System, sensor unit and method for monitoring and evaluation of liquid condition

A system for monitoring a condition of a liquid, the system comprising:

• a system inlet configured to receive contaminated liquid;
• a system outlet configured to receive filtered liquid;
• a filtration unit in fluid communication with the system inlet and the system outlet, the filtration unit comprising a filter which is configured to receive the contaminated liquid and to release the filtered liquid;
• and
• a sensor unit comprising:
• at least one sensor interface configured to:
• fluidly interface with at least one of:
• (a) the contaminated liquid flowing toward the filter;
• or (b) the filtered liquid flowing away from the filter;
• and
• measure two or more unfiltered raw signals corresponding to at least two different physical parameters of at least one of the contaminated liquid or the filtered liquid, wherein each of the physical parameters comprises at least one of:
• (a) a liquid degradation, (b) a presence of wear debris particles, (c) a particle content, (d) a particle count, or (e) a viscosity, wherein the each one of the unfiltered raw signals is associated with a mean value and a non-zero variance derived over a course of at least two measurements, the at least one sensor interface further configured to transmit said unfiltered raw signals as unfiltered transmission signals, each of the unfiltered transmission signals being derived from one of the unfiltered raw signals and having a variance equal to the non-zero variance of one of the unfiltered raw signals;
• and
• an evaluation unit operatively coupled to the at least one sensor unit, wherein:
• the evaluation unit is configured to evaluate a condition of at least one of the contaminated liquid or the filtered liquid depending on a relationship between the at least two different physical parameters;
• and
• the evaluation is based, at least in part, on the unfiltered transmission signals received from the at least one sensor unit.

A method of monitoring a condition of a liquid, the method comprising:

• providing a sensing unit for monitoring the condition of the liquid, the sensing unit comprising at least one sensor interface;
• measuring two or more different physical parameters of the liquid by use of the at least one sensor interface, wherein each of the physical parameters relates to at least one of:
• (a) a degradation of the liquid, (b) a presence of wear debris particles in the liquid, (c) a particle content of the liquid, (d) a particle count of the liquid;
• or (e) a viscosity of the liquid, wherein the at least one sensor interface provides at least two non-preprocessed raw signals corresponding to said two or more physical parameters and a mean value and a non-zero variance different from zero for each signal, the at least one sensor interface being operable to transmit the at least two non-preprocessed raw signals to an evaluation unit, the signals being at least substantially non-aggregated during a time between when the signals are being provided by the at least one sensor interface and when the signals are being transmitted to the evaluation unit;
• and
• providing an evaluation unit that is operable to receive the at least two non-preprocessed raw signals and evaluate a condition of the liquid based on a relationship between the two or more different plurality of the physical parameters.