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Information HOME >> News >> Information

Temperature Controller
Issuing Time:2018-07-06

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


Introduction


The fluid medium temperature controller is automatically adjusted by the principle of thermal expansion and contraction of the temperature sensitive fluid and the incompressibility of the liquid. When the control temperature rises, the thrust generated by the expansion of the temperature sensitive liquid turns off the heat medium to reduce the output temperature; when the control temperature decreases, the temperature sensitive liquid shrinks, and the heat medium is opened under the action of the reset device to increase the output temperature. So that the controlled temperature reaches and remains within the set temperature range.


The working principle of the bimetal thermostat is based on the principle of thermal expansion and contraction of the object. Heat ups and downs are commonalities of objects, but different objects have different degrees of heat rise and contraction. The two sides of the double gold piece are conductors of different materials. At different temperatures, the double gold piece is bent due to the different degree of expansion and contraction, and the set contact or switch is touched, so that the set circuit (protection) starts working.


Color temperature type thermostat, the working principle is the principle that some paints will produce different colors at different temperatures. For example, liquid crystals can be used to produce different colors at different temperatures, and then the color collector of the camera type is used to provide different data to the circuit, thereby controlling the circuit.


principle


Mechanical and electronic,


The mechanical type uses two layers of different thermal expansion coefficients to press together. When the temperature changes, his curvature changes. When bending to a certain degree, the circuit is turned on (or disconnected) to make the cooling (or heating) device. jobs.


The electronic type converts the temperature signal into an electric signal through a temperature sensing device such as a thermocouple or a platinum resistor, and controls the relay through a circuit such as a single chip microcomputer or a PLC to operate (or stop) the heating (or cooling) device.


There is also a mercury thermometer type, when the temperature is reached, there will be contacts and mercury connected.


structure


Controller


Supply voltage:


AC/DC85~264V


◆Measurement control range: Temperature -50°C~150°C Display accuracy ±0.1°C (<100°C) Detection accuracy: ±0.5°C ◆Parameter setting: Control value: full scale 0~100% Hysteresis: Temperature 1~30°C sensor Error correction: temperature -50 ° C ~ 150 ° C


Display mode: three LED digital tube display, 1 decimal place


◆ Heating control: start: temperature ≤ set temperature (lower limit); stop: temperature ≥ set temperature (lower limit) + temperature difference; ◆ fan control: start: temperature ≥ set temperature (upper limit); stop: temperature ≤ set Constant temperature (upper limit) - temperature difference


Power consumption:


≤5W


◆Load relay output capacity: AC220V/5A (resistive load) ◇ST-801S-96 type two-way ◇ST-802S-96 type four-way ◇ST-803S-96 type six-way ◆Alarm relay contact capacity: AC220V/ 5A (resistive load) All the way ◆ Dimensions: Controller 96X96X125mm sensor 75×80×28.5mm□ Installation: Embedded installation: Open 91+0.5X91+0.5mm hole on the installation panel, use the mounting bracket to connect the controller Fixed to the panel.


Double temperature


Features


The two-way temperature is digitally controlled with precise control. The button sets the control value and automatically controls the corresponding load to adjust the temperature and humidity of the environment.


Technical characteristics


Power supply voltage: AC220V, 50-60HZ


Control output: 5A, 250VAC (resistive load)


Display device: LED display


Set temperature: 0 ~ 99.9 ° C


Set the return difference: temperature 1 ~ 9 ° C,


Accuracy: temperature ± 0.5 ° C


Control method: upper limit, lower limit


Ambient temperature: -10 ° C to 70 ° C


Ambient humidity: 45 to 85% RH


Mechanical life: at least 3000,000 times


Volume: 72 × 72 × 112mm3


classification


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


1. Kick-type thermostat: The models of various snap-on thermostats are collectively referred to as KSD, common such as KSD301, KSD302, etc. The thermostat is a new type of bimetal thermostat, mainly used as various electric heaters. When the product has overheat protection, it is usually used in series with the thermal fuse, and the snap-on thermostat is used as the primary protection. The thermal fuse is used as a secondary protection when the sudden-type thermostat fails or fails to cause the electric heating element to overheat, thereby effectively preventing the burning of the electric heating element and the fire accident caused thereby. [1]


Second, the liquid-up type thermostat: when the temperature of the controlled object changes, the physical phenomenon (volume change) and the sense of the thermal expansion and contraction of the substance (generally liquid) in the temperature sensing part of the thermostat are generated. The bellows in which the warm portions are connected together expand or contract. With the principle of leverage, the switch is turned on and off, and the liquid expansion type thermostat with temperature control has the characteristics of accurate temperature control, stable and reliable, small temperature difference between start and stop, large temperature control adjustment range and large overload current. The liquid rise type thermostat is mainly used in temperature control occasions such as home appliance industry, electric heating equipment and refrigeration industry.


Third, the pressure type thermostat changes the temperature controller through the closed temperature and capillary of the internal charge temperature working medium, and changes the controlled temperature change into the space pressure or volume change. When the temperature setting value is reached, The elastic element and the fast momentary mechanism automatically close the contacts for automatic temperature control. It consists of a temperature sensing unit, a temperature setting body unit, a micro switch that performs opening and closing, or an automatic damper. Pressure thermostats are suitable for applications such as refrigeration appliances (such as refrigerator freezers) and heaters.


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


Steam type


Working principle: vapor pressure type


The action of the bellows acts on the spring. The spring force of the spring is controlled by the knob on the control panel. The capillary is placed in the air inlet of the air conditioner to absorb the temperature of the indoor return air. When the room temperature rises to the set temperature, the temperature sensor gas in the capillary tube and the bellows expands, the bellows is elongated and the switch contact is turned on against the spring force of the spring, and the compressor is operated at this time.