Alternating damp heat test chamber working cycle

Alternating damp heat test process:

The alternating heat and humidity test chamber takes 24h as a test cycle, and each cycle is divided into four successive stages: temperature rise, high temperature and high humidity, temperature drop and low temperature and high humidity. The temperature and humidity requirements and control procedures for each stage are as follows:

1. Warming stage:

Within ( 1.5~2.5 ) h , the temperature inside the box should be continuously increased from ( 25 ± 2 ) °C to ( 60 ± 2 ) °C; the relative humidity can be no less than 90% except for the last 15 minutes , and the rest time is not less than 95. % , condensation should appear on the surface of the sample at this stage.

2. High temperature and high humidity stage:

The temperature inside the box should be kept at ( 60 ± 2 ) °C; the relative humidity can be 90%~100% except for the initial or last 15min , and the rest time is ( 93 ± 3 ) % , from the beginning of the cycle until ( 12 ± 0.5 ) h , the total time of the two phases 1 and 2 is ( 12 ± 0.5 ) h .

3. Cooling stage:

Within ( 1.5~2.5 ) h , the temperature inside the box should be continuously reduced from ( 60 ± 2 ) °C to ( 25 ± 2 ) °C; the relative humidity should be no less than 90% except for the initial 15min , and the rest time should be no lower than 95% .

4, low temperature and high humidity stage:

The temperature inside the tank should be maintained at ( 25 ± 2 ) °C and then counted up when it begins to rise.

Baochaotong high and low temperature alternating test chamber and constant temperature and humidity chamber are designed and manufactured according to user requirements, and are practically considered for customers to achieve the most efficient test results.