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We are a professional manufacturer of Electric heating drying oven for more than twenty years and have found that many users have many misunderstandings about the measurement of temperature when using thermostatic ovens, and the following is a specific description of the temperature fluctuation and uniformity test.

According to the test method announced by the national standard GB/T30435-2013 for electric heating (blast) drying ovens.

1. The test method of temperature fluctuation is to test the temperature of the geometric centre point of the working area when the working temperature of the drying oven reaches the set temperature for 2 hours, measure the temperature once every 1 minute and measure 30 temperature values in 30 minutes, take half of the difference between the maximum value and the minimum value of the temperature of the test point, crowned with "±" sign, as the temperature of the test point Fluctuation.

2. The test method of temperature uniformity is when the working temperature of the drying oven reaches the set temperature for 2 hours, the temperature of each test point is measured once every 1 minute in turn, 30 temperature values are measured at each point within 30 minutes, the average value of all the test temperature values is taken as the reference value, the maximum absolute value of the difference between the average value of the temperature of each test point and the reference value is calculated, and it is crowned with "±" sign as the temperature fluctuation of the drying oven. " sign as the temperature uniformity of the drying oven.

From the national standard, it can be seen that the temperature fluctuation and uniformity data are basically tested after the temperature reaches the set value for two hours, which is equivalent to a process of temperature constancy, rather than reaching the set temperature and testing.

According to the test method announced by the national standard GB/T30435-2013 for electric heating (blast) drying ovens.

1. The test method of temperature fluctuation is to test the temperature of the geometric centre point of the working area when the working temperature of the drying oven reaches the set temperature for 2 hours, measure the temperature once every 1 minute and measure 30 temperature values in 30 minutes, take half of the difference between the maximum value and the minimum value of the temperature of the test point, crowned with "±" sign, as the temperature of the test point Fluctuation.

2. The test method of temperature uniformity is when the working temperature of the drying oven reaches the set temperature for 2 hours, the temperature of each test point is measured once every 1 minute in turn, 30 temperature values are measured at each point within 30 minutes, the average value of all the test temperature values is taken as the reference value, the maximum absolute value of the difference between the average value of the temperature of each test point and the reference value is calculated, and it is crowned with "±" sign as the temperature fluctuation of the drying oven. " sign as the temperature uniformity of the drying oven.

From the national standard, it can be seen that the temperature fluctuation and uniformity data are basically tested after the temperature reaches the set value for two hours, which is equivalent to a process of temperature constancy, rather than reaching the set temperature and testing.

In the previous：Technical note on balanced cooling
The next article：Test methods for temperature values related to Electric heating drying oven(II)

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