Sierra 215 manual Gas Or Liquid Flow

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When the sensor is inserted into a liquid or gas the heated RTD is strongly affected by the velocity of the medium. Flow past the heated RTD changes the heat transferred from the surface of the sensor. This cooling effect reduces the temperature of the sensor. The Innova-Switch™compares this change to a preset flow trip point to switch the output. Figure 2B shows the model FS4200 signal change vs. flow rate for air, light hydrocarbon liquids, and water.

The signal change vs velocity has the same general shape for all three media but the change is larger for air and the sensitive range is different for each. For air and most gaseous media the range is 0.1 to 500 feet per second (FPS). For most liquid media the range is 0.01 to 5 FPS. Appendices in section 9.0 contain flow conversion information to facilitate conversion from various units and pipe dimensions into flow velocity in feet per second.

Gas Or Liquid Flow

For a no flow condition the thermal differential between the two tips is high because of relatively low heat transfer.

Note: The fluid velocity and heat absorption ability determine the differential between the tips. Their combination determines the measurable velocity. In water velocities from 0.01 to 5 FPS are measurable, whereas in air velocities of

0.1to 500 FPS can be measured.

Flow across the tips decreases the thermal differential because of the higher heat transfer of flowing fluids. This differential is compared with the trip point.

When the lower differential matches the customer select flow velocity trip point (set point) the switch relay and red LED are tripped.

When flow is above the trip point the differential is smaller than at the set point and the

relay and Led remain tripped.

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 When Installing Your Sierra Instruments Switch Into InstallationPipe or Vessel USE a 1 1/8 Inch 28.575mm OPEN-END 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 Cleaning Intenance and Trouble ShootingTroubleshooting Special Notice Input Power Specifications TypeOperating Temperature Process ConnectionsWarranty Warranty and ServiceService 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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