What device is used to measure temperature in a steam system?

The device used to measure temperature in a steam system is a thermometer. In steam systems, temperature measurement is crucial because the temperature of the steam affects its pressure and state, which in turn influences the efficiency and safety of the operation. Thermometers can come in various forms such as liquid-in-glass, bimetallic, or digital types, each providing accurate readings of the temperature of the steam.

In contrast, a manometer is designed to measure pressure rather than temperature, making it unsuitable for this application. A barometer measures atmospheric pressure and is not relevant to the direct measurement of temperature within a steam system. Similarly, a flow meter is used to measure the flow rate of fluids, not their temperature. Hence, the thermometer is the appropriate choice for accurately gauging temperatures in steam systems.