Final answer:
The frequency of calibration for temperature measuring devices varies based on the device's type, usage, required precision, and industry standards, but is often recommended annually or when accuracy is doubted. regular intervals recommended by the manufacturer, typically annually or whenever accuracy is in question.
Step-by-step explanation:
The frequency of calibration for temperature measuring devices depends on several factors, including the type of thermometer, its usage, the precision required for measurements, and the specific guidelines set forth by the industry and regulatory standards. Fireman Jason Ormand uses a pyrometer, which measures infrared radiation to gauge temperatures, and is a non-contact device often used for its quick readings and convenience. Figure 20.15 illustrates another type of thermometer that employs a thermistor whose resistance changes with temperature. which is used as a reference standard because it provides highly accurate measurements based on the proportional relation between temperature and gas pressure.
Temperature scales such as Fahrenheit, Celsius, and Kelvin are well-defined scales used to measure temperature. To establish these scales, two reproducible temperatures are often used: the freezing and boiling points of water at standard atmospheric pressure. It is essential for thermometers to be well-calibrated because even with these reference points, different thermometers might yield slightly different results for the same temperature when not standardized. Consequently, calibration should be conducted at regular intervals recommended by the manufacturer, typically annually or whenever accuracy is in question.