Fluke Biomedical VT Mobile User Manual
Page 65
Maintaining and Troubleshooting the VT MOBILE
7
7-5
Table 7-1. Troubleshooting the Analyzer (cont.)
Problem
Possible Cause
Corrective Action
Compliance of breathing
circuit tubing is causing a
compressible volume loss.
Determine the breathing circuit compliance to
calculate the expected volume loss due to
compressibility of the gas and expansion of
the hose.
You are using the
Analyzer with humidified
gases. Condensation on
the flow sensors causes a
calibration error on the
flow measurement.
Run dry air through the flow sensor for 10 to
30 minutes to allow the screen mesh to dry.
Do not use the Analyzer with condensing
humidified gases.
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
R
while
the affected signal is displayed. For example,
you can zero low pressure while the Analyzer
displays the low-pressure screen.
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.
Barometric pressure is
incorrect
Barometric pressure offset
drift
Enter correct barometric pressure.
You observe no flow
measurement with flow
applied.
Wrong flow sensor is
connected
Connect the right flow sensor. See
Specifications.
No observable airway
pressure.
Wrong flow sensor
connected.
Connect the right flow sensor.
Ventilator parameters seem
incorrect.
Analyzer in circuit
backwards
Ensure the inlet is near to the Y piece.
Analyzer takes a long time to
establish communications
with PC software.
This is normal.
If the Analyzer does not eventually
communicate with the PC software, ensure the
cable is correctly connected and that the PC
hardware can support the communication port
selected.
Make sure no other device is trying to use the
serial port on your PC. Close any software that
may be using the serial port. Make sure that
Windows
recognizes the serial port in the
Control Panel. Restart the VT for Windows
software.
Troubleshooting