Addendum

748461-B April 2003

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 Barometric Pressure menu display, or an external Digital voltmeter.

Display Method

With no sample inlet lines connected and the instrument exhaust ported to atmosphere, adjust R1 on the 661380 Interface board until the Barometric Pressure reading on the

Model NGA2000 PMD, NDIR

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.

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Addendum – Vaisala Transducer

Rosemount Analytical Inc. A Division of Emerson Process Management