GE MOA 280i, Operation And Maintenance Manual

Page: 122 / 211

GE Analytical Instruments ©2006
11-10
DLM 14291 Rev. A
A N A L Y S I S S E T U P
O P E R A T I O N
I N T E R V A L
MO D E S
R E P O R T I N G I N T E R V A L
C O M P O R T
P R I N T E R
C O M P O R T I N T E R V A L
C u r r e n t : 1 / 1 6 s e c
C h a n g e t o : 1 / 4 s e c
↓ ↑
s c r o l l s e l e c t i o n s
E N T a c c e p t C L R e s c a p e
•
Select Sensitivity.
•
Select High or Low Sensitivity depending on
the application (in most cases sensitivity
should be set to High).
The NOAnalysis Liquid program should be used
for the collection and processing of data from
the NOA. The COM Port Interval is normally set
at 1/4 second for data collection. Using a faster
interval (1/8 or 1/16 second) does not provide
any significant advantage and results in larger
data files. Slower intervals (1/2 or 1 second) will not provide sufficient resolution
to accurately fit the peak and should only be used if the computer cannot collect
data at 1/4 second. To set the COM port interval:
•
Press CLEAR to return to the Analysis Setup Menu.
•
Select Interval.
•
From the Reporting Interval Menu, select COM PORT.
•
Use the Arrow buttons to scroll to 1/4 second and press ENTER to save.
The printer is not used for liquid measurements and should be set to OFF.
Deproteinization Procedures
For both the Nitrite Measurement (Chapter 12) and Nitrate Measurement (Chapter
13) samples containing high concentrations of protein can either be directly
analyzed and the reagent replaced when foaming occurs or the samples can be
deproteinized prior to analysis. Any deproteinization procedure can be used and
two techniques that have been successfully employed are listed. Contamination
from nitrite or nitrate can occur during these procedures, especially if the