Thermostat, according to the temperature change of the working environment, physical deformation occurs inside the switch, so as to produce some special effects, a series of automatic control elements that produce on-on or disconnection actions, or different principles of electronic components in different temperatures and working states to provide temperature data to the circuit, so as to collect temperature data from the power circuit. The thermostat is to operate the temperature of the control object to the required temperature, and this process is temperature control.
Temperature controllers can be divided into:
1. Mechanical temperature controller is divided into: vapor pressure temperature controller, liquid expansion temperature controller, gas adsorption temperature controller, and metal expansion temperature controller.
Among them, the vapor pressure temperature controller is divided into: inflatable type, liquid-gas mixed type and liquid-filled type. The mechanical temperature controllers of household air conditioners are mainly based on this type of temperature controller.
2. Electronic temperature controllers are divided into: resistance temperature controllers and thermocouple temperature controllers.
How the temperature controller works:
1. Vapor pressure type temperature controller
The action of the temperature controller bellows acts on the spring, the elastic force of the spring is controlled by the knob on the control board, and the capillary is placed at the air outlet of the indoor air conditioner to inhale the air and react to the temperature of the indoor circulating return air. When the room temperature rises to the set temperature, the thermostat gas in the capillary tube and the bellows expands, so that the bellows elongates and overcomes the elastic force of the spring to connect the switch contacts, at this time the compressor runs and the system is refrigerated, until the room temperature drops to the set temperature, the thermostat gas shrinks, the bellows shrinks and the spring acts together, the switch is placed in the disconnected position, and the motor circuit of the compressor is cut off. In this way, the action is repeated to achieve the purpose of controlling the temperature of the room.
2. Electronic temperature controller
The electronic temperature controller (resistive type) is measured by the method of resistance temperature sensing, and generally uses platinum wire, copper wire, tungsten wire and semiconductor (thermistor, etc.) as the temperature measurement resistor, and these resistors have their own advantages and points. Most of the sensors in the temperature controller of household air conditioners are thermistors.
The refrigerator temperature controller is mainly composed of a feedback circuit and a comparator. When the temperature in the box is set, the temperature in the box will be measured with a thermoresistor, and when it is higher than the set temperature, the power will be increased, refrigeration, and vice versa; If you keep doing this, you will reach the set temperature.
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RRKC Thermostat – The working principle and main features of the pop-up thermostat
How it works
The sudden jump thermostat is a kind of bimetal disc after constant temperature as a heat-sensitive reaction component, when the temperature of the main part of the product increases or decreases, the heat generated is transferred to the bimetal disc, and when the operating temperature is set, it acts quickly, and the contact is broken through the action of the mechanism.
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Key features of the RLC thermostat:
Thermocouples, RTDs, analog and other signals are freely inputted, and the range can be set freely;
The software zeros the full degree, the cold end measures the temperature separately, the amplifier is self-stabilizing, and the display accuracy is better than 0.5%FS;
Fuzzy theory combined with traditional PD method, fast and stable control, advanced tuning ...
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RHK thermostat - the thermostat shows the reasons for the deviation between the temperature and the actual temperature and the solution
The thermostat shows a nonlinear relationship between the temperature and the actual temperature deviation:
(1) The input type of the thermostat is selected incorrectly;
(2) There is no calibration or calibration error in the analog input;
(3) There is interference in the thermostat;
(4) There is interference with thermocouples;
(5) The use of quality is not ...
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Parameter setting operation of RLC temperature control table CH402
Model: CH402FS01-8*HN (for PECVD temperature control)
1) Single press SET: SV can be set (set temperature manually)
2) Press and hold the SET button for 2 seconds, ALI=1000 (absolute alarm temperature setting) and then press the SET button, ATU=1 (self-defining, self-interpreting a set of PID parameters) to exit ...
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RKC level gauge - buoy level gauge structure composition
The level gauge is composed of five parts: float, traction cable, guide pulley, hammer pointer, display ruler or magnetic flap.
1. Float: The float is welded with two stainless steel (or carbon steel) fasting cones and one stainless steel (or carbon steel) fasting cylinder.
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Specifications and models of RKC thermostats
CH102 (48×48×100mm)
CH402 (48×96×100mm)
CH902 (96×96×100mm)
1. RH400 size: 48*96, depth 60, about 250g
1. Thermocouples: K, J, R, S, B, E, N, T, W5RE/W6RE, PL‖, U, L
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RK thermostat - the use and adjustment of temperature control instruments
1. Set temperature: Press the SET button to set or check the temperature set point. Press the SET button at the beginning of the digital tube character flashing, indicating that the appearance has entered the setting state, press the △ key to add the set value, press the v key to decrease the setting value, press and hold the △ key or √ key The data will change rapidly, press the SET key again ...
