The operating conditions defined in the high and low temperature test chamber standard

We all know that the manufacturer will say the conditions of use when buying any items. For example, the seller who buys a down jacket will say that this cannot be hand-washed and should be placed in a dry place. When buying appliances, this thing is not water-filled. It depends on whether the voltage is stable. Are there any dangers such as peeling and leakage of wires? Similarly, when we purchase test instruments, we use them as a kind of scientific experimental testing instruments. In the high and low temperature test chamber standards, we clearly stipulate the use conditions of the test chamber:
The first is the environmental conditions for placement:
Temperature: 15 ℃ ~ 35 ℃;
Relative humidity: not more than 85%;
Atmospheric pressure: 80kPa ~ 106kPa;
No strong vibration around;
No direct sunlight or direct radiation from other heat sources;
No strong airflow around: when the surrounding air needs to be forced to flow, the airflow should not be directly blown onto the box;
There is no strong electromagnetic field around;
There is no high concentration of dust and corrosive substances around.

Second is the power supply / water supply conditions:
Power supply conditions:
Voltage: 220V ± 22V or 380V ± 38V;
Frequency: 50Hz ± 0.5Hz.
Water supply conditions:
Tap water or circulating water that meets the following conditions can be used:
Water temperature: not higher than 30 ℃;
Water pressure: 0.1MPa ~ 0.3MPa;
Water quality: meets industrial water standards.

Finally, the load conditions (load refers to load bearing and placement space):
The load of the test chamber should also meet the following conditions:
The total mass of the load shall not exceed 80kg per cubic meter of working empty volume;
The total volume of the load is not greater than 1/5 of the volume of the working room;
On any cross-section perpendicular to the prevailing wind direction, the sum of the load areas should not be greater than 1/3 of the cross-sectional area of ​​the working room at that location, and the flow of airflow should not be blocked when the load is placed.

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