Standard

Respiratory mask leak test equipment is used to detect the filtering efficiency and protective effect of respiratory masks and protective masks. The equipment is made in accordance with GB2626-2019-5.4 leakage standard requirements.

Product Manual

2.1 The environmental test chamber for detection consists of a size of 2000W × 2000D × 2500H m and a volume of 10m3. The cabin is made of stainless steel frame and tempered glass.

2.2 The steady flow network at the top of the test chamber causes the gas to form an irregular swirl, accelerate the gas mixing, so that no dead angles are left in the chamber, and the pollutant uniformity required by the experiment is achieved after several cycles.

2.3 The overall structure of the environmental test chamber is mainly composed of the cabin, air purification system, exhaust air duct, and air sampling system

Technical Parameters

Test chamber volume

10m³

Test cabin dimensions

2000×2000×2500mm (L × W × H), tolerance of ± 0.5m³ is allowed

Material

Tempered glass

Thickness

10mm

Frame material

Stainless steel frame

Sealing material

Use silicone rubber strip and glass sealant

Take (in) sample hole

Made of 304 stainless steel, a total of four, ball valve control, with hose;

Guardrail

Sampling hole surface with guardrail

Illumination

Equipped with 2 LED fluorescent tubes (the lighting lamp and fan are installed on the top of the test chamber, fixed inside and outside with Teflon material, and sealed with imported glass glue that does not release)

Clean system

(Internal purification system)

Primary effect filter, middle effect filter, high efficiency filter

Exhaust system

(External purification system)

Fan: 1000m³ / h

The sewage treatment adopts spray water washing treatment and photocatalytic oxidation method, which can ensure that the air discharged from the sewage outlet can meet the requirements stipulated by the national environmental protection department.

Socket

There are two 10A and 16A sockets each, a total of four, of which two are mains power and two need to collect power

Test mounting bracket

Equipped with a stainless steel split wall hanging machine internal mounting bracket, size: height = 180cm width = 100cm, button width = 50cm (two, can be freely moved on the upper beam)

Cleanliness level

Turn on the high-efficiency air filter to purify the air in the test room, and make the particle background concentration of particles above 0.3 μm less than 1000 particles / L within 20 minutes.

Air tightness

No more than 0.05h^-1

Test parameters

4.1 NaC1 gas volume: more than 100L / min

4.2 NaC1 particle concentration 10 soil 2mg / m³

4.3 The amount of gas generated by NaCl particles is not less than 100L / min. The concentration of particles is 4mg / m3 ~ 12mg / m3. The concentration change in the effective space of the detection chamber should not be higher than 10%. The aerodynamic particle size distribution of the particles should be 0.02μm. ~ 2pum. Mass median diameter is about 0.6um.

4.4 Oil particles should be harmless to the human body, such as corn oil, paraffin oil, etc .; the gas volume should not be less than 100 l / min, and the particle concentration should be 20mg / m3 ~ 30mg / m2. Above 10%; the aerodynamic particle size distribution of the particles should be 0.02μm ~ 2um, and the mass median diameter is about 0.3pm. This method should not be used for TIL detection of disposable masks with KN-type filter elements.

Test Methods

5.1 Prepare the sample to be tested and install the sampling tube.The installation position of the sampling tube should be as close as possible to the user's nose and nose. For disposable masks, necessary measures should be taken to avoid the sampling tube from affecting the position of the mask during the test ; Connect KP100 grade filter elements when applicable.

5.2 Check the inspection system to confirm that it is in normal working condition.

5.3 Introduce the particulate matter into the detection chamber to make the concentration meet the requirements.

5.4 The subject wears the test sample in the clean air area, checks the air tightness according to the usage method, and then connects the sampling tube to the particle detector to determine the background concentration in the mask when the subject is breathing outside the detection chamber. Five data were measured, and the arithmetic mean was taken as the background concentration.

5.5 Allow the subject to enter the testing room, and connect the sampling tube to the particulate detector while avoiding particulate contamination, and then the subject completes the following actions in order according to time requirements:

5.5.1 Head still, not talking for 2min

5.5.2 Rotate the head left and right, and look at the left and right sides of the detection chamber for 15 minutes about 15 times

5.5.3 Looking up and down to check the roof and the ground for about 2 minutes about 15 times

5.5.4 Read Aloud-Paragraph or Speak Aloud for 2min

5.5.5 Head still, not talking 2mi

5.5.6 During each action, the particle concentration in the detection chamber and the mask should be detected at the same time. Generally, only the 100s time zone after the action is measured to avoid the cross section of the action. For each action, it should be detected. 5 data, and calculate the average value as the result of this action.

5.5.7 The subject is allowed to adjust the mask worn during the test, but the test of this action must be redone.