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Instruction Manual
748332-F
April 2003
3-8 Startup and Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 NDIR
3-7 ROUTINE OPERATION
Set the NDIR Analyzer Module for desired
operating range. Zero and span the module,
and then supply sample gas to the SAMPLE
INLET at the rear of the module. The NDIR
Analyzer Module will now automatically and
continuously analyze the sample stream.
As a check of instrument performance, the
operator should keep a log of zero/span
status.
Maximum permissible interval between
calibrations depends on the analytical
accuracy required. A frequency of once every
24 hours is recommended initially, and that
practice should be continued unless
experience indicates that some other interval
is more appropriate.
Readout accuracy is directly proportional to
change in barometric pressure (i.e., a change
in cell pressure of 7.6mm of mercury will
result in a readout error of about 1% of
reading). Therefore, if barometric pressure
changes significantly, a recheck of calibration
against a span gas is advised. Also, an
optional Pressure Compensation Board is
available that electronically compensates.
The Analyzer Module will not allow the user to
increase the upper limit of a range beyond the
"maximum range" software setting. To
change the "maximum range" value, select
the following from the Main Menu: Technical
Configuration Menu, Service Menu,
Manufacturing Data, Analyzer Manufacturing
Data. Select Maximum Range, and use the
arrow keys to scroll the indicated value. The
same applies for "minimum range" setting.