BIRD MARK 7 - Pressure-Cycled Limit Control Calibration; Starting Effort (Sensitivity) Calibration and Troubleshooting

CALIBRATION
AND
TROUBLESHOOTING
SECTION
7:
CALIBRATION AND TROUBLESHOOTING
PROBLEM
POTENTIAL CAUSE CORRECTIVE ACTION
Minimum flow through
orificed adapter lower
than:
Mark 7: 18cmH,0
Mark 7A: 14cmH,0
1. Leak in breathing assembly
connection.
2. Driving pressure less than 50
psig with MASTER SWITCH
“OFF”
3. Airway manometer not
calibrated to zero.
4. Leak in INSPIRATORY
FLOWRATE systern.
5. Faulty INSPIRATORY
FLOWRATE valve.
1. Secure connections.
2. Increase to a siatic 50 psig.
3. Recalibrate.
4. Insure tube 6 is secured to
centerbody and venturi
(ambient compartment).
Mark 7 — Apply leak detection
solution (i.e. snoop) to
connections on Tube 6
(ambient compartment) with
respirator “ON.” Correct any
connection that bubbles
continuously.
Mark 7A —- Apply leak
detecting solution to
connections on tubes 16 and
51 (ambient compartment) with
respirator “ON.” Correct any
tube or connection that
bubbles continuously.
Use Y2” open end wrench to
remove valve to check
condition of small O-ring (P/N
0114) on end of valve. Replace
if necessary.
Mark 7A — Apply leak
detecting solution to both ends
of tube 12 in pressure
compartment. Correct leaks.
5. Replace with new Flowrate
Valve (P/N 1198).
Minimum flow through
orificed adapter higher
than:
Mark 7: 24cmH,O
Mark 7A: 18cmH。O
1. Static driving pressure greater
than 50 psig.
2. Cam stop not positioned at
5:00 o'clock.
3. Gas escaping from tubing or
connections in the pressure
compartment.
4, Gas escaping into pressure
compartment from old or worn
O-rings on ceramic switch.
5. Gas escaping around worn O-
ring on EXPIRATORY TIME
valve (P/N 0114).
1. Reduce to 50 psig.
2. Readjust.
3. Remove pressure compartment
and apply leak detecting
solution on all tubes and
connections. Correct leak.
4. Remove ceramic switch from
centerbody, clean and install
new O-rings (P/N 0193).
5. Use 2" open end wrench to
remove valve to check
condition of small O-ring on
end of valve. Replace if flat, cut
or worn.
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