Specifications

748420-A
August 1999
16
Trace Oxygen Analyzer Module
Rosemount Analytical NGA 2000
3
S
TARTUP AND
O
PERATION
Under the Technical Level Configuration sub-menu, select
Diagnostic menus...
and then
select
Analyzer Module Diagnostics…
. In the Analyzer Module Diagnostics sub-menu
select
Calibration Parameters...
. In the Advanced/Expert Calibration sub-menu select
Gas
Scale Factor...
. To use the GSF, enter the volumetric percentages of each component
present in the sample gas. To view more background components, press the MORE
softkey. The total must add up to 100 or a new factor will not be computed. If you have a
background component which is not shown in this menu, please consult the factory for
assistance.
Once you have entered all the background composition information, move the cursor to
Compute new adjusted gas scale factor!
and press the
↵
key and the analyzer module will
automatically calculate the new gas scale factor.
3.6 C
ALIBRATION
The TO2 analyzer module is fully factory calibrated using certified gas standards prior to
shipment. If the analyzer is operated within its specified operating conditions, no calibration
is required. The zero calibration is very stable and does not require checking more than
once a year. Depending upon the nature of your application, it may be beneficial to verify
the span calibration of the analyzer module every 3-4 months. The following procedure
illustrates how to initiate a zero/span calibration.
Under the Expert Controls sub-menu select
Expert Analyzer Controls and Measurement…
,
set the Range Number to the range that will be used during sample analysis. Return to the
Main Menu by pressing the HOME softkey.
Introduce zero gas into the SAMPLE INLET, and, after a stable reading is reached, do the
following:
1. Move the cursor to Technical Level Configuration... and enter. Select Diagnostic
Menus…, then Analyzer Module Diagnostics…, and then Calibration parameters... and
enter.
2. Select the User zero calibration... to enter the User zero calibration menu.
Note:
Before proceeding any further, be sure that the zero value is stable and valid. The
zero may take 24 hours or longer to achieve stable zero for the low ranges.
3. Move the cursor to the Press the select key for user zero calibration now!
4. Press the
↵
key. The new zero calibration will now be entered.