Maintaining a constant temperature and humidity chamber is essential to ensure accurate and reliable test results. These high-precision instruments are often large in size, making them difficult to move or reposition, and their internal circuitry can be quite complex. As a result, when a malfunction occurs, users may find it challenging to identify the issue on their own. To help users troubleshoot and resolve common problems efficiently, Shanghai Huanqi Test Equipment Factory has compiled six key solutions for common faults in constant temperature and humidity test chambers.
1. **Abnormal Humidity Display on the Controller**
When the humidity reading appears incorrect or unstable, follow these steps to diagnose the problem:
- Check if the under-water over-temperature protector in the control room is set to 150°C. If not, adjust it accordingly.
- Inspect the machine room for any blockages in the water pipes that may be causing restricted water flow.
- Verify that there is water in the water tank. If the tank is empty, check if the water supply is properly connected.
- Examine the solid-state relay in the humidity control section. If the heater isn't working, use a multimeter to measure the AC voltage at 600V range. Touch the red and black probes to the terminals of the solid-state relay marked with "H." Set the humidity control to 0% and observe if the relay indicator lights up. If no voltage is detected or the relay remains inactive, it may be burnt out or short-circuited. Alternatively, check if the water in the humidification tank is boiling when the setting is at 0%.
**Solutions:**
- If the over-temperature protector is not set to 150°C, adjust it to the correct position.
- Turn off the main power, open the drain valve beneath the humidification tank, and drain any remaining water. Remove the tank, clean any scale buildup, and wash the silicone tube thoroughly. Reinstall everything in reverse order, then close the drain valve and restore power.
- If the water tank is empty, add water immediately. If the tank is full but no water is reaching the system, the water pump may be faulty—contact customer service for assistance.
- Replace the solid-state relay labeled "H" in the humidity section, or contact Shanghai Huanqi’s maintenance team for professional support.
By following these troubleshooting steps, users can quickly identify and address common issues, reducing downtime and ensuring optimal performance of their testing equipment. Regular maintenance and prompt action are crucial to maintaining the accuracy and longevity of constant temperature and humidity chambers.
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