Which type of sensor would you typically use for measuring temperature?

The use of thermocouples or RTDs (Resistance Temperature Detectors) for measuring temperature is well-established in various industrial and laboratory settings. Thermocouples operate on the principle of generating a voltage proportional to the temperature difference between their junctions. This allows for a wide range of temperatures to be measured, often in harsh environments. They are robust and inexpensive, making them suitable for various applications.

RTDs, on the other hand, provide highly accurate and stable temperature measurements. They work by correlating the resistance of a metal (usually platinum) to temperature, allowing for precise readings over a narrow range of temperatures. RTDs are well-suited for situations where accuracy is crucial.

In contrast, photoelectric sensors are primarily used for detecting objects or measuring the distance or presence of an object based on light reflection, while magnetic sensors are geared towards detecting magnetic fields or position sensing. Ultrasonic sensors operate using sound waves to measure distance or detect objects, rather than measuring temperature. Hence, thermocouples or RTDs are the correct choice, as they are designed specifically for temperature measurement applications.