XNX Universal Transmitter
Maintenance
118
EC Sensor Cartridge and Cell Replacement
Caution: For toxic ells, remove the shorting clip from the bottom of the cell prior to installation.
No shorting clip is provided with oxygen cells..
!
The serviceable sensor allows replacement of the cell inside the
sensor. The cell must be replaced with one of the same type as
the original.
When replacing oxygen (O
2
) sensor cells, the initial warm-up time
is between 10 and 15 minutes. This warm-up is required only
after sensor cell replacement.
Replacing the Sensor Cell
To replace the cell follow this procedure:
1. Unscrew the weatherproof cover, loosen the sensor
retainer locking screw, and unscrew the sensor retainer.
2. Remove the old sensor by pulling without twisting.
3. Unscrew the sensor cap.
4. Remove the old cell by pulling without twisting.
5. Verify that the new cell is the same type as the old one.
6. Plug the new cell into the sensor. Align the sensor pins
with the connector holes in the PCB.
7. Ret the sensor into the transmitter ensuring that the pins
are fully aligned before gently pushing it fully home.
8. Sensor warm-up will begin and the display will alternate
between two screens: “Fault 151” and “WARM.”
Figure 226. Sensor screens during warmup
9. Follow the procedure to accept the new sensor in the
Accept New Sensor Type section.
10. Recalibrate the sensor following the procedures in
the
Zero and
Span Calibration for EC/mV Sensors, and Searchpoint Optima
section
.
Transmitter
Sensor Retainer &
Locking Screw
3
2
1
4
5
6
New Sensor
EC Sensor Removal
Sensor Cap
Old cell
New cell
Sensor Cell Replacement
Figure 227. XNX EC sensor and cell replacement
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