Table of Contents
Advertisement
VT Plus HF
Operators Manual
Error Message
Airway Pressure Out of Range
Low Pressure Out of Range
High Pressure Out of Range
Linearization Tables Invalid
Negative Flow Detected
No Load Applied
AD Buffer Overrun
B-2
Table B-1. Error Messages (cont.)
Description
Airway-pressure measurement
causes a measurement greater
than the maximum (or less than
the minimum) reading of the
analog-to-digital converter.
Low-pressure measurement
causes a measurement greater
than the maximum (or less than
the minimum) reading of the
analog to digital converter.
High-pressure measurement
causes a measurement greater
than the maximum (or less than
the minimum) reading of the
analog to digital converter.
Either of the linearization tables
for the high- and low-flow
sensors are invalid at startup. If
this condition is detected,
linearization tables aren't used to
calculate flow. Accuracy could
diminish by 3 to 10 %.
An average negative flow is
detected in either inspiratory
only or expiratory only breath
detect mode.
The difference between min and
max airway pressure is less than
5.0 cmH
O while in expiratory
2
only breath detect mode.
The Analyzer cannot keep up
with the data input. The Analyzer
can buffer a few seconds of data
when it is busy changing
screens and such.
Corrective Action
Ensure that pressure is within
the specified range of the
Analyzer.
Ensure that pressure is within
the specified range of the
Analyzer.
Ensure that pressure is within
the specified range of the
Analyzer.
Call Service.
If error message repeats, the
Analyzer is installed in the
ventilator circuit backwards.
Ensure the INLET flow
connection on the Analyzer is
nearest to the INSPIRATORY
hose from the ventilator.
Ensure that a load (Test Lung) is
installed in the ventilator circuit
and that the circuit is not open to
air (i.e. an unconnected hose).
Decrease lung compliance so
that the change in airway
pressure is greater than 5
cmH
O during the breath. A
2
better solution, use the bi-
directional breath-detect mode.
If the error message appears
several times during normal
monitoring (i.e. no keys are
being pushed) call factory for
service.
Advertisement
Table of Contents