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RKC Level Gauge – The correct way to use the float level gauge
(1) Before use, first check whether the level gauge is within the verification cycle, otherwise, it should be calibrated, and replaced in time if it is unqualified.
(2) The sensor should be installed horizontally, and the length of the lower entry should meet the technical requirements.
(3) The connection between the sensor and the explosion-proof junction box should be tightened and tightened.
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RRC thermostat - the principle of sudden jump thermostat, how to judge the good or bad?
1. What is the principle of the sudden jump thermostat?
The sudden jump thermostat is a kind of thermostat, which is a series of automatic control elements that are physically deformed inside the switch according to the temperature change of the working environment, resulting in some special effects and on-off action. Sudden jump ...
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RKC thermostat wiring needs to pay attention to
Wiring Notes:
1. For thermocouple input, the corresponding compensation wire should be used.
2. RTD input, 3 wires with low resistance and no difference should be used.
3. The input signal line should be far away from the power line of the instrument. Power supply and load lines to avoid noise interference.
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Causes and treatment methods of inverter overvoltage
1. According to the theory of cutting off the overvoltage, when the transformer is cut off, the current in the transformer inductance cannot be abruptly changed, and the stored magnetic field energy forms a vibration between the excitation inductance of the transformer and the ground capacitor, and the overvoltage occurs.
2. Transformer ...
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RLC Thermostat - Introduction to the function of mechanical temperature control
1. The temperature setting is set by the knob, which is convenient and intuitive 2. It can be directly installed on the standard junction box on the wall.
3. Beautiful appearance and reliable performance.
4. The switch adopts toggle type, which feels comfortable and has a long life.
5. It can control two-wire or three-wire electric (ball...
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Introduction to the functions of the RKC temperature control meter
(1) RH400 size: 48*96, depth 60, about 250g
Details:
●A variety of input types are available:
1) Thermocouples: K, J, R, S, B, E, N, T, W5RE/W6RE, PL‖, U, L
2) Temperature measurement RTD input: PT100, JPT100...
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Common faults and analysis of thermostats
Common faults of thermostats
1. There is no display when the power is on. This type of problem first determines whether the power supply is available and whether the power supply matches the power supply required by the thermostat, and then checks whether the wiring is secure. The problem is still there, then it is the problem of the thermostat itself.
2. There is a display, and the control is wrong. This...
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RKC Level Gauge – How to properly use a plug-in float level gauge for level measurement
1. Select the appropriate level gauge
First of all, it is necessary to choose the appropriate level gauge. The following factors should be taken into account in the selection of a level gauge:
Measure the properties of the medium: e.g., temperature, pressure, viscosity, corrosiveness, etc.
Measuring range: i.e. the height range of the liquid ...
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RRKC thermostat wiring installation and some precautions
The rkc controller was developed by Japan and is mainly used in plastics and stoves. Of course, it is also widely used in China's industry, there are many people who do not know much about the rkc controller, and some even feel unfamiliar.
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RRKC Thermostats – Considerations for Instrumentation Maintenance and Maintenance
There are many types of instrumentation and have a wide range of applications in many fields. Because of this, there are many problems with the failure of instruments in the process of use, so it is necessary to pay more attention to the repair and maintenance of instruments and meters, which can effectively improve the performance of instruments and meters, and can extend the performance of instruments and meters.
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RK Thermostat - Part of the LCD shows the status quo of floor heating thermostats
1) The LCD interface is too large or the display symbols are not proportional or standard.
2) The terminal blocks or circuits (components) that control the output cannot withstand large currents.
3) The cable of the external sensor (ground probe) is a thin and flexible wire, which cannot be inserted into the embedded pipe, and it is also a hidden danger for future maintenance.
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What are the common devices for RKC thermostats – digital displays?
In a variety of electronic control equipment, digital display has become an indispensable and important link. The electronic devices and corresponding driving circuits used for digital display are called digital displays.
Commonly used digital displays include glow digital tube displays, fluorescent digital tube displays, projection ...
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RKC thermostat - introduction of the three output modes of the thermostat
The first output method is relay output, which is output for temperature control through the switching signal of the relay on/off, which is used to directly control the load less than 5A, or directly control the contactor and the intermediate relay, and control the high-power load externally through the contactor.
The second ...
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