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The reasons of salt spray test chamber cannot be heated

There are two locations in the salt spray test chamber that need to be heated, and there are clear provisions in various standards. Studio temperature must be 35 °C for the neutral salt spray test and 47 °C for air saturator. In the acid salt spray corrosion test, studio temperature must reach 50 °C, and the air saturator temperature should reach 63 °C.
These are mainly because the high pressure air needs to absorb due to pressure and volume changes during expansion. A large amount of heat, if the high-pressure saturated air is preheated to a certain temperature in advance, the temperature inside the box will be directly pulled down, resulting in inaccurate test results.
1. Check the temperature sensor for damage. You can use the universal meter to measure the resistance by removing the three wires A+, B+, and B- of the sensor. When a good sensor is being measured, two of them should be on, and the other should be 110Ω, and the other one should be 110Ω. Otherwise, the sensor is damaged and replaced.
2. Check if the solid state relay is damaged. If it is not energized, use the multimeter side to enter or exit the section. If it is conductive, it means solid state breakdown, otherwise the solid state relay is intact.
In the case of power supply, by observing whether the conduction indicator on the relay is lit, whether there is 220V voltage to the N line, if not, then check the contactor; if there is, then measure whether the output of the solid state relay has 22V voltage to the N line, If it is still not, it means the relay is damaged and needs to be replaced.
3. Check if the heating tube is damaged. Use a multimeter to measure the resistance at both ends. If there is a certain resistance, if it is good, otherwise it proves that it has entered the damage, you need to replace the heating tube.
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