Dead space detector

I. Overview

This device is based on standardsGA124 and GB2890 are designed and manufactured for testing dead chamber testing of positive pressure fire air respirators. The testing principle is to determine the CO2 content in the inhaled gas.

2、 Applicable standards

Clause 6.13.3 Determination of Carbon Dioxide Content in Inhaled Gas of GA124-2013 Positive Pressure Fire Air Breathing Apparatus

GB2890-2009 "Respiratory Protection Self priming Filter Gas Mask" clause "6.7 Mask Dead Chamber Test"

GB 21976.7-2012 Building Fire Evacuation and Refuge Equipment Part 7: Filter type Fire Self rescue Breathing Apparatus

3、 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 is selected from the British brand Shifumei.

5. Equipped with CO2 analyzer: range 0-5%, accuracy level 1; The CO2 sensor is selected from the British brand Shifumei.

6. Equipped with handheld anemometer, range: 0-10 m/s, accuracy:± (0.1m/s+5% measured value)measurement range（0～2m/s）At that time, the anemometer should be selected from the German brand Detu.

7. Equipped with a floor standing electric fan.

8. The range of artificial lung respiratory rate regulation is (10-40) times/min, and the range of respiratory tidal volume regulation is (0.5-3.0) L.

9. The instrument is operated by a computer and uses the Detection control program and ZWH4500 acquisition control card to achieve functions such as program control, data acquisition, calculation and printing of test results, data storage, and historical data query.

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

4、 Structural principle

The main components of the experimental device include: test head mold, mechanical artificial lung with solenoid valve, connecting tube, flow meterComposition of CO2 gas analyzer and control system.

The experimental device is driven by a low-speed motor of the detection device through a control system to drive the artificial lung to make reciprocating motion, simulating the actual breathing process of humans. Pushing is equivalent to inhaling, and returning is equivalent to exhaling. For the head mold on the upper part of the cabinet, these two processes complete a breathing process. Inject a certain amount of high concentration while inhalingCO2， And use a CO2 gas analyzer to detect the entire breathing process.

5、 Equipment features

1. The experimental device consists of a test head mold, a mechanical artificial lung with an electromagnetic valve, a connecting tube, a flow meter, a CO2 gas analyzer, and a control system.

2. The piston reciprocating structure driven by the servo motor of the artificial lung has high precision in regulating respiratory rate and tidal volume.

3. The computer is fully automated and generates test reports automatically. Print the report.

4. The instrument is operated by a computer and uses the Detection control program and ZWH4500 acquisition control card to achieve functions such as program control, data acquisition, calculation and printing of test results, data storage, and historical data query. The program is executed completely according to the standard, with good repeatability.