Universal ATR Sampling Accessory User’s Guide . 17
Obtaining a spectrum of a liquid sample
1.
To view or change any of the instrument parameters, select
Instrument
from the Setup
menu.
The Setup Instrument pages are displayed in the Dialog Pane at the bottom of the
workspace. Figure 6 on page 10 shows the Setup Instrument Basic tab.
2.
If you need to collect a background spectrum, ensure that the top-plate is clean and
then click
, on the toolbar, to collect a background spectrum.
Spectrum automatically alerts you when you need a new background, and can be
configured to request a new background at set intervals (on the Setup Instrument Data
Collection tab).
NOTE:
If you want to collect a background that will be added to the Sample View and can
be saved separately, then select Background as the
Scan type
on the Setup
Instrument Basic tab.
3.
If your sample is volatile or non-viscous, continue the procedure below; otherwise,
place a drop of your sample on top of the crystal and go straight to step 11.
4.
Push the pressure arm back, until it is clear of the top-plate.
5.
Slide the medium size shoe over the end of the shaft until it clips into place.
6.
Place an empty volatiles cup in the center of the UATR top-plate, over the crystal.
7.
Swing the pressure arm across, so that the shoe is positioned directly above the cup.
Figure 10 Using the pressure arm with a medium shoe to position the
volatiles cup
8.
Screw down the pressure arm gently, until the shoe just meets the cup.
This ensures that the center of the cup is positioned exactly over the crystal.
9.
Loosen the pressure arm, so that it is clear of the cup, and then swing it back, until it is
clear of the top-plate.
