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Addendum
748461-B
April 2003
Addendum – Vaisala Transducer Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 PMD, NDIR
2 of 2
5. Connect the instrument sample inlet tub-
ing to the Vaisala Pressure Inlet port.
6. Enable the Barometric Pressure Com-
pensation and the Use Local Reading op-
tions via the Expert Controls – Analyzer
Module Diagnostics – Barometric Pres-
sure Compensation menus of the instru-
ment. The instrument will automatically
detect and report the ‘Presence’ of the
Pressure Compensation Option.
1-2 ADJUSTMENT PROCEDURE
Circuit adjustment can be made using Baro-
metric Pressure menu display, or an external
Digital voltmeter.
Display Method
With no sample inlet lines connected and the
instrument exhaust ported to atmosphere, ad-
just R1 on the 661380 Interface board until
the Barometric Pressure reading on the
Barometric Pressure menu reads the correct
ambient air pressure.
DMM Method
Connect the DMM (+) to TP1 on the 661380
Interface board, (-) to TP2. Set the DMM to
measure mVDC. With no sample inlet lines
connected and the instrument exhaust ported
to atmosphere, adjust R1 on the Interface
board until the DMM reads 0.000 Vdc ± 0.001
V. The instrument is now calibrated at 1
ATM.
1-3 HIGH ALTITUDE VERSION OPTION
For applications where the instrument is to be
used above 5400 Feet (MSL) an alternate
transducer option is available from the factory.
This version consists of a Vaisala model
PTB100B transducer (900-1100 hPa range).
Please contact the factory if you require this
option.