OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com
14
5. Slowly inject 10 mL of 5N sulfuric acid solution into chamber 1 through the
rubber septum using the hypodermic syringe and needle.
Over-fill the syringe by at least 0.5 mL so an exact amount may be injected.
6. Loosen the nylon tube holder and lower the dispersion tube to about ¼"
from the bottom of the chamber.
7. Open the stopcock on the gas bag. Restart the flow of N
2
O by tighten-
ing the regulator T-screw. Allow the gas bag to fill slowly and steadily for
ten minutes. When the bag is firm to the touch, shut off the flow of gas by
unscrewing the regulator T-screw. Close the stopcock to seal off the bag.
8. Immediately break the tip off each end of the Dräger tube. Remove the
rubber hose from the chamber 3 connection and connect the end of the
hose to the upstream end of the Dräger tube. An arrow on the Dräger
tube indicates the gas flow direction. Connect the hand pump to the other
end of the Dräger tube. The arrow on the Dräger tube should point from
the bag toward the hand pump.
9. Open the stopcock on the gas bag. With steady hand pressure, fully de
-
press the hand pump. Release the pump so that gas flows out of the bag
and through the Dräger tube. Operate the pump and count the strokes
required to empty the bag. If it takes more than ten strokes to empty the
bag there is probably a leak in the system and the test will be invalidated.
Gas Bag (#151-06)
Stopcock (#151-07)
Dräger Hand Pump (#151-09)
Dräger Tube (#151-04)
