Moisture resistant microbial penetration tester

An overview,

This device is designed and manufactured according to the standard GA124 and GB2890, which is used to test the dead chamber of the positive pressure fire air respirator. The test principle is to measure the CO2 content in the inhaled gas.

Ii. Applicable standards

Ga124-2013 Article "Determination of CARBON dioxide content in Inhaled gas" of Positive Pressure Fire Air Respirator

Gb2890-2009 respiratory Protection Self-priming Filter Gas Mask clause "6.7 Dead chamber Test of mask

Equipment for fire escape in buildings - Part 7: Filter type fire rescue breathing apparatus

Iii. Technical indicators

1. Working environment: The concentration of CO2 gas in the surrounding air is ≤ 0.1%

2. Carbon dioxide gas source: Volume fraction of CO2 gas (5±0.1) %

3. CO2 flowmeter: Flow range: 0-50L/min, accuracy: level 2.5.

4. Equipped with CO2 analyzer: range 0 ~ 12%, accuracy level 1;

The CO2 sensor was selected from The British brand Of Sifu Mei.

5. Equipped with CO2 analyzer: range 0 ~ 5%, accuracy level 1;

The CO2 sensor was selected from The British brand Of Sifu Mei.

6. When equipped with a hand-held anemometer, measuring range: 0 ~ 10m /s, accuracy: ± (0.1m/s+5% of the measured value) and measuring range (0 ~ 2m/s), the anemometer shall be of The German Brand Demap.

7. Equipped with floor electric fans.

8. The adjustment range of artificial lung respiratory frequency was (10 ~ 40) times /min, and the adjustment range of respiratory tidal volume was (0.5 ~ 3.0) L.

9. The instrument is operated by computer. It adopts Detection control program and ZWH4500 acquisition and control card to realize program control, data acquisition, calculation of test results and printing reports, data storage and historical data query, etc.

10. Total power supply: AC220V, power 500W.

Four, structure principle

The main components of the test equipment include: test head mold, mechanical artificial lung with solenoid valve, connecting pipe, flow meter, CO2 gas analyzer and control system.

The test device is a low-speed motor of the test device that drives the artificial lung to reciprocate through the control system to simulate the actual breathing process of human beings.

The push is equivalent to the inhale and the return is equivalent to the exhale.

For the head mold on the upper part of the cabinet, the two processes complete a breathing process.

At the same time, a certain amount of high concentration CO2 was sent into the air, and the whole process of respiration was detected by CO2 gas analyzer.

5. Equipment features

1. The test device is composed of test head mold, mechanical artificial lung with solenoid valve, connecting pipe, flow meter, CO2 gas analyzer and control system.

2. Reciprocating piston motion structure driven by artificial lung servo motor, high regulating accuracy of respiratory frequency and respiratory tidal volume.

3. Automatic computer control, automatic generation of test report.

Print the report.

4. The instrument is operated by computer. It adopts Detection control program and ZWH4500 acquisition and control card to realize program control, data acquisition, calculation of test results and printing reports, data storage and historical data query, etc.

The procedure is executed in accordance with the standard with good repeatability.