Many users know how to operate the constant temperature and humidity chamber. First is the pretreatment of the constant temperature and humidity chamber. There is no explicit requirement in the pretreatment standard, but the samples should be kept at normal temperature and humidity before testing.
1. Set the initial stage of the temperature and humidity cycle of the constant temperature and humidity chamber
Adjust the ambient temperature and humidity in the constant temperature and humidity chamber to 30% and 95% respectively.
2. Set the heating stage of the temperature and humidity cycle of the constant temperature and humidity chamber
In the heating stage, the temperature is generally raised to the highest temperature within 3 hours, the humidity is not lower than 90% RH in the last 15 minutes, and the rest time is not lower than 95%.
3. The temperature and humidity of the constant temperature and humidity chamber
In the high-temperature and high-humidity holding stage, keep it for 9 hours, the humidity in the first 15 minutes and the last 15 minutes is not less than 90%, and the relative humidity at other times is 93%±3%.
4. The cooling stage of the constant temperature and humidity chamber
It is required to drop to 25°C within 3 to 6 hours.
Method 1: The cooling rate of the first 1.5h is strictly required, the humidity shall not be lower than 90% in the first 15 minutes of the cooling process, and the humidity shall not be lower than 95% at other times;
Method 2: It has good repeatability for other samples, but there is no relevant requirement under 85% relative humidity, only the humidity cannot be lower than 80% during the cooling process.
5. Low temperature and high humidity of constant temperature and humidity chamber
Low temperature and high humidity maintenance stage: within 24 hours to the end of a cycle, the humidity is not lower than 95%.
6. Intermediate detection of constant temperature and humidity chamber
Measurements that require sample removal prior to recovery are not recommended.
7. The recovery stage of the constant temperature and humidity chamber
Humidity now comes down to room temperature in 1 hour, and finally 1-2 hours in this recovery condition.
Unless otherwise specified, the number of cycles in a 24-hour period is typically 10. If it is not 10 times, the relevant regulations should specify the number of cycles.
Tips: Unless otherwise specified, before the first cycle of the constant temperature and humidity chamber, the test sample should be unpacked, unpowered and ready to use, and placed under the "standard drying conditions" specified in IEC60068-1 for 24 hours ( The temperature is 55±2℃, and the relative humidity does not exceed 20%). Before the initial test, the specimen shall reach a stable temperature under standard atmospheric conditions or the conditions specified in the relevant specification.
Guangdong Yuanyao Test Equipment Co., Ltd. is an ISO9001:2015 certified manufacturer and trader specializing in the research and development and production of environmental test chambers and other environmental test equipment. In 2004, we started producing climate chambers. In 2009, Yuanyao was officially registered. We expanded overseas business in 2011 and won the title of high-tech enterprise in 2017.
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