Which device uses infrared radiation to detect hot spots in equipment?

The device that uses infrared radiation to detect hot spots in equipment is a pyrometer. Pyrometers operate by measuring the thermal radiation emitted by an object, allowing them to assess temperature from a distance without making direct contact with the surface. This capability is particularly useful in industrial settings where equipment can be hot and difficult to reach, helping to identify potential overheating issues.

Thermometers, while they measure temperature, typically require contact with the material being measured and do not utilize infrared radiation. Manometers are designed to measure the pressure of gases and liquids, not temperature. Calorimeters quantify heat transfer, often in chemical reactions, but do not function using infrared radiation for temperature measurement. Thus, the pyrometer stands out as the appropriate device for detecting temperature variations and hot spots through infrared technology.