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Sensing Moisture in Oil

Posted on July 5, 2019

When it comes to the use of hydraulic fluids and lubricants in industrial processes, the last thing you want to see is water. It interferes with machining processes and can even damage the equipment.

This is magnified when the concentrations become more extreme, at which point the water poses a serious risk to your operational processes.

Water is also undesirable in fuel oils. Stand alone fuel tanks can be at great risk of developing free water, which can damage engines and generators.

The most common means of avoiding this potential risk is by the implementation of water in oil sensors.

E+E sensors work on the basis of measuring relative humidity within your oil, allowing you to be aware of how saturated your oil is and alerting you to take action before any free water can damage your system or process.

By measuring the relative humidity, you are provided with information on the concentration of water within the solution relative to the water holding capacity of the fluid.

0% saturation within the fluid would denote an oil that is absolutely dry, whereas 100% would denote a fluid that cannot hold any more water in solution, after this point the water would appear as free water.

This type of measurement is preferential in the majority of cases, to the volumetric analysis provided by laboratories, where the absolute water content is defined in ppm, rather than as a percentage of the fluid’s total water holding capacity.

For example, mineral oils have a comparatively low water absorption capacity. This means that 500 ppm may well signify that the oil is over saturated, and action needs to be taken. Ester oils, however, have a relatively high-water absorption capacity, meaning that 500 ppm is only slightly saturated.

EE360 High-End Moisture in Oil Transmitter

Further to this the temperature of a given oil can affect the amount of water that it is capable of holding in solution. If the temperature of your oil changes, E+E sensors automatically adjust the readings. Therefore, with a % saturation reading you can be sure that the level of saturation in your oils will always be relevant to the current conditions.

By installing in-line moisture in oil monitoring you will also remove the need for bottle sampling which can be unreliable due to sample contamination, and also be expensive.

To browse our range of state-of-the-art E+E water in oil sensors, click here.

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