PerkinElmer OilExpress 4, User Manual

Page: 138 / 152

138 . OilExpress 4 System User's Guide
The results obtained for one
or more properties are
unexpected / unacceptable
(continued)
Air was aspirated with sample
(using fixed heights, actual
height of sample in container
was slightly different from
sampling height in the software)
Check the sampling heights on the
Autosampler Setup dialog, and in
the Samples screen (if specified)
against the actual sample heights
NOTE: The Cell Fill Check (enabled
by default) can be used to
identify when the flow cell
has not been filled
adequately. Check the
settings
on the Batch
Options dialog
Background was collected with
flow cell in the beam – sample
shuttle is not installed correctly
Install the sample shuttle in the
Spectrum Two. Refer to
Installing
the Sample Shuttle on page 124
Ensure that the sample shuttle
connects properly with the
connection on the rear of the
Spectrum Two sample
compartment
Empty cell correction is not
configured correctly
If using the empty cell correction,
check that the appropriate empty
cell spectrum is selected. If
required, repeat the empty cell
spectrum
NOTE: If using the
FT
‑IR
In-Service Lubricants
Control Standard, the
empty-cell correction must
be enabled to achieve the
specifications on the
certificate provided
The flow cell pathlength is not
correct
Check the results for a control
sample. If these are not correct,
check the flow cell pathlength has
been calibrated
Refer to
Calibrating the Pathlength
of the Flow cell
on page 109
If required, dismantle the flow cell
for cleaning. Reassemble the flow
cell, repeat the empty cell
spectrum and then calibrate the
flow cell
Refer to
Flow Cell Maintenance
starting on page 96
The flow cell is dirty or has a
build-up of material on the
windows
Check the results for a control
sample. If these are not correct,
run the Cell Contamination Check.
Refer to System Checks on page 92
If required, clean the flow cell.
Refer to
Flow Cell Maintenance
starting on page 96