to appear hazy.
Above this level there is a danger of free water accumulating in the system in areas of low flow. This can lead to corrosion and accelerated wear.

Similarly, fire resistant fluids have a natural water content which may be different to mineral oil. (From North Notts Fluid Power Centre)

 

PML2-W Fluid System monitoring product

PML2-W - the in-line fluid contamination monitor. The PML2-W incorporates

•   In-line particle counter calibrated inline           with ISO11171
•   Moisture sensor measuring % saturation           of water (RH)
•   Fluid temperature measurement The           PML2-W is designed to work up to
          400 bar working pressure.

Moisture sensor
The PML2-W provides accurate and repeatable measurements of the % saturation of water. Different oils have different saturation levels and % saturation (RH) is the best and most practical measurement. These results can be converted to PPM (parts per million), if the oil type saturation/temperature characteristics are known.

The moisture sensor is temperature compensated and the PML2-W gives a constant readout of fluid temperature.

The product can be PC/PLC controlled with an optional remote display module.

The moisture sensor consists of a humidity and temperature sensor enclosed in a specifically designed free-flow housing.

The sensor is calibrated in accordance with ISO/IEC-17025.

Saturation Levels

Since the effects of free (also emulsified) water is more harmful than those of dissolved water, water levels should remain well below the saturation point.

However, even water in solution can cause damage and therefore every reasonable effort should be made to keep saturation levels as low as possible.

There is no such thing as too little water. As a guideline, we recommend maintaining saturation levels below 50% in all equipment.

REMOTE DISPLAY OPTION FOR THE PML2 AND PML2-W

 

PML2-W
- additional FEATURES

•   Moisture sensor-measuring percentage          saturation of water.- % RH (relative          humidity)
•   Fluid temperature measurement.

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