Filter
Top Products
Instruction Manual
760008-A
September 2001
4-2 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA 2000 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
CAUTION.
REFILLING SENSOR
When refilling the sensor, only use dis-
tilled or deionized water. Do not use elec-
trolyte or tap water as they can cause
damage to the sensor. Take care not to
overfill.
a. Refilling
To add water:
1. Remove the top cover of the ana-
lyzer module.
2. Unscrew the black sensor cover.
3. Slide the cover back just enough to
allow the neck of the fill bottle to fit
into the sensor reservoir.
4. Add distilled or deionized water us-
ing the fill bottle provided with the
analyzer module. Fill to approxi-
mately midway between the min and
max level indicators on the sensor
label. Be careful not to spill water,
splash electrolyte or overfill sensor.
5. Replace the sensor cover securely.
6. Replace the top cover of the ana-
lyzer module.
If the electrolyte alarm is activated but the
sensor shows sufficient electrolyte, the
electrolyte may have been contaminated
by substances present in the sample
which are chemically incompatible with
the sensor or electrolyte. If this should
occur, the electrolyte must be drained and
replaced with fresh electrolyte.
Refer to Section 4-2b for the proper pro-
cedure for replacing electrolyte.
Several other components may require
replacement. These are discussed in the
following sections.
Figure 4-1. Sensor Assembly