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In the new version of GB/T3836-2021 explosion-proof standard, explosion-proof protection levels have been added to explosion-proof electrical equipment, which are divided into:

Da "protection level (EPL" Ma "or" Ga ");

Protection level of 'db'（EPL "Mb" or "Gb"）;

DC protection level（EPL"Gc"）.

This standard update has addedExplosion proof typeDa "explosion-proof protection level,Catalytic sensor products that are only applicable to portable combustible gas detectors and meet the following requirements:

1. The maximum internal net volume shall not exceed 5 cubic centimeters;
2The introduction of conductive materials into the sensor should directly use a sealed joint surface that complies with Chapter 6 in the housing wall;

3The respiratory device of the sensor should comply with Chapter 10 and be bonded to the housing wall without gaps (such as bonding or sintering according to 6.1),Or apply supplementary mechanical fixation methods to press fit on the wall of the shell (such as forging);
4Powered by circuits with protection level "ia", the maximum dissipated power is limited to 3.3W (for Class I) and 1.3W (for Class II);
Note: Catalytic components generally operate at high temperatures. IfDissipated powerExceeding the normal working level, component failure causes an open circuit. Therefore, the required power limitation provides a limit on the external surface temperature.

5Modify the non explosion test of 15.3 or 15.4.4 (as applicable) to increase the number of non explosion tests, as shown in Table 1.

For more information on the latest explosion-proof standards, please contact Zhongnuo Testing directly.