SECTION 3
SERHT50NA A0808 3-13
Internal Battery Charge Level Meter
The Int. Battery Charge Level meter is located beneath the Paw
meter. If the needle is in the red when the test button is presed the
battery charge is low. You should use an external power source.
The blue area indicates medium to full battery charge. Each
battery use time is different based on your conditions. The
numbers on the Paw meter do not reflect the percent of charge.
NOTE: The battery charge level is best maintained by keeping
the HT50 contin
uously plugged into an external power source.
Push to Unlock Button and Auto Lock Indicator
Auto Panel Lock can be enabled or disabled via User Set Up (see
pg 3-29). When Auto Lock is set to “Enabled” in User Set Up and
the ventilator is in On condition and 30 seconds have elapsed
without pressing any buttons, the Auto Lock function is
automatically activated and the (Auto Lock On) LED illuminates
green. When Auto Lock is active, all touch buttons (except
Silence/Reset and Int. Battery Test) are locked, preventing
accidental changes.
Press and hold the Push to Unlock button for at least one second
to unlock the panel and enable the activation of all touch buttons
for adjustment. An audible beep sounds and the LED is
extinguished. When 30 seconds have elapsed without pressing
any buttons, the Auto Lock is automatically activated again.
NOTE: Auto Panel Lock is factory preset to “Disabled” (off).
Silence / Reset
The Silence/Reset button has three functions:
1. Silencing alarms: Press the Silence/Reset button to silence all
alarms for 60 seconds. When the Silence/Reset indicator is
illuminated, all alarms are silenced except Device Alert alarm.
Press the Silence/ Reset button again to cancel the silence
period.
2. Clearing alarm messages: Press the Silence/Reset button to
clear all alarm messages in the Message Display Window and
to release latched LED indicators when the cause for the
alarm is no longer present.
3. Toggle Buzzer Volume (alarm loudness) between Loud and
Quiet: Press and hold the Silence/Reset button when there
are no alarm messages displayed to toggle the alarm audible
volume between loud and quiet. The alarm will sound at the
new setting.
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