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Contamination Monitoring Sensor

The CMS in-line contamination monitor automatically measures and displays particulate contamination, moisture and temperature levels in various hydraulic fluids. It is designed specifically to be mounted directly to systems, where ongoing measurement or analysis is required, and where space and cost are limited.


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Product Details

Formats ISO 4406:1999, NAS 1638, ES4059E Table 2, AS4059E Table 1, ISO 11218
Accuracy ± 1/2 code for 4, 6, 14 μm (c), ± 1 code for larger sizes
Calibration Each unit individually calibrated with ISO Medium Test Dust (MTD) based on ISO 11171
(1999) on equipment certified by IFTS.
Hydraulic Fluid Compatibility Mineral oil & petroleum based fluids (consult RMF Systems for other fluids)
Flow Rate 20-400 ml/minute
Viscosity Range max. 1000 cSt
Fluid Temperature -25° C to +80° C
Max Working Pressure 420 bar
Electrical Supply Voltage 9 – 36V DC
Seal Material FPM (Viton) – Contact Des-Case regarding any fluids that are incompatible with FPM seals
Test Time Adjustable 10 – 3600 seconds, factory set to 120 seconds
Moisture Sensing % RH (Relative Humidity) ±3%
Temperature Measurement ±3° C
Flow Rate Measurement Indication only
Data Storage 4000 tests
Communication Options RS 485, MODBUS, CANBUS, 4-20 mA
Ambient Temperature -25° C -to +80° C or -25° C to +55° C for K version
IP Rating IP 65/67 versatile IK04 Impact protection
Physical Dimensions 123(H) x 142(W) x 65(D) mm
Weight 1,15 kg


Water and Temperature Sensor

The water sensor option measures water content using a capacitive RH (relative humidity) sensor. The results is expressed as percentage saturation. 100% RH corresponds to the point at which free water exists in the fluid, i.e. the fluid is no longer able to hold the water in a dissolved solution.

All CMS units are supplied with software to download automatically new results as they are generated, provided the test is done while being directly controlled by the software. Or alternatively historical results can be downloaded form the CMS’s inbuilt memory. The CMS memory has space for around 4000 log entries, when full, the oldest log entry is overwritten.

  • Which test are logged, and when, are determined by the log settings
  • Each log entry is time-stamped and contains the CMS serial number, so that it can be identified later.

CMS “USB-I” Connector
This is a ready-made solution for easily connecting a PC/ Laptop to the CMS.

A pressure compensated flow control valve specifically designed to fit the CMS. This may be needed if the application produces an oil flow greater than 400ml/min.

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