Maintaining a constant temperature and humidity chamber requires careful attention to various situations that may arise. These high-precision testing devices are large in size, making them difficult to move or relocate, and their internal circuits can be quite complex. As a result, when a fault occurs, it can be challenging for users to troubleshoot on their own. To help users quickly identify and resolve issues, Shanghai Huanqi Test Equipment Factory has compiled six key troubleshooting solutions for common faults in constant temperature and humidity test chambers.
1. **Abnormal Humidity Display on the Controller**
When the humidity reading appears abnormal, follow these steps to check:
- First, check the over-temperature protector located in the control room. Ensure it is set at 150°C.
- Inspect the machine room for any blockages in the piping, which may restrict water flow.
- Verify that there is water in the water tank. If not, check if the tank itself contains water.
- Examine the solid-state relay responsible for humidity control. If the heater is not functioning, use a multimeter to measure the AC voltage (set to 600V). Touch the red and black probes to the terminals of the solid-state relay marked “H.†Set the humidity controller to 0% and observe if the indicator light turns off. If the measured voltage remains below 10V, the relay is likely burned out or short-circuited. Alternatively, set the humidity to 0% and check if the water in the humidification tank is boiling.
**Solutions:**
- If the over-temperature protector is not set correctly, adjust it to 150°C.
- Turn off the main power, open the drain valve under the humidification tank, and drain the water. Remove the humidification bucket, clean any scale buildup, and wash the silicone tube. Reassemble in reverse order, close the drain valve, and restore power.
- If the water tank is empty, refill it. If no water is present in the tank, the water pump may be faulty—contact Shanghai Huanqi’s customer service for assistance.
- Replace the faulty solid-state relay (marked with “Hâ€) or contact professional technicians for further support.
By following these steps, users can address many common issues without professional help. However, for more complex problems, it is always recommended to consult an experienced technician to ensure safe and effective maintenance. Regular cleaning and inspection can also prevent many of these issues from occurring in the first place.
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