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What is the difference for Medical face mask Air different pressure tester standard from EN14683:2004 to EN14683:2019

 All we know the medical face mask has to test the Breathability(differential pressure), which is the delta P value. The standard of EN14683 required this device which measures the differential pressure to draw air through a measured surface area at a constant air flow rate is used to measure the air exchange pressure of the medical face mask material. A water-filled(or digital) differential manometer is used to measure the differential pressure. A mass flow meter is used for measurement of the airflow.

However, the standard of EN14683:2004 has been replaced by EN14683:2019 version, for air flow leakage issue, the standard propose higher requests for assuring testing result accuracy. Let us see which requests has been highlighted by EN14683:2019:

1. The internal diameter of the top holder and the bottom holder in the contact area with the filter material shall be (25+/-1)mm.

2. The seal of the top and bottom holder onto the filter material shall consist of a metal-metal contact. A metallic ring of internal diameter of (25+/-1)mm and ca.3mm thick will be fixed to the top holder. The bottom holder will consist of a completely flat metallic surface with an internal diameter of (25+/-1)mm and a 3mm area around the open diameter. Materials such as rubber or poly foam do not provide a sufficient seal and may deform into the test area.

3. Validation of the test apparatus shall consist of a leak test. A second flow meter placed immediately before the valve will allow for evaluation of an air leak within the test apparatus. With the sample holder closed, start the pump and adjust the flow meter to read 8l/min on the first flow meter. If no leaks are present both flow meters should read 8l/min.

Another check shall consist of stopping inlet air when both flow meters give 8l/min. After a few seconds both flow meters should indicate 0l/min if no leaks.

QINSUN G285 is totally complied with above new requirements, for more information, please check the product catalog here.



QINSUN G285 air difference pressure

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