Instruction Manual
760000-C
November 2002
3-34 Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 CLD
NO/NOx flow balance
…
Figure 3-60. NO/NOx Flow Balance Menu
Since the sample flows through separate
paths in the NO and NOx mode of meas-
urement, there are differences in the flows
entering the reaction chamber of the two
modes. The CLD analyzer uses a correc-
tion factor in the NOx mode to compen-
sate for the reduced flow rate. This
correction factor can be entered manually
or it can be calculated by the analyzer us-
ing one of two methods. One is based on
adjusting to respond equally to a span
gas and the other is based on adjusting
for equal capillary pressure.
To start the automatic measurement and
flow balance calculation cycle, enter the
appropriate menu and follow the direc-
tions.
Figure 3-61. Calculate Factor Using
Pressure Ratio Menu
It is recommended to flow the gas at the
same pressure and flow rate as the sam-
ple gas.
b. Load/Save Module Configuration
From the “System Configurations and Di-
agnostic” menu (Figure 3-53, page 3-32),
select “Load/save configuration
(CM/MCA)…
This menu provides several functions to
send or load configuration data of the
analyzer through the serial interface.
These functions are only available if an
SIO with serial interface is installed.
NOTE
When loading configuration data all of
the current configuration in the mem-
ory will be overwritten.
Figure 3-62. Load/Save Configuration
(CM/MCA) Menu
If asked, confirm with the F2 (Yes) softkey
or cancel and go back to the menu page
with the F4 (Back…) or
←
softkey.
Send configuration to serial interface !
The configuration data in memory will be
sent through the serial interface of the
analyzer to an external computer or other
device.
Load configuration data from serial in-
terface !
Configuration data will be loaded into
memory from an external computer or
other device through the serial interface of
the analyzer. The current configuration in
memory will be overwritten.
CLD
7.50 ppm
HOME
NO/NOx flow balance
NOx correction factor: 1.0000
Calculate factor using pressure ratio…
Calculate factor using span gas response ration…
INFO
ESCAPE
CLD
7.50 ppm
HOME
Calculate factor using pressure ratio
This procedure will calculate the NO/NOx flow balance
correction factor by measuring the capillary head both the
NO pressure used in both the NO and NOx modes and
using the ratio between the two pressures as the correction
factor.
Press the CALC softkey to start the measurement and
calculation.
Status: Factor entered manually
INFO
ESCAPE
CALC
CLD
7.50 ppm
Measure
-- Load/Save Configuration (CM/MCA)
Send configuration to serial interface!
Load configuration from serial interface!
- BE CAREFUL with this function -
Replace current configuration with factory settings!
Back…
