GB/T 10586-2006Specification for damp heat testing chambers (English PDF)

3.1 Test chamber

An enclosed box or space, thereof, some parts meet the specified test conditions.

3.2 Temperature setpoint

The desired temperature that is set by the test chamber control device.

3.3 Achieved temperature

After stabilization, the temperature at any point in the working space of the test

chamber.

3.7 Temperature gradient

After stabilization, in any time interval, the maximum value of the difference between

the average temperature of any two points in the working space.

3.8 Temperature rate of change

The rate of transition between two given temperatures measured in the centre of the

working space, in °C/min.

3.9 Temperature variation in space

After stabilization, in any time interval, the difference between the average temperature

of the centre of the working space and the average temperature of other points in the

working space.

4.1 Environmental conditions

4.2 Power supply conditions

4.3 Water supply conditions

4.4 Test load conditions

The test load shall meet the following conditions at the same time.

5.1 Product performance

The test chamber is divided into two types. Class-l and Class-II according to its

performance. See Table 1 for its performance indicators.

5.2 Product structure and appearance requirements

5.2.1 The inner wall of the working chamber shall be made of corrosion-resistant

materials; and the surface shall be easy to clean.

5.2.8 Appearance coating layer shall be flat and smooth, with uniform colour, and there

shall be no traces of exposed bottom, blistering, layering or scratching.

5.3 Safety and environmental protection requirements

5.3.1 The insulation resistance value between the terminal and the metal shell of the

chamber shall satisfy. more than 2Mohm in cold state, more than 1Mohm (measured by

500V megohmmeter with accuracy of Grade-1.0) in hot state; and can withstand the

voltage-withstand test with 50Hz AC voltage 1500V and the voltage time of 5s.

5.3.2 The protective grounding terminal shall have a good electrical connection with

the shell of test chamber; and be able to be easily and firmly wired; and shall meet the

requirements of 7.1.9 of GB/T 14048.1-2000.

5.3.3 There shall be protection and alarm devices for over temperature, over current,

water shortage, etc.

6.1 Main test instruments and devices

6.1.1 Anemometer

The induction volume of the anemometer shall be no less than 0.05 m/s.

6.3 Location and number of test points

6.3.1 Three horizontal test surfaces, called upper, middle and lower layers, are set in

the working room of the test chamber. The distance between the upper layer and the

top surface of the working room is 1/10 of the height of the working room; the middle

layer passes through the geometric centre of the working room; and the lower layer is

10mm above the sample rack of the lowest layer.

6.3.3 The relationship between the number of test points and the volume of the working

chamber is.

6.4.2.2 Measure the wind speed at the relative humidity test points (see 6.5).

6.4.2.3 Make the temperature of the working space reach 25°C ± 3°C; and keep the

relative humidity between 45% and 75%.

6.4.2.4 Within 1h, make the relative humidity of the working space no less than 95%.

6.4.2.5 Make the temperature and humidity of the working space continuously change,

according to the procedure given in Figure 2 of GB/T 2423.4-1993, in four stages of

"temperature rise - high temperature and high humidity – temperature fall - low

temperature and high humidity"; and the test is carried out according to the following

requirements.

6.4.3 Data processing and test results

6.4.3.1 Correct the measured temperature and humidity data according to the

correction value of the test instrument.

6.9 Inspection and evaluation method of condensation and water drop in the

working space

6.10 Appearance quality inspection and evaluation method

6.10.1 This inspection shall be carried out once before and after the test of 6.4,

respectively.

6.10.2 Visually inspect the quality of the coating on the appearance of the test chamber,

and the result shall meet the requirements of 5.2.8.

7.1 The inspection of the test chamber is divided into two categories. type inspection

and exit-factory inspection.

7.2 Type inspection

7.2.1 Type inspection shall be carried out in one of the following situations.

7.2.2 Type inspection items and test methods

The type inspection items and test methods are shown in Table 2.

Table 2 -- Inspection Items and Test Methods

7.2.3 Sampling and judgment rules

7.3 Exit-factory inspection

7.3.1 The exit-factory inspection is responsible by the quality inspection department of

the manufacturer.

7.3.2 This inspection is carried out under no-load conditions.

7.3.3 Inspection items and test methods

7.3.3.1 The inspection items and test methods are shown in Table 2.

7.3.3.2 Except for sampling inspection for temperature gradient and temperature

tolerance, other items shall be inspected one by one; and all inspection items shall be

qualified.

7.3.4 Sampling and evaluation rules

Temperature gradient, temperature fluctuation,

7.3.4.1 The exit-factory sampling quantity of temperature gradient and temperature

tolerance is calculated based on 10% of the product batch size, but no less than 2 sets.

8.1 Marking

8.1.1 The nameplate and handwriting of the test chamber shall be clear and durable,

and fastened firmly.

8.1.2 The contents of the nameplate shall include.

8.2 Packaging

8.2.1 The text and marking of the packing box shall comply with the provisions of GB/T

191-2000.

8.2.2 The packing box shall be firm and reliable.

8.2.3 The packing box shall be protected from rain and moisture accumulation.

8.3 Storage

8.3.1 The transport packages of the test chamber shall be stored in a well-ventilated

warehouse without corrosive gases and chemicals.

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