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Instruction Manual
748374-F
March 2003
3-4 Startup and Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 TO2
Introduce zero gas into the SAMPLE INLET,
and, after a stable reading is reached, do the
following:
1. Move the cursor to Technical Level Configu-
ration... and enter. Select Diagnostic
Menus…, then Analyzer Module Diagnos-
tics…, 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 sta-
ble 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.
5. Press the ← key to return to the previous
menu.
6. Introduce a suitable span gas into the
SAMPLE INLET and allow reading to stabi-
lize. Move the cursor to the User span cali-
bration... line and press the ↵ key.
7. Move the cursor to the Span gas concentra-
tion: line and press the ↵ key. Enter the
correct span gas value by using the ↑↓ keys
to change value and the ←→ keys to select
position. Press the ↵ key to enter the new
span gas value.
8. Move the cursor to the Press the select key
for user span calibration now! and press
the ↵ key. The new span calibration will
now be entered.
9. Press the ← arrow key to return to the pre-
vious menu.
10. You can view the new calibration data in the
Calibration data display screen. To access
this screen go to the Expert controls and set
up sub-menu and select Analyzer module
set up... From the Analyzer module set up
sub-menu select Calibration... and from the
Advanced/Expert calibration sub-menu se-
lect Calibration data display... This screen
is a view only display and data cannot be
edited from this screen.
11. If for any reason you want to restore the
original factory calibration data, you can do
so from the Advanced/Expert calibration
sub-menu (see step 9 above for directions
to this sub-menu). Select Restore factory
calibration! and the original values will be
restored.
NOTE:
Do not alter data in the Load factory calibra-
tion data... sub-menu except when replacing
sensors. Any changes made to this sub-
menu will become the new default restore
factory calibration! values.
12. Press the HOME softkey to re-enter the
Main Menu.
13. Press DISPLAY softkey for the Run Mode
display.
If you are unable to calibrate the module for
some reason, see the NGA Reference manual
for a list of possible causes and solutions. The
most likely cause is the use of incorrect span
gases.
3-7 ROUTINE OPERATION
The TO2 Analyzer Module is designed to ana-
lyze the sample stream continuously. Normally,
it is never powered off except for servicing or for
a prolonged shutdown.
Maximum permissible interval between
calibration checks depends on the analytical ac-
curacy required, and therefore cannot be speci-
fied. Initially, the instrument should be checked
at least once every 3-4 months. This practice
should continue until experience indicates that
some other interval is more appropriate.
For details as to the general operation of the
NGA analyzer module software, and the use of
IO modules with the TO2 module, see the Plat-
form Components manual.