As we all know, the constant temperature and humidity chamber is an environmental test chamber for testing the performance of products and parts under temperature and humidity conditions. In normal use, the equipment generally does not have any major problems, but in the long-term use of the environmental test chamber, the aging damage of some small parts is inevitable. Once the parts are aging and damaged, the temperature and humidity will be abnormal. The problem is more humidity. The breakdown of the humidity has three performances:
1. The humidity does not go up;
2. The humidity value is very high and cannot be lowered;
3. Humidity has a wide range of fluctuations, and it is impossible to reach the set value and operate stably.
This paper analyzes and solves the problem of failure in the humidity of constant temperature and humidity chamber.
Humidity does not mean that the humidity is lower than the set value, and the main faults are divided into the following types:
1. The humidifier is not heated, the water cannot be heated, and naturally it cannot be humidified; there are several possible failures in the humidifier without heating:
A, the humidifier has no input power: check whether the power supply line is connected well, find out the power failure problem, connect the line;
B. The heating tube in the humidifier burns out: use a multimeter to measure the resistance of the heating tube. If the resistance is too large, the heating tube can be judged to be damaged, and a new heating tube needs to be replaced.
C. There is no water in the humidifier or the water level is low: Before the humidifier heats the water, the water supply system first needs to replenish the humidifier. If the equipment lacks water alarm or the pipeline is blocked, the water level in the humidifier is not enough, which will also cause Humidification, so it is necessary to clean the pipeline or replenish the water tank;
2. The humidity sensor is faulty, and the humidity value cannot be accurately detected, resulting in no humidity: the humidity sensor fault is divided into the following cases:
A. The humidity sensor is broken. Hold the sensor with your hand and see if the temperature on the meter changes. If the displayed value does not move or jumps, you can determine that the sensor is broken and you need to replace the new humidity sensor.
B. Humidity sensor With long-term use, the humidity value caused by excessive error is not accurate: remove the gauze from the humidity sensor, put the temperature sensor and the humidity sensor into a glass of water at the same time, and check the values ​​of the two on the thermostat. Generally, the difference between the two values ​​is within 0.5 degrees. If the difference is too large, the humidity sensor is corrected to ensure that the values ​​of the two sensors are the same or close to each other;
C, the humidity sensor is not installed properly, causing the humidity to be accurately detected;
The conventional humidity detection adopts the dry and wet ball method. It is necessary to measure the gauze on the sensor. When the length of the sensor into the test chamber is too short, the humidity detection may be inaccurate, and the initial position of the sensor installation position adjustment is required.
If an abnormality is found, the user should contact the after-sales department of the manufacturer for assistance in the first time. Do not handle it yourself, and the equipment failure will be aggravated. For high-precision constant temperature and humidity chambers , the operators should also carry out regular maintenance, the condenser of the refrigeration system should be cleaned regularly, the moving parts should be lubricated according to the instructions, the electrical control system should be regularly maintained and checked, etc. These operations are essential. of.
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