First, the controller works:
Haotian controller is a self-adjusting device that is realized by the principle of thermal expansion, contraction and liquid incompressibility of temperature-sensing liquid. It can make the temperature inside the box change within the specified range. When the control temperature is increased or decreased, the temperature-sensitive liquid can be correspondingly expanded or contracted to turn off or open the heat medium so as to reach the temperature rise and fall.
The controller of the temperature controller can directly control the electric valve (including the electric butterfly valve and the electric ball valve, etc.) through a simple connection. The servo amplifier can be omitted and the valve opening degree can be selected or not. The upper limit and lower limit of the valve opening can be set. Pressure, temperature, flow and other signal input.
The use of high and low temperature test chamber automatic control systems can reduce human operations and drawbacks, bring about management and technical improvements, and reliably meet the requirements of the production process. The application of DDC direct digital control system in textile air conditioning is mature. The developers have convenient programming, simple control and safe and reliable control. It allows users to conveniently conduct operations management, data management, alarm management, report management, and comprehensive management, and improve the company's new technology applications and integrated management capabilities.
Throttle temperature controller structure diagram
The working principle of the temperature-sensitive air door temperature controller is the same as the pressure-type temperature controller. It also utilizes the characteristic that the pressure of the temperature-sensing agent changes with the temperature. The conversion unit drives and changes the angle of the opening and closing of the damper to control the cold air volume of the cold room. Control the temperature of the refrigerator. It does not connect to the circuit. The freezer temperature controller controls the start and stop of the compressor.
The non-contact meter temperature measurement is based on the principle of thermal radiation. The temperature measurement element does not need to be in contact with the measured medium. It has a wide range of temperature measurement, is not limited by the upper limit of the temperature, and does not destroy the temperature field of the measured object. The reaction speed is generally faster. However, due to external factors such as the emissivity, measurement distance, smoke and dust, and moisture of the object, the measurement error is large.
Temperature instrument is usually divided into a meter and a secondary instrument. A meter is usually: a thermocouple, a thermal resistance, a bimetal thermometer, an in-situ temperature display instrument, etc. The secondary instrument is usually a temperature recorder, a temperature inspection instrument, a temperature display instrument, Temperature regulators, temperature transmitters, etc.
Second, the system verification overview:
The high and low temperature test chamber consists of a sky tank, a wind circulation system, a refrigeration system, a heating system, and a humidity control system. The air circulation system adopts a structure that can adjust the direction of the air supply; the humidification system uses two kinds of humidification and surface evaporation; the cooling and wet system adopts the air conditioning mode refrigeration structure; the heating system adopts heating fin heating and electric furnace wire directly Heating two kinds of structures; temperature and humidity test method using wet and dry ball test method, also has a direct measurement method of humidity sensor; control and display control interface using separate temperature and humidity and temperature and humidity combination controller and other methods.
Third, the type of high and low temperature test chamber temperature controller:
The smart temperature controller is controlled by the MCU and can input various thermocouples, thermal resistances or linear signals. With PV, SV value transmission function. Five kinds of output methods only need to plug in the corresponding module, positive and negative control arbitrary settings; high performance, good quality, low price, provides four alarms and methods; manual automatic switching. The master has two types of control modes: PID and PID. The smart temperature controller is rigorously tested before delivery to improve the reliability of the instrument. Common faults of temperature controllers are generally caused by improper operation or parameter settings. The instrument is connected with the host computer through RS-485 multi-master communication mode. Through the cooperation of the communication protocol, it can constitute the DCS operating system. Â
Fourth, correct placement:
1. The thermal conductivity of the mounting of the test sample and the support frame should be low to ensure that the test sample and the mounting and support stand are in a thermally insulated condition.
2. After the temperature test equipment is finished testing, quickly removing the test sample will unnecessarily stress the sample and may produce unexpected results.
3. Pay attention to confirm the temperature condition of the test sample in the test area.
4. Temperature and humidity deviations may occur during upsampling and downdraft tests on large samples. Therefore, careful consideration should be given to the placement of the sample. Every type of test equipment that can simulate the test environment generally has a measurement system, so using off-the-shelf equipment and buying new equipment are all very leisurely.
5. In order to maintain the same temperature in the temperature zone, it is necessary to ensure that the test environment temperature and equipment power supply fluctuations are as small as possible to ensure that the test sample does not generate heat radiation and does not absorb heat so as to ensure stable temperature in the test zone. Simple test equipment can also be manufactured by yourself, but consider the cost, the reliability of the results of the environmental test equipment, the degree of precise control, and the safety factors of continuous operation. Therefore, the sample must be taken out after the test sample has cooled to ambient temperature.
6. Check for volatile substances such as oil and gas in the test area and check for odorless substances. From the point of view of providing environmental test equipment that conforms to the test, a technical specification framework for the test equipment is established. The test equipment supplier can provide specific specifications of the equipment according to this framework.
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