Instruction Manual

760004-A February 2002

Model NGA 2000 HFID

3-4 CALIBRATION

Calibration gas setup is as follows:

1.Set oven temperature setpoint.

2.Apply regulated air at a pressure between 10 and 25 psig.

3.Allow case, oven, and sample tempera- tures to stabilize.

4.Supply heated zero gas to sample inlet. Adjust external flow controller or throttle valve so that the sample inlet pressure is between 5 and 9 psig., 7 nominal.

5.Supply heated span gas to sample input. Repeat adjustment described in step 3. The reading of the sample pressure, oven, and sample temperatures should be the same as that used during the adjust- ment of the zero gas.

See Section 2-4c for a description of the method for choosing calibration zero and span gases.

To calibrate the Analyzer Module, introduce zero gas into the SAMPLE INLET, and do the following:

1.If more than one Analyzer Module is func- tional and the split Run Mode display is shown, press the DISPLAY softkey until the desired Analyzer's Run Mode display is acquired.

2.Press the MENUS softkey to enter the Main Menu.

3.Verify the fuel type in the Miscellaneous Control Parameters menu (under the Technical Configuration menu structure, select the following from the Main Menu: Diagnostic menus, Analyzer Module Di- agnostics and then Miscellaneous Control Parameters).

4.Verify the capillary type in the Analyzer Manufacturing Data menu (under the Technical Configuration menu structure, select the following from the Main Menu:

Technical Level Configuration, Service

Menus, Manufacturing Data, Analyzer

Module Data).

5.In the Calibration Gas List menu (from the Main Menu, select Expert Controls and Setup, Analyzer Module Setup, then Cali- bration Gas List), enter necessary data, including the Operational Sample Pres- sure and the Calibration Gas HC Re- sponse Factor. Common HC factors are: methane (CH4), 1.0, ethane (C2H6), 1.90, propane (C3H8), 3.00. These factors are not used to compensate the reading, but are used to select the proper preamp sense resistor.

6.Press HOME to re-enter the Main Menu, enter the Basic Controls menu, select de- sired range, introduce zero gas and allow its response to stabilize, press the ZERO softkey to enter the Analyzer Zero menu, press ZERO again and wait.

7.Press the SPAN softkey to enter the Analyzer Span menu, introduce span gas and allow its response to stabilize, press SPAN again and wait.

8.Repeat steps 6 and 7.

9.Press the HOME softkey to re-enter the Main Menu.

10.Press DISPLAY softkey for the Run Mode display.

If the user is unable to calibrate the Analyzer Module (i.e., when ZERO or SPAN is initiated, nothing happens), several possible solutions present themselves. One solution relates to the use of an incorrect gas for zeroing or spanning (e.g., using a high concentration gas to zero or a zero gas to span the Analyzer Module). Simply recalibrating with the appropriate gas(es) will not correct the problem because the ZERO OFFSET or SPAN FACTOR has been set to an extreme value in the proc- ess.

To remedy the problem, do the following:

3-4 Operation

Rosemount Analytical Inc. A Division of Emerson Process Management