Which device interfaces a temperature sensor to a measurement or control device?

• A. Temperature Transmitter
• B. Resolver
• C. BCD Display
• D. UPS

Answer: (A)

Connecting a temperature sensor to a measurement or control device requires converting and conditioning the sensor’s signal into a standard form that the controller can read reliably. A temperature transmitter does exactly this: it takes the raw output from a sensor like a thermocouple or RTD, performs necessary conditioning (scaling, linearization, isolation, and sometimes excitation), and outputs a standardized process signal such as 4-20 mA or 0-10 V. This makes it possible to transmit accurate temperature information over distance to a DCS, PLC, or other control system, while protecting both ends from noise and electrical interference. The other devices have different roles: a resolver measures angular position, a BCD display simply shows numeric digits, and a UPS provides backup power, not interfacing or conditioning sensor signals for measurement or control.