PerkinElmer PINAACLE 900 Series, Руководство по оборудованию и обслуживанию для клиентов

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291
Graphite Furnace Maintenance for the PinAAcle 900T/900Z
Contact Cycles
Use this value to show the number of times that the furnace has been used since the
contacts were changed.
Click on Reset to reset the value to zero when you install new graphite contacts.
Check the Display warning message when cycles exceed check box to have a
warning message displayed when an analysis is started and the contact cycles have
exceeded a user specified number. The warning message will not prohibit a user
from performing an analysis, but rather serves as a reminder to the user that the
contacts should be inspected and, if necessary, replaced.
Conditioning the Graphite Tube
We recommend that you run the graphite tube conditioning program every time
that you change the graphite tube or platform. The conditioning procedure
removes adsorbed gases and surface contamination from the graphite, and
ensures reproducible performance.
After conditioning, it is good practice to verify that the tube and/or platform are
sufficiently clean for the element you wish to determine.
In order to do this, run your method for this element, but do not inject a sample.
Perform a ‘dry fire’ instead. Evaluate the results obtained. If the absorbance
value is too high for this element, heat the tube manually at 2500 °C for 10
seconds (see
Manually Heating the Graphite Tube on page 292 ) and then repeat
the "dry fire".
You may need to repeat this a few cycles to remove the contaminants
completely. Otherwise, change to a new tube.
1. On the
Toolbar
, click on
Furnace
.
2. In the
Furnace Control
window, click on
Condition Tube
.
The system uses a special furnace program to heat the tube to successively
higher temperatures.