Koehler K44100, Руководство по эксплуатации и инструкция, Страница: 13 / 20

K441XX Automatic Non-Woods Metal Noack Evaporative Apparatus
Operation and Instruction Manual
K441XX-Manual
- 12 -
otherwise, even an incomplete analysis running
longer than 5 minutes will be recorded.
3. The status bar will describe the progress of the
analysis. In the bottom right hand side of the
screen the graph will display the temperature
data.
4. An alarm will sound along with a full screen
notice three minutes before the end of the
analysis. See Figure 12 below. Touch the
screen to shut off the alarm and close the full
screen notice. The status bar will display the
countdown to the end of the analysis.
Figure 12: End Analysis Screen
5. As the analysis is approaching the end, prepare
3 cm deep water bath at ambient temperature.
This will be used to cool down the crucible;
therefore it should be large enough to hold a
sufficient amount of water. Sufficient cool down
of the crucible will take approximately 30
minutes so accommodate a water bath where
the crucible can safely rest without interfering
with regular laboratory activities. (A laboratory
sink would be sufficient so long as no
interference occurs).
6. When the analysis time reaches 60 minutes
(the countdown reaches 0), a new alarm will
sound. Touch the screen to stop the alarm,
then CAREFULLY remove the crucible and
place it in the above mentioned water bath. Let
the crucible rest in the bath for 30 minutes.
NOTE: WHILE REMOVING THE CRUCIBLE
AND PLACING IT IN THE WATER BATH
MAKE SURE THE SAMPLE DOES NOT
SPLASH THE CRUCIBLE’S COVER.
7. After 30 minutes, carefully dry the outside of the
crucible then, unscrew the cover.
NOTE:
This step should be performed without
tilting the crucible.
THE SAMPLE SHOULD
NOT SPLASH THE CRUCIBLE’S COVER.
8. Reweigh the crucible with the remaining (un-
evaporated) part of the sample to the nearest
0.01g.
9. In
the
Results Browser
enter the final weight.
The analyzer will calculate the final result.
6.4 Analysis of the Results
Subtract the empty crucible’s weight from the end
result in order to maintain the weight of the
remaining sample. The result of the following
formulas will provide the value of Noack
Evaporation Loss (Test Method D5800)
Method A:
(B-A) – (C-A)
Evaporation Loss = ――――――――
B-A
Where:
A= Empty Crucible weight
B= Crucible plus Sample weight
C= Crucible plus Sample after 1
hour of heating
Method B:
[(M
1
-M
2
)/M
1
] x100
Where:
M
1
= sample weight before the test
M
2
= sample weight after the test
The final result is given to the nearest 0.1%
on both methods
NOTE:
The analyzer is able to perform all
calculations on the above mentioned formulas, the
operator is only required to:

Note and introduce the empty
crucible’s weight

Note and introduce the sample’s
weight before the test

Note and introduce the crucible’s
plus sample’s weight after the test
The analyzer automatically gives the result
correlation between the two procedures as
prescribed in the ASTM D5800 method:
Result on B= 1.030 x Result on A
Result on A= 0.970 x Result on B