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Instruction Manual
748374-F
March 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Troubleshooting 4-1
Model NGA2000 TO2
Sensor Cover
Indicator,
Electrolyte Level
Sensor Reservoir
Mounting Screws
(3 places)
Enclosure
Back Wall
Mounting Screws
(2 places)
Flow Sensor
SIDE VIEW
TOP VIEW
SECTION 4
MAINTENANCE AND TROUBLESHOOTING
4-1 OVERVIEW
CAUTION
QUALIFIED PERSONNEL
This equipment should not be adjusted or
repaired by anyone except properly qualified
service personnel.
WARNING
PARTS INTEGRITY
Tampering with or unauthorized substitution
of components may adversely affect safety
of this product. Use only factory-approved
components for repair.
The TO2 Analyzer Module requires very little
maintenance during normal operation.
The sensor in the TO2 utilizes a liquid electro-
lyte. When measuring dry gases, it may be
necessary to replenish the liquid by adding dis-
tilled or deionized water.
The sensor is designed to hold at least 100 cc
of electrolyte. Typically, bone dry sample gas
can extract approximately 5-10 cc of water per
month from the sensor. It is recommended to
check the electrolyte level every 3-4 months to
assure that the electrolyte level is within the ac-
ceptable operating limits as indicated by the la-
bel on the reservoir section of the sensor.
The TO2 analyzer module is equipped with a
low electrolyte alarm which indicates when re-
plenishment of the sensor is required. Please
refer to the Platform manual for details on con-
figuring alarms.
CAUTION
REFILLING SENSOR
When refilling the sensor, only use distilled
or deionized water. Do not use electrolyte or
tap water as they can cause damage to the
sensor. Take care not to overfill.
Figure 4-1. Trace Oxygen Analyzer Sensor Assembly