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Engines are considered to be complex pieces of machinery and thoroughly testing them means testing many different variables. How much air is the engine taking in? How’s the noise level?

All these measurements need specialist equipment. However, the trickiest to measure is oil temperature.

It is essential to control engine oil temperature since it has a particular working range. If it is too cold, the engine will fail to be properly lubricated. If it is too warm, the viscosity of the oil will be reduced- and again the engine will suffer.

Oil temperature is also expected to change based on how hard the engine is working. Thus, it is necessary for the measurement to be continuous.

The type of sensor needed for this job must comprise of three closely-related qualities:

It is also essential for the sensor to be flexible enough so it can be inserted deep into a duct where it can reach the oil. This makes popular rugged equipment such as thermowells and metallic industrial probes unsuitable. These devices would not be affected by chemical alteration by the engine oil, and they are not flexible enough for use inside an engine oil duct.

In order to offer a straightforward solution, Omega Engineering has developed three types of specialist probes for this application. Each integrates a popular type of temperature sensor: thermocouple, thermistor or RTD sensors.

The probes are perfect for measuring engine oil temperature, being:

All three probe types ship with stripped ends as standard.

The HSRTD range of hermetically sealed RTD probes has been built around the popular PT100 platinum-based sensor. RTDs offer exceptional stability, linearity, accuracy and chemical resistance.

Range options include length up to 5 m, and a choice of Class 1/3 DIN, Class A and Class 1/10 DIN versions with stripped ends. A PT1000 RTD version and a -200 °C version are also available.

Thermistors are among the best choices for point sensing and sensitivity, although they provide narrower temperature ranges than other sensor types. The Omega HSTH-44000 Series of hermetically sealed thermistors measure from -80 °C to +150 °C, which is ideal for several engine oil applications.

The range provides three models with specialized resistance ratings: 2k252, 5k and 10k ohm. Each model is one meter long.

Thermocouples are generally selected for their low cost, high-temperature operation and fast response times. The Omega HSTC Series of hermetically sealed thermocouples is rated to 250 °C (482 °F). Range options include Type T and Type K connector models, in lengths of 1, 2 and 3 m. Male Type T and K connector accessories are also available.

This information has been sourced, reviewed and adapted from materials provided by OMEGA Engineering Ltd.

For more information on this source, please visit OMEGA Engineering Ltd.

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OMEGA Engineering Automotive. (2018, August 29). Using Sensors to Measure Engine Oil Temperatures. AZoSensors. Retrieved on May 29, 2022 from https://www.azosensors.com/article.aspx?ArticleID=819.

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