Temperature control of high and low temperature test chamber and solutions for abnormal conditions
The high and low temperature test chamber is the most common temperature test equipment in the environmental test equipment. Its similar products include high and low temperature alternating test chamber, constant temperature and humidity test chamber, high and low temperature humidity and heat alternating test chamber, etc. We know the general high temperature The temperature of the low temperature test chamber is constant. The principle is to set a suitable temperature before starting operation, so that the high and low temperature test chamber gradually reaches this suitable constant temperature, so the working principle of the high and low temperature test chamber is to maintain the temperature Change the control mode, set a target temperature and humidity point, the test chamber has the ability to automatically thermostat to the target temperature and humidity point. This is more conducive to the smooth operation of the high and low temperature test chamber. Now, we will refer to the high and low temperature test box to learn more about the temperature control of the high and low temperature test box series products.
How does the high and low temperature test chamber achieve high temperature and low temperature
Different from the ultraviolet light weather resistance test box, the high and low temperature test box has the ability to complete the test process according to the preset curve, and can be within the range of the maximum heating and cooling rate capability, and can accurately control the temperature rate, that is, according to The slope of the set curve controls the heating and cooling rate. High temperature control is a heating process. The heating of the high and low temperature test chamber uses an independent heating method, the far infrared nickel-chromium alloy high-speed heating electric wire, and the temperature control adopts P · I · D + S · S · R system co-channel coordinated control. The output power is calculated by the microcomputer to achieve high precision and high efficiency of electricity consumption. In order to achieve a rapid heating rate and high temperature, generally by increasing the number of heating wires and improving the performance of temperature control software. The refrigeration system of the high and low temperature test chamber adopts the unit Freon refrigeration system composed of the French-made Taikang fully enclosed compressor. The design of the refrigeration system uses energy regulation technology, which can not only ensure the normal operation of the refrigeration unit, but also effectively adjust the energy consumption and cooling capacity of the refrigeration system, so that the refrigeration system can be maintained in the optimal operating state.
Solution for abnormal temperature in high and low temperature test chamber
When the temperature and humidity controller of the high and low temperature test chamber shows abnormal temperature: please check whether the over-temperature protector of the control panel is set at the position of 150 ℃. Check whether the circulating motor in the equipment room is damaged or not running. Please check whether the solid-state relay in the temperature part is burned out and short-circuited. If the heater is not burned out, please use the AC voltage range of the three-meter meter. The voltage range is turned to 600 volts. On both sides of a solid state relay, set the temperature setting value of the humidity part to 0 ° C. At this time, the indicator light of the solid state relay of the temperature part will not light up. If the measured voltage value does not change, it is maintained below 10V It means that the solid-state relay is burned and short-circuited. The temperature control instrument of the high and low temperature test chamber uses imported instruments, with PID adjustment, SSR output, fast auto-tuning, digital display, and convenient reading. The box door, working room and shell are equipped with high temperature resistant sealing strips and pressing devices, which can effectively ensure the sealing and thermal insulation performance of the box body. The French "Taikang" original fully enclosed compressor used in the refrigeration system ensures the low temperature stability of the high and low temperature test chamber. The high and low temperature test chamber has over-temperature protection, overload protection of the control circuit, short-circuit protection, safe and reliable use. The studio and sample rack are made of stainless steel, and the outer box is made of high-quality cold-rolled steel plate with beautiful appearance.
The high and low temperature test chamber is widely recognized by the market for its intelligent temperature control characteristics.
The above is a detailed analysis of the temperature control part of the series of high and low temperature test chambers by Guangdong Hongzhan Technology Co., Ltd. For more product performance analysis, please pay attention to our official website (http://oven.cc)
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