Newport HT50 - Page 84

SECTION 7
SERHT50NA A0808 7-3
Low proximal pressure
(Paw) and low flows
at Gas Output connector.
PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION
Pressure relief valve or emergency
intake valve leaking.
Air inlet filter clogged.
Internal leak in the pump (i.e. ruptured
diaphragm, leaking one way valve).
Check both valves for proper sealing.
Perform the Pressure Relief Valve
calibration (Section 5).
Replace air inlet filter.
Check diaphragm, replace if damaged.
Tighten 4 screws connecting the pump to
the left side. If problem persists, replace the
Pump Assembly.
“Motor Fault” Device
Alert alarm, or
no Device Alert alarm,
but proximal pressure
is rising slower than
expected.
Blocked air inlet.
High FIO
2
selected on Air/O
2
mixer,
and oxygen supply is depleted.
Replace air inlet filter.
Verify sufficient oxygen supply. Replace as
needed. If problem continues, remove
Air/O
2
mixer. If problem is resolved, replace
Air/O
2
mixer. If problem persists, replace
Pump Assembly.
Unstable baseline.
Breathing circuit leak.
Exhalation valve is not calibrated.
Internal solenoid is not functioning
properly.
Main board not calibrated correctly.
Check breathing circuit for leaks and/or
proper connections. Make certain “star”
tubing is not a direct connection to any
HT50 connectors.
Calibrate the exhalation valve (Section 5). If
the valve fails calibration, replace. If valve
passes but problem persists, try a new
valve.
Verify that both ends of the tubings
connected to the solenoid are secure. Verify
that the tubing from the Gas Output
connector and the internal pressure
transducers are secure. Calibrate the
exhalation valve. Retest for baseline
stability. If the problem persists, replace the
Pump Assembly
(Note: Solenoid is part of the pump.)
Calibrate entire HT50 (see Section 5)