Emerson NGA2000 TO2 instruction manual Routine Operation

Instruction Manual

748374-F March 2003

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.

3-4 Startup and Operation Rosemount Analytical Inc. A Division of Emerson Process Management