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Instruction Manual
760007-A
July 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Service 4-1
Model NGA2000 PMD
PRESSURE
COMPENSATION
BOARD
NETWORK INPUT
DETECTOR
HOUSING
CASE
TEMPERATURE
SENSOR
FLOW SENSOR
COMPUTER
ANALYSIS BOARD
MODULE BOARD
SECTION 4
MAINTENANCE AND SERVICE
WARNING
QUALIFIED PERSONNEL
This equipment should not be adjusted or
repaired by anyone except properly quali-
fied service personnel.
4-1 OVERVIEW
PMD Analyzer components that may require
replacement include:
• All printed circuit board
• Thermal fuse inside Detector
• Case temperature sensor
• Flow sensor
• Power fuse
• Detector
• Module fan
The LED bi-cell assembly source required ad-
justment (rotation) anytime the Detector is
disassembled. Refer to Figure 4-3 on page 4-
3 for locations of these components.
4-2 PRINTED CIRCUIT BOARD REPLACEMENT
Refer to Figure 4-1 belowfor locations of the
Signal, Microprocessor, Power Supply and
(optional) Pressure Compensation Boards.
All boards are secured to a side of the ana-
lyzer module that folds out while interconnec-
tion wiring is still in place. Remove the
securing screws and fold out the entire panel.
To remove individual boards on the fold-out
panel, label and unplug all interconnection
wiring, and remove securing hardware. Re-
verse this procedure for installation.
Figure 4-1. PMD Module – Major Components