What Are The Main Types Of Thermostats?

Different types of thermostats are used in different equipment, according to the working temperature limits and the conditions of use of the component within the heating or cooling system.

Next, we have separated the main types of thermostats found on the market according to their characteristic functions and where they should be used. Check out!

Mechanical Thermostat

This is the thermostat that works from non-electronic sensors. The most classic examples of this type of component are those that use the gas pressure principle and the bimetallic ones.


This thermostat makes use of two cast plates composed of different metals. Each one is formed by a material with a different expansion coefficient, that is, a different expansion capacity according to the heating used.

Generally, the metals used in this system are copper, iron, steel, or brass, depending on the function to be performed. Because they are made of different materials, each plate expands or compresses differently, making one smaller than the other, and, consequently, the set bends towards the smaller side.

Subsequently, electrical contact is placed at the end of the set, keeping the current flowing when the correct temperature is reached. If there is a variation in the system, the plates bend and disengage from the contact, preventing the flow of electrons.

Gas Temperature Sensor

This type of thermostat makes use of the principle of gas expansion. An ideal gas expands when heated, but in a confined place, its volume is maintained, and pressure increases. Thus, the gas temperature sensor measures the system’s internal pressure and can determine the corresponding atmosphere according to the registered unit.

Digital Thermostat

Finally, digital thermostats have several variations by region. These components use electronic sensors such as thermocouples and thermistors.

Thermistors from Blackhawk supply are items that, depending on the temperature they are at, vary in their electrical resistance. In this situation, the greater the activity within the system, the lower the registered resistance.

Thus, from the thermistor record, it is possible to determine the environment’s temperature. On the other hand, Thermocouples are equipment that uses a set of two metallic filaments of different materials, joined at the end of each other.

In this way, thermocouples record the change in the electrical potential of their tips based on temperature variation, enabling measurement. Above all, they are composed of different materials, and each thermostat is more or less indicated according to the function it will be performing and the oscillation amplitude.

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