In the testing process, the filter efficiency of each sample shall always meet the requirements of Table 2. If multiple filter materials are used, they shall be indicated; 3 Assembly method of replaceable facepiece; 4 Inspection method before use; 5 How to wear and how to do air tightness check; 6 Advice on when to replace the filter element; 7 If applicable, maintenance methods e.
Sales packaging shall protect the product from mechanical damage and contamination before use. Remove the sample from the original packaging and process it in the following order: 6. The device consists of a steel box, a steel platform, a cam, a drive, a control system on which the sample is placed; the steel box is fixed on a support that can be moved vertically. Through the rotation of the cam, the steel box is lifted by 20 mm. Then let it fall on a steel platform by its own weight, to generate a vibration.
The mass of the steel box shall be greater than 10 kg. The mass of the steel platform shall be at least 10 times the mass of the steel box. The non-encapsulated filter element shall be the smallest sales package.
PLACE the sample laterally in the steel box. The placement method shall ensure that the samples will not contact each other during the test. It allows for 6 mm horizontal movement spacing and free vertical movement distance. The count median diameter CMD is 0. The geometric standard deviation of the particle size distribution is not greater than 1. If it is a multiple filter element, the flow rate shall be divided equally; for example, for a dual filter element design, the testing flow rate of each filter element shall be If multiple filter elements are likely to be used alone, they shall be tested according to the testing conditions of a single filter element.
USE appropriate fixture to connect the disposable facepiece if there is an exhalation valve, the exhalation valve shall be sealed or the filter element to the testing device in an air-tight manner. After the testing starts, record the initial filter efficiency.
Filter efficiency results shall be continuously recorded. If the samples under test have different numbers, there shall be at least two samples for each number. If the samples under test have different numbers, there shall be two samples for each number; wherein 1 of them is an untreated sample and the other is the sample as pretreated in 6. It shall be so designed that the simulant is to be uniformly fed in from the top of the chamber and discharged from the exhaust port at the lower part of the chamber.
SELECT 10 beard-shaving subjects whose face shapes shall be representative of the users of this type of product, considering the differences in face shape and gender; but shall not include those with significantly abnormal face shapes. If the samples under test have different numbers, the most appropriate number shall be selected for the subject as required. The subject shall also understand the testing requirements and methods. The mounting position of the sampling tube shall be as close to the right front side of the user's mouth and nose as possible.
For disposable facepieces, it shall take necessary measures to prevent the sampling tube from affecting the position of the facepiece during the testing. When applicable, connect KP grade filter elements.
CHECK the testing system to confirm that it is in normal working condition. LEAD the particle into the testing chamber to make the concentration reach the requirements. The subject, in the clean air area, wears the sample under test; checks the airtightness according to the usage method; then connects the sampling tube to the particle detector.
MAKE 5 measurements. TAKE the arithmetic mean as the background concentration. Have the subject enter the testing chamber and connect the sampling tube to the particle detector while avoiding particle contamination. Then the subject, according to time requirements, completes the following actions in order: 1 Head still and not talking for 2 min; 2 TURN the head to the left and right about 15 times to see the left and right walls of the testing chamber for 2 min; 5 Head still and not talking for 2 min.
During each action, it shall test the particle concentration in the testing chamber and the facepiece at the same time. Generally, it only tests the last s time interval of this action; avoids testing the cross section of the actions. For each action, it shall test 5 data. Calculate the arithmetic mean as the result of the action. During the testing, subjects are allowed to adjust the facepiece they are wearing; but the testing of the action must be redone.
When using NaCl particle for testing, the total inward leakage and inward leakage are calculated according to formula 1 : Where: C - The particle concentration in the facepiece under test during each action; Ca - The background concentration of particle in the facepiece under test; C0 - The particle concentration in the testing chamber during each action.
When using oily particle for testing, the total inward leakage and inward leakage are calculated according to formula 2 : 6. The main dimensions shall refer to the requirements of Appendix B. It is divided into 3 size types: large, medium, small. SET the system resistance of the testing device to 0. PUT the sample under test on a matching test head mold; adjust the wearing position of the facepiece and the tightness of the head harness, to ensure that the facepiece and the test head mold are in close contact.
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