SECTION 3
SERHT50NA A0808 3-5
FRONT PANEL CONTROLS & INDICATORS
Front panel controls that have corresponding LED indicators are
included with the description of the control.
The HT50 front panel is shown in Figure 3-1 on pg 3-3.
On / Standby
This button toggles between the following conditions:
Standby (if attached to external power, the battery is being charged)
g Setting (allows setting of control parameters) g On (enables
ventilation)
gg
Standby
Standby: The HT50 is dormant and ventilation is not enabled. If
attached to e
xternal power, the Ext. Power/ Charging Int. Battery
LED is lit green, indicating that the internal battery is being charged.
The On/Standby indicator is not lit.
Setting: Pressing the On/Standby button once changes the
v
entilator from Standby to Setting condition.
NOTE: There is approximately a two second delay in going from
Standb
y to Setting condition. During this time, the HT50 performs a
self test and will light all displays on the front panel.
During Setting condition, all adjustable LEDs are lit. This allows
the operator to preset and adjust controls prior to ventilation. The
On/Standby indicator is not lit. The Message Display Window
shows “Press ON to Vent,” suggesting that the On/Standby button
needs to be pressed if you want the HT50 to start ventilation.
On: Pressing the On/Standby b
utton once more changes the
ventilator from Setting to On. In the On condition, the HT50 is
ventilating and the On/Standby indicator is lit green.
Pressing the On/Standby button twice while in On condition turns
the ventilator from On to Standby.
MODE Control
The MODE control buttons enable the user to switch between the
following operational modes:
• A/CMV
• SIMV
• SPONT
In A/CMV and SIMV, mandatory breaths can be pressure
controlled or volume controlled. A green LED indicates which
operational mode is active.
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