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What are the uses of the temperature controller
The fluid medium temperature controller realizes automatic adjustment based on the principle of thermal expansion and contraction of temperature-sensitive fluid and the incompressibility of liquid. When the control temperature rises, the thrust generated by the expansion of temperature-sensitive liquid turns the heat medium down to reduce output temperature; when the control temperature decreases, the temperature-sensitive liquid shrinks, and the heat medium is activated under the action of reset device to increase output temperature, so that the controlled temperature reaches and maintains within the set temperature range.
The bimetallic thermostat works based on the principle of thermal expansion and contraction of the object. Thermal expansion and contraction are common to objects, but different objects vary to different degrees. The two sides of bimetal are conductors of different materials. Under the changing temperature, the bimetal is bent due to the different degree of expansion and contraction. When it touches the set contact or switch, the set circuit (protection) starts to work.
Color temperature type thermostat works based on the principle that some paints will produce different colors at different temperatures, for example, liquid crystals can produce different colors at different temperatures, and then a camera-like color collector is used to provide different data to the circuit for circuit control.
Intelligent Temperature Display Controller for Power Stations
There are mechanical and electronic temperature controllers.
For mechanical temperature controller, two layers of metals with different thermal expansion coefficients are pressed together and when the temperature changes, its curvature will change. The circuit is connected (or disconnected) to make the cooling (or heating) equipment work when the curvature reaches a certain level.
For electronic temperature controller, temperature sensing devices, i.e. thermocouple, platinum resistor, are used to convert temperature signal into electrical signal, and the relay is controlled through the circuits like SCM, PLC so that the heating (or cooling) equipment work (or stop).
Mercury thermometer is also available, and the contact will be connected to mercury when reaching the specified temperature.
Classification of temperature controllers
1. Sudden jump temperature controller: The temperature controller is a new type of bimetallic temperature controller, usually connected in series with thermal fuse as a primary protection device for the overheat protection of a variety of electric heating products. The thermal fuse acts as a secondary protection device when the sudden jump temperature controller fails or causes the heating element to overheat, it can effectively prevent the burning of heating element and the resulting fire accident.
2. Liquid expansion type temperature controller: when the temperature of the controlled object changes, the substance (usually liquid) in the temperature sensing part of the temperature controller will produce corresponding thermal expansion and contraction (volume change). The bellows connected with the temperature sensing part expand or contract. Based on the lever principle, the switch can be turned on and off to achieve the purpose of constant temperature. The liquid expansion type temperature controller features accurate, stable and reliable temperature control, small temperature difference between on and off, large temperature control adjustment range, and high overload current. The temperature controllers are mainly used in temperature control applications such as household appliances, electric heating equipment, and refrigeration industry.
3. Pressure type temperature controller turns the controlled temperature into the change of space pressure or volume through the closed temperature bulb and capillary tube filled with temperature-sensitive working fluid. When reaching the set temperature value, the contacts are automatically closed through elastic elements and fast instantaneous movement mechanism to achieve automatic temperature control. It is composed of temperature sensing part, temperature setting body, micro switch or automatic damper for opening and closing. Pressure type temperature controllers are suitable for refrigeration appliances (such as refrigerators and freezers, etc.) and heaters.
4. Electronic temperature controller (resistance type) measures temperature based on the resistance temperature sensing method. Generally, platinum wire, copper wire, tungsten wire and thermistor are used for temperature measuring resistor. These resistors have their own advantages. Normally most of household air conditioners are equipped with thermistor.
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