Specifications

Trace Oxygen Analyzer Module

Rosemount Analytical NGA 2000

748420-A

August 1999

AINTENANCE AND

ROUBLESHOOTING

4.2 F

USES

Remove power to the Analyzer Module prior to fuse replacement. To replace the Power

Fuse, locate the fuse cover on the front panel of the Analyzer Module, as shown partially in

Figure 2-3. Push and turn the fuseholder cover 1/4 turn counterclockwise. Remove and

replace the fuse as required. There are no other fuses in the Analyzer Module.

4.3 E

LECTROLYTE

EPLACEMENT

Before replacing the electrolyte, be sure to turn off and disconnect all gas connections to the

analyzer module. Turn off or disconnect the power to the analyzer module.

To replace the Sensor electrolyte, remove the Analyzer Module from its mounting location

and place on a sturdy work surface. Be careful not to tilt the module from its horizontal

position as the Sensor contains liquid that can spill. Remove the cover of the Analyzer

Module and locate the 5 mounting screws that hold the Sensor Assembly onto the Analyzer

Module chassis (see Figure 4-1). Remove the 5 screws and retain. Do not lose the screws -

they have metric threads.

Disconnect the Sensor signal connector (J5) and the Flow Sensor connector (J6) from the

power board. Remove the complete Sensor Assembly from the Analyzer Module. Remove

the black sensor cover and invert the Sensor Assembly over a suitable receptacle. Flush

the Sensor twice with deionized water. Dispose of the discarded electrolyte and rinse water

in accordance with National, Federal, State and Local regulations.

Refill the Sensor with electrolyte as instructed in Section 2.2.1. Reinstall the Sensor

Assembly and reconnect J5 and J6 to the power board.

4.4 S

ENSOR

EPLACEMENT

If the Sensor cannot be regenerated by the addition of water or the replacement of

electrolyte, or if the Sensor shows signs of leakage, it may be necessary to replace the

Sensor. To replace the Sensor, remove the Sensor Assembly and remove the electrolyte

as described in section 4.3 above. Reinstall the black sensor cover to catch any residual

electrolyte. Invert the Sensor Assembly and locate the four (4) mounting screws which hold

the Sensor to the Sensor Assembly mounting plate. Remove and retain the four screws.