The over-temperature protection device is one of the necessary protections to ensure the safe operation of the constant temperature and humidity test chamber. When the temperature measured during the operation of the constant temperature and humidity test chamber exceeds the setting, the over temperature indicator flashes and the sound and light alarms. . In order to prevent the abnormal temperature rise of the test chamber, resulting in a combustion explosion, equipment damage, seriously affecting production and endangering the life safety of a series of major accidents. How to judge whether the test box is over temperature protection caused by normal conditions? The inspection method is as follows:
1. Check whether the AU1 indicator of the over-temperature protector is on. If it is on, it indicates that the temperature in the box exceeds the alarm value. If the over-temperature alarm value is set unreasonably, adjust it down or up;
2. Check whether the solid state relay is damaged;
3. Check whether the temperature sensor is damaged;
4. Check whether the fan rotates; put the machine in operation, open the box door, and observe whether the fan is running; if the wind wheel is not visible, and it may be caused by the motor stuck and other reasons, the machine does not rotate, and the temperature in the box is overtemperature;
5. Use a universal meter to measure the resistance at both ends of the motor cable and check whether it is normal;
6. Check whether the instrument is damaged;
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