Analysis of common failures in the Shanghai Qianshi constant temperature and humidity analysis test

Constant temperature and humidity test chamber: It is mainly used for high temperature, low temperature and humidity test, electronic, electrical, LED photoelectric, chemical, plastic and other products reliability testing and improvement of product quality used. However, during operation, if the temperature of the constant temperature and humidity test chamber does not reach the temperature index, the low temperature slowly cools down, and the humidity cannot work as planned, there will be three serious failures. mqWTextile Testing Instruments, Testing Equipment Manufacturer

Error 1. During the operation of the constant temperature and humidity test chamber, the temperature change does not reach the test temperature value. How to fix the problem?mqWTextile Testing Instruments, Testing Equipment Manufacturer

In the high temperature test, when the temperature change does not reach the value. Testing the temperature reading allows you to check the electrical systemand correct errors one by one. When the temperature of the constant temperature and humidity test chamber rises very slowly, the air circulation system needs to be checked to see whether the air circulation control damper is normally open. Otherwise, check that the air circulation motor is running normally. If the temperature overshoot is serious, the PID tuning parameters need to be adjusted. If the temperature rises directly, the over-temperature protection means that the controller is defective and the controller must be replaced. mqWTextile Testing Instruments, Testing Equipment Manufacturer

Error 2. During the moist heat test, the humidity does not meet the specified requirements. What is the problem?mqWTextile Testing Instruments, Testing Equipment Manufacturer

When the constant temperature and humidity test chamber runs the damp heat test, the actual humidity is displayed. When it reaches 100% or the actual humidity is very different from the target humiditydeviates and the value is much lower, the former phenomenon occurs: it can be caused by drying out of the gauze on the wet bulb sensor. Then check if there is a lack of water in the wet bulb sensor sink. The water level is automatically controlled by a water level controller. Check whether the water supply system of the water level controller is normal and whether the water level controller is working normally. Another possibility is that due to long-term use or the purity of the water system, the wet ball gauze will harden the gauze, which may cause the gauze to fail to absorb water and dry. You only need to replace or clean the gauze to eliminate the above phenomena. The latter phenomenon is mainly due to the fact that the humidification system of the constant temperature and humidity test chamber does not work. Check the humidification water supply systemSystems to determine whether there is a certain amount of water in the water supply system and whether the water level is high Controller to control the water level of the humidifying boiler to normal and whether the water level in the humidifying boiler is normal. . If all the above items are normal, check the electrical control system and ask the maintenance personnel to overhaul it. mqWTextile Testing Instruments, Testing Equipment Manufacturer

Error 3. The low temperature of the constant temperature and humidity test chamber can not reach the target, and the cooling is very slow. How to fix the problem?mqWTextile Testing Instruments, Testing Equipment Manufacturer

If the low temperature of the constant temperature and humidity test box can not reach the test target. Then you need to watch the temperature change. Whether the temperature is dropping very slowly or the temperature tends to rise after the temperature reaches a certain level, the first thing to check is whether the studio before the Nlow temperature test has dried and whether the studio is kept dry afterwards. Then place the test sample in the workspace and run the test again. Whether there are too many test samples in the working space, causing the wind to come in. The working space cannot fully circulate. After eliminating the above reasons, it is necessary to check whether there is a fault in the cooling system. This requires the manufacturer's personnel to carry out maintenance work. The latter phenomenon is caused by the poor working environment of the test chamber equipment with constant temperature and humidity. The ambient temperature and the location of the equipment (the distance between the back of the box and the wall) must meet the requirements (there are provisions in the equipment manual). mqWTextile Testing Instruments, Testing Equipment Manufacturer