What does the SKF OilCheck TMEH 1 measure?
The SKF OilCheck TMEH 1 measures the change of the dielectric constant of oil. As a consequence of contamination (by water, metal particles or dirt particles) and by electrochemical changes (oxidation) that occur in oils, the dielectric constant of the oil changes. This change in dielectric constant can be used as an indication and sometimes a measure of deterioration of oil. The effect of the individual contaminants and electrochemical changes is discussed below.
Water and engine coolant:
The dielectric constant of a mineral oil is typically 2.1 and the dielectric constant of water is typically around 60, depending on the temperature, which is about a factor 30 higher than the oil. This means that contamination of the oil with water or engine coolant will cause a rapid increase of the dielectric constant of the mixture. Generally a level of 1000 ppm water or higher in oil will lead to a significant increase of the dielectric constant.
Oil oxidation:
Oil oxidation, or depletion of antioxidant additives, will lead to a gradual increase of the dielectric constant of the oil.
Metal particles:
Metal particles are conductive and will lead to a strong increase in the dielectric constant. As the metal particles are polar, they will not stay in the oil, but move to the sensor surfaces. This can show as a step-wise (small jumps) increase of the reading during the measurement.
Dust particles:
Dust particles in oil will lead to an increase in the dielectric constant of the oil. Generally dust levels of ISO 19/16 or higher will lead to a significant increase of the dielectric constant in oil.
Fuel:
Fuel is difficult to detect because the dielectric constant of petrol or diesel fuel is very close to the dielectric constant of mineral oil. Fuel contamination does normally cause a slight decrease of the dielectric constant and can hence hide other forms of dilution (such as by water).
The increase of dielectric constant is usually not proportional to the degree of oil deterioration. At larger degrees of deterioration and pollution, the dielectric constant will not increase much more.The TMEH 1 OilCheck detects and measures the dielectric constant of oil. By comparing the measurements obtained from used and unused oils of the same brand, the SKF OilCheck is able to determine the degree of change in the condition of the oil. Dielectric change is directly related to the degradation and the contamination level of the oil and will allow the user to achieve optimised intervals between oil changes and detect increased mechanical wear and loss of the oils lubricating properties. To facilitate trending the instrument is equipped with a numerical read-out. Oil Check by SKF
Through its comparative operation OilCheck is able to show changes in oil condition affected by water content, fuel contamination, metallic content and oxidation, to within a typical repeatability factor of better then five per cent. These results in turn provide an indication of the loss of lubricating properties of the oil and also of and mechanical wear in the equipment in which the oil is used. The TMEH 1 is a compact (250mm x 95mm x 32mm) unit that will last for more than 150 hours or 3,000 tests on one 9V alkaline battery.
Applications:
Diesel Engines
Gasoline Engines
Natural Gas Engines
Natural Gas Turbines
Automatic Transmissions
Any other equipment using petroleum or synthetic lubricants
Features:
Shows changes in oil condition affected by such things as:
Water content
Fuel contamination
Metallic content
Oxidation
Hand held and user friendly
Numerical read-out to facilitate trending
Download Data Sheet
Download User's Manual
Technical data
Suitable oil types: mineral and synthetic oils
Repeatability: better than 5%
Read-out: green/red grading + numerical value (0 - 100)
Battery: 9V Alkaline IEC 6LR61
Battery lifetime: > 150 hours or 3,000 tests
Dimensions: 250 x 95 x 32 mm (9.8 x 3.7 x 1.3 in) (instrument)
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Carrying case
The instruments are packaged in a light, durable aluminum carrying case for industrial environments.
Style: Riveted construction
Weight: 2,6 kg (5.7 lb.) case only
Dimensions:
– Length: 450 mm (18 in.)
– Width: 320 mm (13 in.)
– Depth: 150 mm (6 in.)
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