Home > News > Industry news >

Test method of electric Vacuum drying oven

According to the national standard of vacuum drying oven GB/T29251-2012 published.

1. Maximum temperature test - after the vacuum oven reaches the maximum temperature and can be maintained at 30 minutesIt is called its highest temperature value. 

2. Temperature fluctuation test --- choose the highest temperature as the set temperature, and test the temperature of the geometric centre of the inner chamber after 2 hours of reaching it, measure every 1 minute, and measure 30 temperature values in 30 minutes, then take half of the difference between the maximum and minimum values as its temperature fluctuation.

3. Vacuum sealing test --- first connect the vacuum pipe and vacuum pump to the vacuum drying oven to form the whole vacuum sealing state, turn on the vacuum pump, when the vacuum reaches 0.3kPa continue to run for 1 hour after the vacuum pump suction port and the vacuum drying oven outlet connection hose stuck tightly, so that it is in the disconnected state, and at the same time turn off the vacuum pump, in the ambient temperature of 5-35 ℃ within 24 hours the vacuum in the vacuum drying oven should not be greater than 8kPa.

4. Temperature Indication Error Test --- Set the highest temperature as the test temperature, after reaching 2 hours, measure the temperature value of the centre point every 1 minute in turn, 30 temperature values in 30 minutes, calculate the difference between the average value of the centre point and the indication value of the temperature controller as the temperature indication error.

5. Temperature stability test --- Set the highest temperature as the test temperature, test the temperature of the centre point after 2 hours, test every 1 minute, 30 temperature values in 30 minutes, take the average value as the average of the starting temperature, test every 4 hours, 6 times, each time in 5 minutes with equal intervals to record 6 temperature values, calculate the average value of its temperature, and finally take the average value of the 6 The maximum value of the difference between the average of the 6 temperature values and the average of the starting temperature is taken as its temperature stability.

6. Surface temperature test ---- set the highest temperature and maintain a constant temperature for more than 2 hours, using a thermometer to test any surface around 80mm from the door frame, observation window and so on and beyond, the temperature should not be greater than the room temperature +35℃.

7. Temperature rise time test - Heating at the highest power, the time from 35°C to the first time the maximum temperature is reached should not exceed 120 minutes.

8. Electrical safety test --- The cold insulation resistance of the energized part to the vacuum drying oven shell shall not be less than 1 Megohm when tested with an insulation resistance measuring instrument of 500V working voltage and 10 level of accuracy. Using 5kV withstand voltage tester for AC voltage 1500V, frequency 50Hz, duration of 1 minute withstand voltage strength test, there should be no insulation breakdown or flashover phenomenon.

9. Over-temperature protection test ---- Check the electrical schematic diagram of the vacuum drying oven, the temperature control instrument or the accessories with over-temperature protection components and technical documents to confirm that there is this function. Test the temperature setting value below the actual temperature of the inner chamber, if the over-temperature device can be started and can work continuously for 3 times. The surface temperature of the cabinet should meet the previous requirements for surface temperature and the temperature rise inside should not exceed the thermal limits of the environment to which the electrical components and materials are exposed.

10. The continuous operating time test ---- tests the temperature fluctuation of the vacuum drying oven every 24 hours during 72 hours of continuous operation and calculates the average value of the temperature, the fluctuation shall comply with the previous requirements and the difference between the average values of the temperatures of the adjacent 24 hours shall comply with the temperature stability requirements described in the previous section.

In the previous:Testing the temperature values associated with an incubator The next article:Explanation of relevant parameters of electric Vacuum drying oven
  • Pre-sale
  • 0086-020-36246586
  • 0086-020-36246650
  • 0086-020-36246649
  • After-sales
  • 0086-18688422996
  • Complaint
  • service@kentonchina.com