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Ventilator Alarms
Occlusion Alarm
6.5.3
An Occlusion alarm is activated by an obstruction in the breathing circuit. The ventilator will
attempt to relieve the pressure that has built up in the circuit and will not deliver additional
breaths until the situation is resolved. The alarm resets when the occlusion is resolved and breath
delivery will resume at that point.
Sustained Occlusion Alarm
6.5.4
A Sustained Occlusion alarm is activated if the Occlusion alarm is not cleared within 10 seconds
or two breath periods, whichever is shorter. The ventilator will attempt to relieve the pressure and
will not deliver additional breaths until the situation is resolved. The alarm resets when the occlu-
sion is resolved and breath delivery will resume at that point.
Check Circuit or Prox Line Alarm
6.5.5
The Circuit Check or Prox Line alarm indicates that the circuit has become disconnected or the
proximal pressure tubing is disconnected, kinked, or has water in it. Check the circuit for discon-
nects or problems with the prox line pressure tubing/prox line filter.
Note:
Be sure to keep the prox inline filter clean and dry at all times.
Flow Sensor Disconnect/Failure Alarms
6.5.6
The Flow Sensor Disconnect and Failure alarms indicate that the on-airway flow sensor has
become disconnected, the tubing has been partially blocked with water, or the flow sensor is no
longer working.+
Pressure Control Setting Not Reached Alarm
6.5.7
The Pressure Control Setting Not Reached alarm is activated by inadequate pressure rise during
pressure-controlled breaths. Check for leaks and that the slope/rise is set to a fast enough level.
No External Power Alarm
6.5.8
The No External Power alarm is activated by disconnection from the power cord or a power inter-
ruption. The ventilator will automatically switch to the Power Pac battery pack or backup battery.
Pressing the Audio Paused/Reset button will clear the alarm.
6-8
+ only available on the HT70PM when the on-airway flow sensor is in use
Operator's Manual
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