Fluke Biomedical VT Plus HF - Manual (Page 140)

VT Plus HF
Operators Manual
C-4
Table C-1. Troubleshooting (cont.)
Problem Possible Cause Corrective Action
Flow or pressure measurement
is not equal to zero when zero
flow or pressure is applied. Baseline drift of pressure
transducer Zero the affected signal by using
the zero key while the affected
signal is being displayed. For
example, low pressure can be
zeroed while the low-pressure
screen is currently displayed.
No message appears to remove
flow when attempting to zero
flow. Appears that system will
not zero flow. No message
appears. Auto zeroing mode is enabled.
The Analyzer is zeroing flow, but
no message is supposed to be
displayed, because the Analyzer
uses valves to switch to the
unused flow port This is normal. Because the auto
zero mode is enabled, the
Analyzer assumes that the
unused flow sensor can be used
to obtain the zero reading.
Ensure the unused flow sensor
has zero flow when the auto
zero mode is enabled.
Zeroing flow results in
unexpected flow readings or an
error message. Flow was not zero. Ensure that there is no flow
when zeroing the flow sensor.
Auto zero mode was enabled
and the unused flow sensor had
a non-zero flow present. Whenever the auto zero mode is
enabled, ensure that there is no
flow on the unused flow sensor.
Barometric pressure is incorrect. Barometric pressure offset drift Enter correct barometric
pressure.
No flow measurement is
observed when flow is applied. Wrong flow range is selected From the flow screen, ensure
that the range (low vs. high flow)
matches the range depicted on
the side panel of the Analyzer for
the port where the flow is being
applied.
No airway pressure is observed. Wrong flow range (low vs. high
flow) selected. From the flow screen, ensure
that the range (low vs. high flow)
matches the range depicted on
the side panel of the Analyzer for
the port where the flow is being
applied.
Pressure is negative when a
positive pressure is applied. Pressure is being applied to the
(-) connection instead of the (+)
connection. Ensure that pressure is applied
to the correct connection.
Ventilator parameters seem
incorrect. Analyzer in circuit backwards Ensure the inlet side of the
Analyzer is connected closest to
the inspiratory hose from the
ventilator. In bi-directional mode,
this means the inlet is near to
the Y piece.