The thermostat is used to automatically turn on and off various heating equipment, set and adjust the room temperature, which can automatically adjust the room temperature according to the pre-set program in the case of someone or no one; to make it reach a comfortable temperature.

The working principle is to automatically sample and instantly monitor the ambient temperature through the temperature sensor, and the control circuit starts when the ambient temperature is higher than the control set value, and the control return difference can be set. If the temperature is still rising, when it rises to the set over-limit alarm temperature point, the over-limit alarm function is activated. When the controlled temperature can not be effectively controlled, in order to prevent the destruction of the equipment can also stop the equipment to continue to run through the function of tripping. It is mainly used in various high and low voltage switchgear, dry-type transformers, box-type substations and other related temperature fields used in the electric power sector.

The main role: in Europe the vast majority of cases is the thermostat is a wall-hanging stove must accessories, both one with one at the same time delivered to the user, and equipped with the thermostat is mostly intelligent thermostat. In the country, has been installed in operation and is being installed and commissioned ready to put into use nearly 95% of the wall-hung boilers are not first equipped with any form of simple or intelligent thermostat. The room heating system is equipped with thermostats, especially intelligent thermostats, is an extremely prominent and most important link in the comprehensive system of energy-saving heating.

Features of thermostat

Convenience: automatic timing every day in advance or delayed switch to adjust the wall-hung fireplace, eliminating the need for manual operation, the most necessary for working families.

Comfortable: automatic adjustment of room temperature at each time of the day, eliminating the embarrassment of getting up in the morning and waiting for the room to warm up after coming home from work.

Gas saving: change the backward rough water temperature control to advanced and accurate room temperature control, coupled with the time-slotted room temperature on-demand operation, without open day and night burning gas heating.

Rest assured: when the room temperature is too low forced to start the wall-hung boilers, only a very small amount of gas, it is safe to protect the room from freezing.

There are many classifications of thermostats, the following are classified from several different aspects.

1, according to the different detection methods (measuring temperature) is mainly divided into room temperature type, ground temperature type and dual temperature thermostat.

Room thermostat: through the thermostat housing set up temperature-sensing probe to detect the installation location of the air temperature, as a basis for automatic control of the system circuit on and off equipment.

Ground temperature thermostat: through the external probe to detect the temperature of the installation location, as a basis for the system circuit on and off automatic control equipment.

Dual temperature thermostat: through the thermostat built-in temperature sensor probe to detect the installation location of the air temperature, while the external probe (Figure 3) to detect the installation location (ground) temperature, to ensure that the ground temperature is not higher than the temperature limit, based on the built-in probe detection data for the system on and off automatic control equipment.

2, according to the appearance of the thermostat mainly has the following types: ordinary dial wheel type, ordinary button type, advanced intelligent programming LCD type.

Ordinary dial wheel type and ordinary button type thermostat is relatively simple, according to the user's needs can be adjusted directly. Advanced intelligent programming LCD type thermostat can start heating at a predetermined time, and can be set to 4 different temperatures for 4 time periods per day (some can be multiple time periods with multiple different temperatures). The general factory setting is suitable for most situations and reduces the trouble of user setting.

When the room is unoccupied, it can be set to a lower temperature. This reduces energy consumption and improves comfort. Advanced intelligent thermostats have an adaptive function that automatically calculates the system start time in order to achieve the desired temperature at the time you set. Generally the system is first powered on for 3 days before the adaptive function can reach familiarity with the surrounding environment and achieve the desired adaptive function. With the popularity of LCD touch screen, the thermostat has also applied touch screen in recent years.

3, according to the different temperature-sensitive materials are divided into mechanical (bimetal) thermostats and electronic thermostats (PTC and NTC).

Mechanical thermostats work: two pieces of alloy with different temperature expansion coefficients feel the room temperature after bending deformation. The alloy piece with the larger expansion coefficient pushes the alloy piece with the smaller expansion coefficient to produce displacement, which pushes the contacts to close and break to realize the energization and de-energization of the thermostat.

Electronic thermostat working principle: electronic thermostat is now commonly used PTC or NTC material as a temperature sensor, the temperature digital conversion into a current signal, by the chip analysis later control system on and off.

Through the above introduction can be seen, the type of thermostat shows a diversified trend, but the traditional room thermostat independent control is still the most important control method at present and even in recent years. When choosing a thermostat need to choose according to the function of the room and their needs, good quality and stable operation is the most important.