Fluke Biomedical VT Plus HF - Manual (Page 138)

VT Plus HF
Operators Manual
C-2
Table C-1. Troubleshooting (cont.)
Problem Possible Cause Corrective Action
Out of Range messages appear Measured signals out of
specified range Ensure that all pressures and
flow rates are within the
Analyzer specified limits.
Units are not set to those used
for the range specifications. User
mistakenly assumes that range
is not exceeded due to readings
in the different units. For
example, monitoring pressures
in psi while trying not to exceed
a range specified in cmH2O.
Ensure the units selected are the
same as the specified limits.
Unit calibration is incorrect If problem persists, call Service.
Tidal Volumes are erratic in bi-
directional breath detect mode Breath detection threshold set
too low. Noise from ventilator is
causing false breaths. Set the breath detection
threshold to a higher value.
Tidal volumes different than
expected User's expected value was
incorrect. Review expectations.
Flow baseline drifts, causing a
false non-zero flow reading
when flow was actually zero.
Zero the flow reading. Consider
using the auto-zero mode.
Analyzer is out of calibration. If possible, verify calibration with
a 3-liter calibration syringe.
Ensure gas settings are correct.
With the Analyzer in the bi-
directional breath detect mode
and the gas correction mode set
to ATP, stroke syringe such that
flows are near the midrange for
the flow sensor. Compare the
Analyzer tidal volume to
calibration syringe volume. If
difference is out of specification,
return unit for calibration.
Gas settings are incorrect.
Review Analyzer gas settings.
Correction mode is set to BTPS
or STPD instead of ATP. Set gas mode to appropriate
setting for your application. Most
applications may require the
ATP mode