Preparing Samples
5–10 TA I
NSTRUMENTS
DSC A
UTOSAMPLER
CE
Autosampler CE
Run Capacity
When you use the Autosampler CE and control-
ler to automate sample loading and unloading,
you must create an Autosampler CE (AS) run
sequence for each tray of samples. An AS run
sequence is composed of a series of runs, each
of which requires a reference pan and sample
pan in the cell (see Terminology in Chapter 1
for explanations of the terms AS run sequence
and run). When you set up your tray, you must
consider the maximum number of runs that can
be set up in an AS run sequence, known as the
Autosampler CE s run capacity.
If you are using the LNCA for cooling experi-
ments, the maximum number of cooling runs in
an AS run sequence is limited by the amount of
liquid nitrogen in the LNCA tank. The rate at
which the liquid nitrogen is used up depends, of
course, on your method: the temperature you
use, how long you hold the cell at a particular
temperature, the rate of change in temperature,
and so on. In general, you can expect to get
approximately 10 to 15 cooling runs with one full
LNCA tank of liquid nitrogen when your method
cools to the lower limit of 150
o
C. If you have
an autofill LNCA, you will need to allow suffi-
cient delay times between runs for the LNCA to
refill from the bulk storage tank. You are
encouraged to experiment using your own
thermal methods to determine what you can
expect from your system.
The maximum number of runs in an AS run
sequence is 62 (the number of positions in the
Autosampler CE tray). Thus, you can run 62
samples in an AS run sequence if you manually