In order to make the principle of temperature control, temperature controller is divided into:

A sudden jump temperature controller:

All kinds of thermostat device models referred to as KSD, such as KSD301, KSD302 etc., the temperature controller is a new type of double metal sheet temperature controller, mainly as a variety of electric products with overheat protection, usually connected in series with a thermal fuse, thermostat device as a level of protection. The thermal fuse is jump temperature controller in the sudden loss of Lou or resulted from the failure of electric heating element when the temperature is too high, as the two level of protection, effectively prevent the burning electric heating element and the consequent fire accident.

Two, liquid temperature controller:

When the temperature of the controlled object is changed when the thermostat temperature within the Department of material (usually liquid) to produce the corresponding physical phenomenon of expansion and contraction (volume change), the membrane box connected with the temperature of the expansion or contraction. The lever principle is used to drive the on-off action of the switch to achieve the purpose of temperature control, the temperature control is accurate, stable and reliable, the temperature difference is small, the temperature control range is large, and the overload current is large. Liquid temperature controller is mainly used in household appliances industry, electric heating equipment, refrigeration and other temperature control field.

Three, pressure type thermostat,

The thermostat is filled by closed temperature refrigerant temperature and capillary, the controlled transition temperature changes for the spatial variation of pressure or volume, temperature reaches the set value, the elastic element and the transient dynamic mechanism, automatic close contact, in order to achieve the purpose of controlling the temperature automatically. It consists of micro switch temperature, temperature setting body, perform opening and closing or automatic door is composed of three parts. The pressure type temperature controller for refrigeration equipment (such as refrigerators and freezers etc.) and heating device etc..

The above is a common mechanical thermostat.

Four, electronic temperature controller,

Electronic temperature controller (resistive) method is adopted to measure the resistance temperature, generally use white gold, copper, tungsten and other thermistor as temperature resistance, the resistance of each has its advantages that point. Most commonly used in home air conditioning thermistor type. Electronic temperature controller has the advantages of stability, small size, and is now being used in more and more fields.

Five, working principle

The working principle of the temperature controller is that the temperature of the environment is automatically sampled and monitored by the temperature sensor, and the control circuit is started when the ambient temperature is higher than the control setting value. If the temperature is still rising, when rising to the set of alarm temperature limit, start the alarm function.

When the controlled temperature can not be effectively controlled, in order to prevent the destruction of equipment can also be used to stop the operation of the function of the trip. The utility model is mainly used for various high and low voltage switch cabinet, dry type transformer, box type transformer substation and other relevant temperature application fields in the power sector.