SECTION 5
SERHT50NA A0808 5-3
FRONT PANEL TEST/ALARM CHECK
1. Connect the ventilator to A.C. power.
2. Press the On/Standby button once. The ventilator performs a
self-test and then switches to the Settings condition. During the
self-test, verify operation of the audible alarm and all LED
indicators, numeric and alphanumeric displays. Verify that:
• All single color and dual color indicator LEDs are functional
and are at the same intensity.
• All 7-segment LEDs are functional.
3. Press all buttons and verify that all buttons are functional and
can be operated with the same force.
NOTE: Before contin
uing to the next step, verify that the ventilator
has been in Settings or On mode for at least 5 minutes.
4. Disconnect the ventilator from A.C. power.
5. Place the ventilator in the Standby condition by pressing the
On/Standby button twice.
6. Let the shutdown alarm continue for at leaset two minutes
before silencing it with the alarm Silence/Reset button.
7. If the alarm does not continue strongly for at least two minutes,
contact Newport technical support.
8. Connect the ventilator to A.C. power.
SYSTEM LEAK TEST
1. Set the HT50 to Standard Test Settings.
2. Check the 3 thumbscrews of the inlet filter cover in order to
ensure no leakage around the cover.
3. Connect the vacuum (negative pressure) gauge to the gas inlet.
4. Start ventilation. The required pressure reading must be 120
mmHg or greater. A failed test is characterized by either (1)
failing to achieve 120 mmHg negative pressure, or (2) a rapid
drop in the vacuum during exhalation.
NOTE: During exhalation phase, a decrease in negative pressure
on the negativ
e pressure gauge is normal.
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