Interpretation of the measurement results
HySense
®
CX 197
42
ENG
6.
Interpretation of the measurement results
Thanks to the particle monitor, you can get information about the degree of
contamination of the oil with foreign particles. The humidity sensor specifies the
dissolved humidity content directly. These variables provide direct insights into
the wear of the oil due to particles and/or humidity. If the limit values for these
variables are exceeded, you should take action.
The oil condition is a variable formed from many parameters. Limit values for
specific oil parameters depend on the respective use e.g. the components and
materials used. The type and speed of oil parameter change, in turn, depends
on the application, the specific system load, and the pressure or lubricant used.
Therefore, it is not possible to define universally valid limit values for individual
parameters.
6.1 Specific oil parameter change
If you examine the temporal change of the parameters, there are two
distinguishing criteria:
•
Quick change: the parameters change suddenly as compared to the last
measurement. Here is should be assumed that there has been a recent
event. For example, there might have been an oil change or top-up.
•
Slow change: the parameters change slowly across several
measurements. Here, it should be assumed that there is a gradual
condition change, such as happens with oil aging.
6.1.1 Viscosity
Slow increase
If the viscosity increases slowly and constantly, this indicates an oil aging due to
oxidation. There is a polymerization happening. That is, the carbon water
substance chains of the base oil are forming insoluble polymers due to reaction
with oxygen.
Caution: In addition to polymers, acids also arise during this reaction! These
can cause corrosion.
Indications of oxidation (in addition to increase in viscosity):
•
Brown color of the oil
•
The same applies for the increase of permittivity
Note
Possibilities are revealed that point to particular causes. Due to the complexity of
various oil parameters, it cannot be guaranteed that statements hold true.