Specifications

748414-A
August 1999
22
Heated Flame Ionization Detector Analyzer Module
Rosemount Analytical NGA 2000
3
STARTUP AND OPERATION
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 Calibration Gas List), enter necessary data,
including the Operational Sample Pressure and the Calibration Gas HC Response
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 desired
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 process.
To remedy the problem, do the following:
1. Verify that correct zero and span calibration gases are being used properly. If so,
attempt to recalibrate according to instructions at the beginning of section 3.4, ensuring
that the oven, sample and case temperatures and displayed measurement reading are
stable before initiating the calibration routine. If incorrect gases were used in the initial,
failed calibration, skip to Step 2.
2. Make the following selections from the Main Menu: Expert Controls and Setup,
Analyzer Module Setup, then Calibration Parameters. Disable Calibration Adjustment
Limits.
3. Recalibrate the analyzer module according to instructions at the beginning of section
3.4, ensuring that oven, sample, and case temperatures and displayed measurement
reading are stable before initiating the calibration routine.