46
BÜCHI
Fat Determination
B-820/B-821
5 Operation
Determination with the Autosampler
Sample No.
Enter the sample number (from the sample weight table) with
which the determination should be started. Confirm it with
“ENTER”; the cursor moves to the next row. The correspond-
ing sample identification (Name), the injection number (here
the second injection) and the sample-specific determination
mode (“spec.corr.”) will be shown in the display.
Vial No.
Position of the sample (sample vial) in the sample carousel of
the Autosampler, in which the sample (Sample No.) that is to
be determined is located.
It must be ensured that the sample number corresponds to
the content of the sample vial. To facilitate the overview, sample
numbers are selected to be the same as the vial numbers.
Switching off
Can be set to “
YES
” or “
NO
” with “OPTION”. “
YES
” means
that the temperature will be reduced to room temperature
after the end of the last determination, and that the gas feed
for the hydrogen and synthetic air will then be switched off via
the valves. These settings are equivalent to a “STAND-BY”
mode (energy-saving mode). If the system finds itself in “STAND-
BY” after the last determination, the display will indicate “
The
determination finished correctly
”.
“
The determination finished correctly
”
Here, the system will be in a pressure-free condition. The
following work can be carried out:
–
Column change
–
Septum change in the injector
–
Refilling of the gas saturation vessel with formic acid, 85%
(purity)
“
NO
” means that all temperatures and the gas feed take on
the settings of the “READY” mode after the end of the last
determination (see Chapter 5.1). The “READY” LED indicates
that the system is ready to carry out measurements.
Start
The determination is started with the “START” function (the
cursor must be on “START”) and “ENTER”. This automatically
initiates the rinsing of the syringe and the selection of the
corresponding sample vial. If a “Preheating” should be carried
out, or the system is carrying out a conditioning (“Running”
LED illuminated), the number of seconds remaining before
the first injection can take place will be indicated in the “Start”
line (in this case, 62 seconds).
Sample no:
5
p H2
55 kPa
Vial no:
5
p air
50 kPa
Switch off:
y e s
T oven
1 4 0 ° C
Start after 62s
T inj.
2 2 0 ° C
Main menu
T FID
2 6 0 ° C
s p e c . c o r r
Name: cream cheese
