
GAS ANALYZER 351
INSTALLING NOx SENSOR
The NOx sensor module requires replacement every two to three years based on frequency
of usage and amount of NOx in the gas sample. The Gas Analyzer indicates when a new
NOx sensor is required.
To replace the NOx Sensor, do the following:
1. Remove power from the Gas Analyzer.
2. Remove the screw on the NOx cover plate using a
1
⁄
16
" hex head.
3. With one hand pressing the tab against the side of the Gas Analyzer, use the other hand
to lift the old sensor out vertically.
4. Remove new NOx sensor from its case. Remove red cap from edge connector. Discard
the old NOx sensor.
5. Slide the new sensor into the base unit. The latch will snap over the sensor after it has
seated fully in the base.
6. From the <MAINTENANCE> menu, select <7: INSTALL NOx SENS>.
7. Perform a Leak Test to check system integrity.
8. Reattach the NOx access cover.
NOTE
The new sensor is marked with its activation date on its label. It
comes preactivated because of testing prior to shipping.
SENSOR
SCREW
COVER
NO
x
FIGURE 13. Replacing the NOx Sensor
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