BIRD MARK 7 - Ceramic Switch Chatter Test; Mark 7 A Apneustic Flowtime Calibration

PROBLEM POTENTIAL CAUSE CORRECTIVE ACTION
Maximum flow through
orificed adapter less than:
Mark 7: 34cmH。O
Mark 7A: 30cmH。O
1. Pressure escaping between
pressure compartment and
centerbody gasket.
2. Leak in the INSPIRATORY
FLOWRATE system.
1. Check and correct.
2. Insure tube 6 is secured to
centerbody and venturi
(ambient compartment).
Replace with new Flowrate
Valve (P/N 1198).
3. Leak around main diaphragm
and retaining ring.
3. Remove ambient compartment
and apply detecting solution.
Correct leak.
4.0 INSPIRATORY POWER DRIVELINE
4.1 Remove orificed adapter from the end of the
breathing assembly.
4.2 Disconnect INSPIRATORY POWER DRIVE-
LINE from the respirator. Connect male end of
the Inspiratory Power Driveline Gauge (P/N
6758, 0-60 psig) into the INSPIRATORY POWER
DRIVELINE socket on the respirator. Reconnect
the INSPIRATORY POWER DRIVELINE to the
4.3 Cycle respiratory “ON”. Pressure on the test
gauge should read between 12-25 psig.
44 If the pressure, observed is not within the
acceptable range, proceed to Step 4.6, Trouble-
shooting INSPIRATORY POWER DRIVELINE.
4.5 If the gauge pressure (12-25 psig) is within
the acceptable range, remove the test gauge
and reconnect the INSPIRATORY POWER
DRIVELINE to the respirator.
female end of the gauge.
4.6 Troubleshooting INSPIRATORY POWER
DRIVELINE.
PROBLEM
POTENTIAL CAUSE CORRECTIVE ACTION
Cannot achieve at least 12
psig.
1. Leak in breathing assembly
connection.
2. Source pressure less than 50
psig (static).
3. Leak in INSPIRATORY POWER
DRIVELINE system.
1. Secure.
2. Adjust source pressure and ©
system pressure.
3. Mark 7 — Apply leak detecting
solution to both ends of tube
#1.
Mark 7A — Apply leak
detecting solution to both ends
of tube #12.
Pressure greater than 25
psig.
1. Source Pressure greater than
50 psig (static).
1. Adjust source pressure and
system pressure.
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