Why Use Temperature Transmitters Instead of …

PROCESST emperatureSensor(RTD orThermocouple)"Weak" Low-Level Signal(ohm or mV) Readout andControl SystemSensor Lead andExtension WireTerminationsPROCESST emperatureSensor(RTD orThermocouple)"Strong" High-Level Signal(4-20mA) Readout andControl SystemTemperature transmitter +PS-PS1234 TDYT ransmitters vs. Direct WiringWhen making Temperature measurements, two wayshave traditionally been employed to get processreadings back to a monitoring and control method is to utilize sensor extension wiresto carry the low-level signals (ohm or mV) generatedby field-mounted RTD or thermocouple sensors(Figure 1). Another is to install Temperature trans-mitters at or near the measurement point. Thetransmitter amplifies and conditions the sensorsignal, and transmits it over a twisted wire pair backto the control room (Figure 2).

Why Use Temperature Transmitters Instead of Direct Wiring? The Interface Solution Experts • www.miinet.com Page 3 Figure 4. Sensor-to-Transmitter Trimming compensates for deviations

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