Protective Clothing Particle Filtration Efficiency Tester DR258A

Protective Clothing Particle Filtration Efficiency Tester DR258A

[Scope of application] :
This Solid Particulate Protective Performance Testing System is used to test the overall protective performance of solid particulate chemical protective clothing, which exists in the workplace environment.
The leakage rate of particulate chemical pollution into clothing was used to characterize the performance index of protective clothing.

Used for leakage testing in section 6.4 of GB 2626-2019
Technical requirements for medical protective masks
(GB 19083-2010) Appendix B Tightness

Solid Particulate Protective Performance Testing System
[Original theory] :

Through aerosol generator to generate standard NaC1 aerosol particles, pass into the testing room to maintain a relatively stable state, the wearing protective clothing under test in the test object indoor test action, according to predetermined plan by particle detector measured at fixed sampling points were protective clothing internal NaC1 particle aerosol concentration, by the following indicators, To evaluate the overall protective performance of protective clothing against particulate matter:
— Single inward leakage rate at each sampling location;

The total inward leakage rate of each
— protective suit under test Ls;
— tested object LH;
— test action LE;
— sampling location LP;
— Average total inward leakage rate L.

Solid Particulate Protective Performance Testing System
[Relevant standards] :

GB/T 29511-2013 Protective clothing Solid particulate chemical protective clothing item 4.3.1 and Appendix A
Respiratory protectors — Self-priming filter respirators — Section 6.4
Technical requirements for medical protective masks — Appendix B: Tightness
ISO 13982, BS EN ISO 13982 EN 1073-1-216, etc

2. EN 1073-1-2016 Standard sampling procedure: information at request

3. GB/T 29511-2013, GB2626-2019 and EN 1073-1-2016 differences:

GB/T 29511-2013 GB2626-2019 EN 1073-1-2016
Sampling point in test room Single spot on the head Single spot on the head Three places (top of head, waist, knees)
Test suit sampling point Three independent locations (chest, waist, knees) One place in the breathing zone (Chest, waist, knees) merge into one place

One place in the breathing zone

Sampling method One of the two places when one place is sampled Sample only When the body part is sampled, the back is energized.

Breathing area: sampling during inhalation, and replenishing clean air with time meter on expiration (inhalation and exhalation are determined by pressure detection).

Solid Particulate Protective Performance Testing System

 

[Technical parameters] :

 

  1. Test environment requirements: 1, ambient temperature (20±5)℃, relative humidity ≤60%
  2. (4000 * 5000 * 3000 or higher) mm use of space, into the drainage and ventilation is good

Ii. System Parameters:

  1. Walk-in test chamber: effective internal size: 1800mm×1500mm×2100mm (L×W×H)

Outdoor size: 1950mm×1650mm×2500mm (L×W×H)

Control cabinet size: 700mm×700mm×1600mm (L×W×H)

  1. Environment simulation monitoring system

(1) Na Cl particle aerosol generator:

Particle aerosol concentration (10 ±1) mg/mPPP3
Aerodynamic particle size distribution of particulate matter (0.02~2)μm
Mass median diameter  aBOUTO.6μm
Effective spatial concentration change ≤10%
Occurrence ≥100L/min

Two particle concentration detectors

The dynamic range is (0.001 ~ 200)mg/m3, the accuracy is ±1%, and the response time is ≤500 ms

(3) Horizontal foot drive test bench, running speed (5 kg 0.5)km/h

(4) Air duct circulation and maintenance and cleaning device

Control and analysis system

  1. Centralized console, PC programmatic control and prompt to complete the whole process of the test
  2. Automatic monitoring test data, automatic calculation of experimental single internal leakage rate, total inward leakage rate, average total inward leakage rate and other experimental results, a variety of ways to output experimental results.

 

[Related traceability indicators] :

 

NaC1 particle aerosol generator

The concentration of NaC1 aerosol is (10±1) mg/m³, and the concentration change in the effective space of the test chamber is ≦±10%. The aerodynamic particle size distribution of the particles is (0.02 ~ 2) μm, and the median mass diameter is about 0.6μm

  1. Particle detector

Two detectors were used to detect the dynamic range of NaC1 aerosol concentration in the test chamber and the protective clothing under test, respectively, from 0.001 to 200 mg/m³, the accuracy was ±1%, and the response time of the detectors was ≦500ms

  1. Horizontal foot drive test bench

1 set, running speed (5±0.5) km/h, installed in the test room

  1. Sampling pump and air pipeline

Two sets were used to collect and test NaC1 aerosol particles in the test room and the protective suit under test. Flow range (0.05-4) L/min, flow fluctuation < The + / – 0.2 L/min. It is ensured that the sampling probe can be sampled at a flow rate of (2±0.5) L/min inside the protective suit under test

To ensure that decompression resulting from sampling in the suit under test does not result in additional inward leakage rate, it shall be delivered into the suit under test at a rate of (2±0.5) L/min at the same time of sampling. Clean air can be fed through one of the other two sampling probes in the sampling interval in accordance with the sampling sequence in the schematic diagram

  1. Sampling probe

Four sampling probes, one of which is used to detect the concentration of NaC1 particle aerosol in the test chamber environment, and the other three are used to measure the concentration of NaC1 particle aerosol in the protective clothing under test. The sampling probe is connected to a transparent plastic tube of suitable length with an inner diameter of 4.0mm

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