2.1LEVEL SWITCHING

The thermal differential created between the heated and reference unheated RTD pair is a function of the liquid or gas medium with which the sensor is in contact.

The point level measurement application uses the heat transfer differences between two media to detect liquid level. For example, air has a relatively poor heat transfer characteristic so the heated sensor will become relatively hot. If the sensor is then immersed in water, the relatively high heat transfer characteristics of water will cool the heated RTD surface causing a decrease in the signal output.

This same rational applies for any two media in contact with the sensor. Each medium will have its own characteristic heat transfer properties. As long as there is a reasonable difference in the heat transfer properties between the two media, the Innova-Switch™can discriminate between them. Figure 2A shows the relative signal output of the Innova-Switch™sensor to a range of different media. The maximum difference in output occurs between vacuum and liquid metal. However, a significant difference occurs between water and hydrocarbon liquids so the Innova-Switch ™ can be used to detect a water/hydrocarbon liquid-liquid interface. In general, the interface between any two media with differing heat transfer properties can be detected.

Thermal Differential Theory of Operation

The heated RTD responds to the heat transfer coefficient of the media with which it is in contact. Gases with low heat transfer result in a high differential temperature between the heated and reference tips.

Note: Probe tips contain matched RTD’s one of which is self-heated with about 400mw of power. The other provides temperature compensation.

When the heated tip makes contact with a liquid with higher heat transfer the differential temperature drops and the lower differential results in a switch trip to indicate liquid.

IM-215 Rev-A.1

Series Innova-Switch™

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Sierra 215 manual Thermal Differential Theory of Operation, Level Switching
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215 specifications

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