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Moisture Content Sensor

The moisture content sensor (MCS) is suitable for most hydraulic and lubricating fluids. The high accuracy of the measurement and excellent long-term stability make the MCS ideal for online monitoring of moisture in transformer, lubricating and hydraulic fluid, as well as diesel fuel. The MCS is perfectly suitable for long-term usage in moisture levels, higher than 90% RH. Making it the perfect solution for gearboxes, thrusters and other applications where free water is a threat. By combining the MCS with other Des-Case products like a Condition Monitoring Center and Vacuum Dehydration Unit, we offer you the optimal solution for your water contamination problems.


Measurement Range 0-1 aw, 0 -100% RH
Moisture Accuracy (including non-linearity, hysteresis, and repeatability) 0 – 0.9 aw ± 0.02 aw, 0.9 – 1.0 aw ± 0.03 aw
Response time in oil flow (typical) < 1 min (dry-wet)
Temperature Accuracy at +68°F (+20°C) ± 0.36°F (0.2°C)
Electromagnetic compatibility EN61326-1
Ambient temperature -40…60 °C (-40…140 °F)
Storage temperature -40…80 °C (-40…176 °F)
Oil temperature -40…100 °C (-40…212 °F)
Oil flow Some flow recommended
Pressure Rating 0…200 bar (0…2900 psi)
Fluid compatibility¹ Petroleum based and synthetic fluids
Analog current output 0 – 20 mA, 4 – 20 mA
Analog voltage output 0 – 5 V, 0 – 10 V
Digital output RS-485, MODBUS RTU
Electrical connection M12 8-pin plug
Connection G1/2’’ BSP
Supply voltage 21-28 VDC
Supply current 20 mA + load current
Housing / protection rating Stainless steel (AISI 316L) / IP66

¹The MCS is not suitable for water-based fluids or aerospace phosphate ester hydraulic fluids.


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