Technical Manual
XNX Universal Transmitter
Section 4 - Maintenance
106
4.2.2 Replacing with a Different Cartridge Type
To replace the cell with a cell for a different gas, 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. Plug the new cell into the sensor, taking care to align the
sensor pins with the connector holes in the PCB.
6. Ret the sensor, taking care to align the sensor pins with
the connector.
7. Ret the sensor retainer, tighten the locking screw, and
ret the weatherproof cover.
8. The transmitter will enter sensor warm-up mode. However,
due to the change in sensor cell type, the transmitter
will not enter monitor mode until the unit has been
recongured. The display will show the sensor warm-up
screen:
Figure 229. Sensor screens during warmup
Note the message “G:TBV:O2”. “TBV” indicates that the
operator must recongure the transmitter to recognize
the new sensor cell. “O2” will reect the target gas of the
new cell, i.e., H2S, NO2, etc. The display will also alternate
the warm-up screen with the Fault 151 screen. This
indicates that the communication between the transmitter
and the original cell is no longer recognized. This fault
condition will clear after the transmitter has been properly
recongured.
The reconguration of the XNX for a new cell/target gas is
achieved through Accept New Sensor Type. Recalibrate
the sensor following the procedures in Section 3.2.2.
4.2 XNX EC Sensor Cartridge Replacement