TEMPERATURE DETECTION CIRCUITRYTemperature DetectorsTEMPERATURE DETECTION CIRCUITRYThe bridge circuit is used whenever extremely accurate resistance measurementsare required (such as RTD measurements).EO 1.9 Given a simplified schematic diagram of a basic bridgecircuit, STATE the purpose of the followingcomponents:a. R1 and R2b. Rxc. Adjustable resistord. Sensitive ammeterEO 1.10 DESCRIBE the bridge circuit conditions that create abalanced bridge.EO 1.11 Given a block diagram of a basic temperatureinstrument detection and control system, STATE thepurpose of the following blocks:a. RTDb. Bridge circuitc. DC-AC converterd. Amplifiere. Balancing motor/mechanical linkageEO 1.12 DESCRIBE the temperature instrument indication(s) forthe following circuit faults:a. Short circuitb. Open circuitEO 1.13 EXPLAIN the three methods of bridge circuitcompensation for changes in ambient temperature.BridgeCircuitConstructionFigure 8 shows a basic bridge circuit which consists of three known resistances, R1, R2, and R3(variable), an unknown variable resistor RX (RTD), a source of voltage, and a sensitive ammeter.IC-01 Page 10 Rev. 0
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