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Temperature sensors, also known as thermostats, are devices used to measure the temperature of air, fluids, and other materials. The two main types of temperature sensors are mechanical and electronic. This article will discuss the application field and working principle of mechanical thermostats.

Mechanical thermostats are most commonly used in industrial and commercial settings to regulate temperature by controlling the operation of heating, ventilating, and air conditioning (HVAC) systems. They generally work by using a bimetallic strip or diaphragm to detect changes in temperature and then actuate a valve, switch, or relay based on a preset temperature threshold. Mechanical thermostats can be set to turn on or off based on an adjustable temperature setting. The device uses a thermally sensitive element to respond to changes in temperature, which triggers a series of actions that open or close the valves or switches.

The two main types of mechanical thermostats are bimetallic strip and diaphragm. Bimetallic strip thermostats rely on the principle of metal expansion. Thermistors, found in many household items, work on the same principle. When exposed to heat, metals typically expand at a different rate. This difference in expansion rate produces a reaction that can be readily detected. Because of their low cost and durability, bimetallic strip thermostats are commonly used to control the temperature in many applications, such as ovens and air conditioners.

Diaphragm thermostats rely on the principles of gas or liquid expansion. When heated, a gas or liquid expands and exerts pressure on a flexible diaphragm. This pressure is then used to open or close valves, switches, or relays. Diaphragm thermostats are used in high temperature applications, where temperatures can reach up to 1800°F (982°C). They are also often used to control complex systems, such as refrigeration systems and boilers.

In addition to controlling temperature, mechanical thermostats can also be used for other applications. For example, in cars, they can be used to control the speed of the engine. Similarly, in industrial applications, they can be used to regulate the flow of a liquid or gas. Mechanical thermostats have been used for years in many industrial and commercial settings, and with the advancement of technology, they have become increasingly reliable and efficient.

In conclusion, mechanical thermostats are reliable and widely used devices to regulate temperature in many different applications. They work by using a bimetallic strip or diaphragm to detect changes in temperature and then actuate a valve, switch, or relay as needed. Bimetallic strip thermostats are used in many household items, and diaphragm thermostats are used in high temperature applications. They can also be used to control the speed of an engine or flow of a liquid or gas. With their low cost and durability, mechanical thermostats are a good option for many applications.