3800 00090070 Sensors, Transducers

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Temperature sensors are designed to respond to changes in temperature by producing a corresponding output in a variety of ways. One form of temperature sensing is thermostat. The word thermostat is derived from two Greek words, “thermo” which means heat, and “stat” which means stationary. A thermostat is basically a device that can detect temperature changes and activate or deactivate a heating or cooling system. There are two main types of thermostats: mechanical and electronic.

Mechanical thermostats are the most common type of thermostat found in homes and offices, and they are the simplest to comprehend. The mechanism of a mechanical thermostat is simple yet effective - it contains a bi-metal coil whose expansion and contraction keeps the temperature constant. Depending on the type of thermostat, the bi-metal coil can be set to regulate the temperature at different levels. For example, it can be set to turn on the heater when the temperature drops below a certain level, and it can be set to turn off the heater when the temperature rises above a certain level.

The operating principle of the mechanical thermostat remains the same no matter how it is used. When the temperature of the surrounding environment increases, the bi-metal coil expands in response and triggers the contact points to close. When the temperature of the environment decreases, the bi-metal coil contracts and the contact points open. This is the cycle that keeps the temperature at the desired level.

Mechanical thermostats are inexpensive, reliable and have a long lifespan. Because of this, they are still the most commonly used type of thermostat today. They are reliable even in extreme temperatures and can be used in a variety of applications, including air conditioning systems, refrigeration systems, and heating systems. They can also be used in general temperature control applications such as greenhouses and fish tanks.

Understanding the working principle of mechanical thermostats is crucial for the proper operation of any temperature-sensitive device. They are used in a variety of settings, and knowing the fundamentals of how they work will ensure that they are used efficiently and effectively. With the proper understanding of how they work, they can provide a reliable and cost-effective way to maintain temperatures at desired levels.

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