It is a type of temperature gauge that uses a long, flexible capillary tube to connect a temperature-sensing bulb to a display dial.
Working Principle: The thermometer operates on the principle of thermal expansion. The bulb contains a gas, typically nitrogen, that expands or contracts with temperature changes. This change in pressure is transmitted through the capillary tube to the Bourdon tube inside the gauge, which then moves the pointer to indicate the temperature.
Key Components: The main components are the sensing bulb, the capillary tube, and the gauge with the dial.
Applications: Capillary thermometers are used in various industrial and commercial applications where the temperature needs to be measured from a distance.