Model NGA2000 PMD

Instruction Manual

760007-A July 2003

SECTION 4

MAINTENANCE AND SERVICE

WARNING

QUALIFIED PERSONNEL

This equipment should not be adjusted or repaired by anyone except properly qualified 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

MODULE BOARD

COMPUTER

ANALYSIS BOARD

PRESSURE

COMPENSATION

BOARD

FLOW SENSOR

The LED bi-cell assembly source required adjustment (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 analyzer module that folds out while interconnection 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. Reverse this procedure for installation.

NETWORK INPUT

DETECTOR

HOUSING

CASE

TEMPERATURE

SENSOR

Figure 4-1. PMD Module – Major Components

Rosemount Analytical Inc. A Division of Emerson Process Management

Maintenance and Service 4-1