RMF Systems CMS 2 - Measuring Water in Hydraulic and Lubricating Fluids

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As a policy of continual improvement, RMF reserves the right to alter the specification without prior notice.
201.028 REV 1 Date of Issue: 18 June 2018
enum
Function
Parameter
1
Start Test
None
9
Stop Test
13(0xd)
Start Test
Fixed Test Number
14
Format ISO4406
Set ISO4406 result format
15
Format NAS1638
Set NAS1638 result format
16
Format AS4059_E2
Set AS4059E Table 2 result format
17
Format AS4059_E1
Set AS4059E Table 1 result format
18
Format ISO11218
Set ISO11218 result format
11.3 Measuring Water in Hydraulic and Lubricating Fluids
From North Notts Fluid Power Centre
In mineral oils and non-aqueous fire resistant fluids water is undesirable. Mineral oil usually has a water content
of 50-300 ppm 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 oils.
Saturation Levels
Since the effects of free (also emulsified) water are 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.