What Is a Temperature Controller?

Thermostat (Thermostat), according to the temperature change of the working environment, physical deformation occurs inside the switch, resulting in some special effects, a series of automatic control elements that turn on or off, or electronic components at different temperatures, Different principles of working states provide temperature data to the circuit for the circuit to collect temperature data.

Temperature Controller

Thermostat (Thermostat), according to the temperature change of the working environment, physical deformation occurs inside the switch, resulting in some special effects, a series of automatic control elements that turn on or off, or electronic components at different temperatures, Different principles of working states provide temperature data to the circuit for the circuit to collect temperature data.

Chinese name

Temperature Controller

Foreign name

Thermostat

Application area

Applied to temperature, pressure, level, capacity

Use environment

0-50

Display method

LED digital display

Working power

AC100-240V

The fluid medium temperature controller uses the principle of thermal expansion and contraction of the temperature-sensing fluid and the incompressibility of the liquid to realize automatic adjustment. When the control temperature rises, the thrust generated by the expansion of the temperature-sensing liquid turns off the heat medium to reduce the output temperature; when the temperature is lowered, the temperature-sensing liquid shrinks, and the heat medium is opened up by the reset device to increase the output temperature , So that the controlled temperature reaches and maintains within the set temperature range.

The working principle of the bimetal thermostat is based on the principle of object thermal expansion and contraction. Thermal expansion and contraction are common to objects, but the degree of thermal expansion and contraction varies with different objects. The two sides of the double gold sheet are conductors of different materials. The double gold sheet is bent at different temperatures due to different expansion and contraction. When it contacts the set contact or switch, the set circuit (protection) starts to work.

The color temperature type temperature controller works on the principle that some paints produce different colors at different temperatures. For example, liquid crystals can be used to generate different colors at different temperatures, and then a color collector such as a camera can be used to provide different data to the circuit to control the circuit.

There are mechanical and electronic

Mechanically, two layers of metals with different thermal expansion coefficients are pressed together. When the temperature is changed, the degree of bending will change. When it is bent to a certain degree, the circuit is switched on (or off) to make the cooling (or heating) equipment. jobs.

Electronic passage

According to the manufacturing principle of the thermostat, the thermostat is divided into:

I. Jump-type thermostat: The models of various jump-type thermostats are collectively called KSD, common ones such as KSD301, KSD302, etc. This thermostat is a new product of bimetallic thermostat, mainly used as a variety of electric When the product has overheating protection, it is usually used in series with a thermal fuse, and the sudden temperature controller is used as the first-level protection. The thermal fuse acts as a secondary protection for the overheating of the heating element when the sudden temperature controller fails or fails, which effectively prevents the heating element from being burnt out and the fire accident caused by it. ^[1]

Second, the liquid expansion type thermostat: when the temperature of the controlled object changes, the material (usually a liquid) in the temperature sensing part of the thermostat generates the corresponding physical phenomenon (volume change) of thermal expansion and contraction. The capsules connected with the warm part expand or contract. Based on the principle of lever, the on-off action of the switch is achieved to achieve the purpose of constant temperature. The liquid expansion thermostat has the performance characteristics of accurate temperature control, stable and reliable, small temperature difference between start and stop, large temperature control adjustment range and large overload current. Liquid expansion thermostat is mainly used in temperature control occasions such as home appliance industry, electric heating equipment and refrigeration industry.

Third, the pressure type thermostat, the thermostat will change the controlled temperature change to the change of space pressure or volume through the enclosed temperature-sensing temperature-sensing temperature package and capillaries. When the temperature set value is reached, The elastic element and fast instantaneous mechanism can automatically close the contacts to achieve the purpose of automatic temperature control. It consists of a temperature sensing part, a temperature setting main body part, a micro switch that performs opening and closing, or an automatic damper. The pressure type thermostat is suitable for occasions such as refrigeration appliances (such as refrigerators and freezers) and heaters.

Fourth, electronic temperature controller, electronic temperature controller (resistive type) is measured by resistance temperature sensing method, generally using platinum wire, copper wire, tungsten wire and thermistor as temperature measuring resistance, these resistance Each has its own advantages. Most home air conditioners use thermistors.

Temperature controller steam

Working principle: steam pressure

The action of the bellows acts on the spring. The elastic force of the spring is controlled by the knob on the control board. The capillary tube is placed at the air inlet of the indoor of the air conditioner, and responds to the temperature of the indoor circulating air. When the room temperature rises to the set temperature, the temperature-sensing agent gas in the capillary tube and the bellows expands, which makes the bellows extend and overcome the elastic force of the spring to switch on the switch contacts. At this time, the compressor runs and the system cools down to room temperature. When the temperature drops to the set temperature, the temperature of the temperature-sensing bag shrinks, and the bellows shrinks together with the spring. The switch is placed in the off position to cut off the motor circuit of the compressor. Repeat this action to achieve the purpose of controlling the room temperature.

Electronic temperature controller

Electronic temperature controller (resistive type) is measured by resistance temperature sensing method. Generally, platinum wires, copper wires, tungsten wires and semiconductors (thermistors, etc.) are used as temperature measuring resistors. These resistors have their own advantages and disadvantages. . The sensors of home air conditioners are mostly thermistor type.

Suitable for floor heating control