Instruction Manual
760000-C
November 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Operation 3-23
Model NGA2000 CLD
CLD
7.50 ppm
-- Analyzer Zero --
Are you sure?
You must have zero gas flowing through the analyzer.
Calibration time: 0 s
Measurement range number: 1
Zero ranges TOGETHER
Calibration status: READY
Error message for last zero: CAL OK
HOME
ESCAPE
INFO
ZERO
CLD
7.50 ppm
-- Zero/span calibration --
Measurement range number: 1
Zero gas concentration: 0.0 ppm
Span gas concentration: 10.0 ppm
Sample flow: 1300 ml/min
Raw measurement signal: 5216063.5
Measurement gas: NO
NO/NOx toggle!
Status: READY
Result…
Calibration adjustment limits: Enabled
HOME
FACTORS
INFO
SPAN
ZERO
The “Calibration time” begins to count af-
ter the calibration is started to show the
elapsed time.
Press the ZERO (F3) [SPAN (F4)] softkey
to begin the calibration. The “Calibration
status” will display ZEROING-WAIT and
the “Calibration time” clock will count the
seconds. After the signal has stabilized
the calibration will finish. If the signal does
not stabilize within the timeout period
(See Section 3-8a, page 3-21), the cali-
bration will fail and another attempt will be
started automatically. Make sure that the
proper calibration gas is flowing.
c. Expert
Controls
Calibration
This method allows the user to perform a
zero or span calibration for each of the
four ranges, enable or disable the calibra-
tion adjustment limits, view the results,
and view or change the Factors that the
analyzer uses to adjust the zero and span
concentration reading.
In the “Expert Controls” menu (Figure
3-12), set the desired measurement range
number to be calibrated. Change the
measurement mode using the “NO/NOx
toggle!” control.
Select “Zero/Span calibration…” menu
line.
Figure 3-33. Zero/Span Calibration
Menu
The zero and span gas concentrations
(set in the calibration gas values menu)
are displayed. See Section 3-8a, page 3-
21 to change the values.
The sample flow rate is displayed along
with the raw measurement signal. The
sample flow rate should be in the range of
200 – 2200 ml/min.
The raw measurement signal can be used
to set the FACTORS described in Section
3-8c, page 3-23.
The “Measurement gas:” tag shows the
current measurement status as NO or
NOx.
Press the ZERO (F3) [SPAN (F4)] softkey
to begin the calibration.
Figure 3-34. Analyzer Zero Display
The “Calibration status” will display ZE-
ROING-WAIT and the “Calibration time”
clock will count the seconds. After the
signal has stabilized the calibration will
finish. If the signal does not stabilize
within the timeout period (See Section 3-
8a, page 3-21), the calibration will fail and
another attempt will be started automati-
cally. Make sure that the proper calibra-
tion gas is flowing. See Section 3-8a,
page 3-21 for “Calibration adjustment lim-
its.”
Calibration Results
The last calibration results can be viewed
by selecting the “Result…” submenu from
the “Zero/span calibration” menu (Figure
3-33, page 3-23). The “Zero/span diag-
nostic data” screen will be displayed.
