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Temperature sensors are devices that measure and control the temperature in a wide variety of applications, such as in industrial processes, medicine, heating and cooling systems, and environmental control. Thermostats are a type of temperature sensor that interacts with the environment and controls a system based on the temperature level. Mechanical thermostats, in particular, operate with physical components such as switches and levers to sense and respond to temperature changes.

In most cases, mechanical thermostats consist of two main components – a sensing element and a control element. The sensing element is usually a thermally sensitive element that detects changes in the ambient temperature. This element is usually either a bimetallic element, or a liquid-filled bulb connected to a capillary tube. When the ambient temperature increases, the thermal element expands, causing a change in the position of the connected mechanical control element. This movement of the control element trips the switch, which changes the state of the connected electrical circuit, thereby controlling the temperature.

The most common type of mechanical thermostat is the snap-action switch, which is typically used to control electric motors, heating elements, valves, and gas appliances. These thermostats are basically composed of a bimetal snap disc, a contact, and a resettable mechanism. The bimetal snap disc is a thin disc made up of two strips of metal that are bonded together. When a temperature change occurs, the disc rapidly snaps into a new position and opens or closes the corresponding switch.

In addition to the snap-action switch, there are other types of mechanical thermostats. The diaphragm type uses a flexible diaphragm that responds to changes in temperature by altering the pressure on the internal spring. A bi-metallic strip sensing element is used to power a rotary element that open or closes a valve depending on the exact temperature reading. This type of thermostat is often used to control air flow in air conditioning systems.

Mechanical thermostats are mainly used to control the temperature in a wide variety of applications. They work by sensing temperature changes and responding to them by turning a system on or off. They are usually low-cost, reliable, and easy to install and use. However, they are not as accurate or as fast as more advanced electronic thermostats, and they become less reliable over time due to wear and tear.

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