9. The airflow should be checked as follows.
I. Remove the breathing tube from the air filter unit.
II. Insert the airflow indicator tube into the air filter unit outlet.
III. Hold the AFU so that the tube is vertical and at eye level.
IV. Verify the ball has risen above the black line on the tube (fig. 13).
V. Remove the airflow indicator tube and refit the breathing tube.
10. To check warnings block the breathing tube outlet by putting a hand into the
suit headspace and covering the open end of the tube with a flat hand (fig. 14).
Ensure that after a short time the buzzer begins to beep and the red light
begins to flash.
11. Remove hand from the outlet. The red light will go out, all three lights will
cycle for a short time then the green light will remain illuminated (fig. 15).
12. The suit is now ready for use.
If required after preparation for use, the AFU may be turned off until the user is ready
to don the suit. When the AFU is restarted the lights will cycle for a short time, then
the green light will remain illuminated. The 60 minute timer will re-set.
9
Fig.13
Fig.14
Red light
Fig.15
Green light
