Sierra 215 manual Thermal Differential Theory of Operation, Level Switching

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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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Contents INNOVA-SWITCH Series Before Starting This manual covers the following model numbers Special NoticeTable of Contents Introduction Description Introduction DescriptionIM-215 Rev-A.1 Series Innova-Switch IM-215 Rev-A.1 Series Innova-Switch Level Switching Thermal Differential Theory of OperationFlow Switching Gas Or Liquid Flow Innova-Switch Model FS4200 Flow Response for Three Media IM-215 Rev-A.1 Series Innova-Switch Innova-Switch Models with the CE Option Switch Block Diagram Innova-Switch Switch Assembly Pipe or Vessel USE a 1 1/8 Inch 28.575mm OPEN-END InstallationWhen Installing Your Sierra Instruments Switch Into IM-215 Rev-A.1 Series Innova-Switch Electrical Installation Innova-SwitchSWITCH Local Electronics Field Wiring DiagramIM-215 Rev-A.1 Series Innova-Switch Innova Switch Flow Switch Remote Electronics Option Field WiringConnections Remote Electronics Cable TerminationInnova-SwitchSWITCH Remote Electronics Field Wiring Diagram L.E.D. and Relay Status Logic Fail-safe Innova-Switch Electronics For Optimum OPERATION, Calibration Must be Accomplished Pre-Operational Check RED Green Relay Contact Sensor Status LED Innova-Switch Electronics Calibration Level IM-215 Rev-A.1 Series Innova-Switch IM-215 Rev-A.1 Series Innova-Switch Troubleshooting Intenance and Trouble ShootingCleaning Special Notice Specifications Type Operating TemperatureInput Power Process ConnectionsService Warranty and ServiceWarranty Connector Plates Volume Flow Conversion Chart To Convert from Multiply byFlow Conversion Chart Flow of Water Through Schedule 40 Steel Pipe Options Livetap LT Variable Insertion Thermocouple Output to and 10.4 RTD Output RT IM-215 Rev-A.1 Series Innova-Switch

215 specifications

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