What method uses temperature-indicating devices to monitor equipment conditions?

Thermography is the method that utilizes temperature-indicating devices, typically infrared cameras or thermographic sensors, to monitor the thermal conditions of equipment. This technique allows maintenance personnel to identify hotspots or irregular temperature patterns that could signify issues such as electrical faults, overheating components, or insulation failures. By capturing temperature variations across equipment surfaces, thermography helps in proactive maintenance and troubleshooting, ensuring that potential problems can be addressed before they lead to failures or downtime.

The other methods mentioned are specialized for different purposes. Calorimetry is concerned with measuring the quantities of heat involved in chemical reactions or physical changes, rather than monitoring equipment conditions. Hydrometry pertains to measuring the weight of water or the specific gravity of fluids, which is unrelated to temperature monitoring. Barometry focuses on measuring atmospheric pressure, providing insights into weather changes rather than equipment states. Thus, thermography stands out as the most appropriate method for monitoring equipment conditions through temperature.