BIRD MARK 7 - Page 31

9.8 Recheck for 3.0 seconds (+ .5 sec.)
expiratory time.
9.9 Rotate control knob counterclockwise
against cam stop. Check for an expiratory time
of between .5-1.0 seconds. Rotate control knob
full clockwise “off? when parameters are
NOTE: To increase or decrease the minimum :
expiratory time, reposition the cam stop. A counterciock-
wise movement will decrease the expiratory time.
9.10 Troubleshooting CONTROLLED
satisfied. EXPIRATORY TIME.
PROBLEM POTENTIAL CAUSE CORRECTIVE ACTION
Respirator cycles 1. SENSITIVITY SELECTOR arm 1. Readjust to 20 or recalibrate.
automatically with
CONTROLLED or requires calibration.
EXPIRATORY TIME stem | 5 worn, cut or torn O-ring
full clockwise.
system.
adjusted to minimum sensitivity
(P/N 0114) on end of
EXPIRATORY TIME valve. worn.
3. Leak in the EXPIRATORY TIME 3. Mark 7 — Remove ambient
4, Malfunction in expiratory
termination cartridge.
2. Remove valve to check
condition of O-ring. Replace if
compartment, cycle respirator
“ON" (without test lung) and
place a leak detecting solution
on both ends of tubes 2, 3, and
30. Also place solution around
retaining ring on back side of
expiratory termination cartridge.
Correct any leaks in system.
Mark 7A — Remove ambient
compartment cycle respirator
“ON” (without test lung) and
place a leak detecting solution
on both ends of tubes 27 and
30. Also place solution around
retaining ring on back side of
expiratory termination cartridge.
Correct any leaks in system.
Mark 7A — Remove pressure
compartment to apply leak
detecting solution on both ends
of tube 10 and check valve.
4. Check operation of cartridge.
10.0 PRESSURE RELIEF VALVE
10.1 Remove mainstream stopper from pressure
compartment and reinstall PRESSURE RELIEF
valve.
10.2 Remove test lung and increase PRESSURE
SELECTOR arm full clockwise.
10.3 Cycle respirator “ON” and occlude end of
breathing assembly several times to allow veni-
ing of the relief valve before calibration.
10.4 Manometer needle should register
30cmH,0. Use W” nut driver or open end
wrench to adjust PRESSURE RELIEF valve to
desired venting pressure.
10.5 Troubleshooting PRESSURE RELIEF valve.
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