Instruction Manual
760000-C
November 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Operation 3-25
Model NGA2000 CLD
CLD
7.50 ppm
Range 1 Factors
Manufacturer’s settings
Zero offset: 0.000000
Span factor: 0.000000
Stored settings
Zero offset: 524287.0
Span factor: 0.00021250
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INFO
RSTRMN
RSTRST
Figure 3-38. Range Factors -
Manufacturer’s/Stored Settings Display
Press the HISTORY (F4) softkey to view
the current stored factors versus the
manufacturer’s (factory) settings. Use the
RSTR MN (F3) softkey to restore the
manufacturer’s settings and the RSTR ST
(F4) softkey to restore the stored settings.
d. Unable
to
Calibrate
If the user is unable to calibrate the Ana-
lyzer Module (i.e., when ZERO or SPAN
is initiated, nothing happens), a possible
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:
1. Select the following from the Main
Menu: “Analyzer and I/O Expert
Controls & Setup,” “Analyzer Mod-
ule Set Up,” and “Calibration Pa-
rameters...”
2. Using
the
↓
arrow, select “Zero
Ranges:”, press ENTER and, using
the up/down arrows, toggle to
SEPARATE. Do the same for the
“Span Ranges:” selection. Do not
press ESCAPE at any time unless
retention of prior settings is desired.
3. Return to the “Main Menu” and
make the following selections: “Ana-
lyzer and I/O Expert Controls &
Setup,” “Analyzer Module Controls,”
“Zero/Span Calibration,” FACTORS
(F3) softkey, and Range 1 (2, 3, 4)
Factors (do Steps 4 and 5 for each
range).
4. Select “Zero Offset,” press ENTER,
adjust the value to 32700 with the
↑
and
↓
arrow softkeys, and press
ENTER. Do not press ESCAPE at
any time unless retention of prior
settings is desired.
5. Select “Span Factor,” press ENTER,
adjust the value to 0.00015 with the
↑
and
↓
arrow softkeys, and press
ENTER. Do not press ESCAPE
unless retention of prior settings is
desired.
6. Attempt to recalibrate the Analyzer
Module according to the procedure
outlined in Section 3-8c, page 3-23.
If recalibration fails, return to the
Range Factors menu, readjust Zero
Offset and Span Factor values, and
try calibrating again.