Drager Multigas Detector

The Drager multigas detector (fig. 6-39) is used to test the atmosphere within a space for toxic gases such as carbon dioxide, carbon monoxide, nitrogen dioxide, and hydrogen sulfide. A separate detector bulb is used for each type of gas. For safety and accuracy, you should use only Drager detector tubes with Drager multigas detectors.

The unit consists of two main components- the bellows pump and the detector tube. It is simple to use. To operate the unit, use the following procedures:

1. Check the bellows pump for leaks before you conduct a test by inserting an unopened detector tube into the pump head and squeezing the bellows pump. If the bellows pump has not expanded completely after 30 minutes, the unit is safe to use.

2. Break off both tips of a detector tube. Use either the break-off eyelet on the unit or the break-off husk. The break-off husk is a separate accessory that is hand-held and comes with the unit.

3. Insert the detector tube tightly into the pump head. Ensure that the arrow on the tube points towards the pump.

4. Hold the bellows pump in your hand with the detector tube pointing upwards.

5. Squeeze the bellows until it is completely depressed. When the bellows is compressed, the air is forced out through the outlet valve instead of the detector tube.

6. Straighten your fingers so they are straight out along the side of the bellows. This creates the suction required to draw air into the detector tube. Allow the limit chain to become taut after each squeeze to complete the suction process.

7. Repeat the suction process as directed by the detector tube operating instructions. Each tube requires a different number of squeezes.

8. Evaluate your test results as described in the detector tube operating instructions.

9. Upon completion of the tests, flush out the bellows pump with fresh air. Do this by squeezing the bellows pump a few times without a detector tube inserted in the unit. This will help to prevent corrosion of the unit by vapors that are given off by various types of detector tubes.

8.504

Figure 6-39.-Drager multigas detector. 6-26

For additional information on atmospheric testing instruments and standard Navy gas-free testing procedures, refer to the Naval Ships' Technical Manual, chapter 074, volume 1.

FIGHTING THE FIRE

This section on fighting the fire covers getting to the fire, fighting the fire, preventing the spread of fire, procedures for followup to prevent reflash, and cleanup after the fire is out.