What is a Capillary Temperature Switch?

A capillary temperature switch is an innovative device that is used to control the temperature of various systems or processes. It consists of two main components: a capillary tube and a snap action switch. The capillary tube contains a special fluid that expands or contracts in response to changes in temperature. This fluid’s movement then triggers the snap action switch to either open or close a circuit, thereby controlling the desired temperature range.

The working principle of a capillary temperature switch is quite fascinating. A fluid is encapsulated within a metal capillary tube, which is usually made of stainless steel for durability and resistance to high temperatures. When the temperature changes, the fluid inside the capillary tube also experiences a corresponding variation. As the fluid expands or contracts, it exerts a force on a diaphragm located at one end of the capillary tube.

The diaphragm is connected to a snap action switch, also known as a micro switch or limit switch, through a mechanical linkage. The snap action switch is responsible for controlling the electrical circuit based on the movement of the diaphragm. Depending on the design and application, the switch may either open or close the circuit when the temperature reaches a certain setpoint.

In simple terms, when the capillary temperature switch detects a temperature below or above a predetermined threshold, it acts as a control mechanism to ensure that the desired temperature range is maintained. For example, in a heating system, if the temperature drops below the setpoint, the capillary temperature switch will respond by closing the circuit, activating the heating element to restore the required temperature.

In summary, a capillary temperature switch is an essential device for controlling temperature variations. By utilizing the expansion and contraction of a fluid enclosed within a capillary tube, it enables the precise regulation of temperature. This control is achieved by linking the diaphragm’s movement to a snap action switch, which in turn opens or closes a circuit. With their widespread use across various industries, capillary temperature switches continue to play a vital role in maintaining optimal temperatures for efficient operation and improved energy management.

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Post time: Sep-26-2023