45
C. Condensation removal
At the end of a measurement, shake the probe vigorously to drain it of any
condensation. Remove any condensation that has been trapped in the top section of
the condensation trap and allow it to dry thoroughly before storing it.
D. Sensor replacement
To access the gas sensors you must carefully remove the bottom section of the
back plate on which the sensor manifold housing is mounted. This will expose the
four gas sensors, the combustibles sensor and the oxygen sensor (see figure 4). All
gas sensors are mounted directly on the printed circuit board.
Make sure the unit is off before attempting to disconnect one of the sensors.
If you receive an error message for one of the sensors during instrument operation,
do not attempt to replace the sensor immediately. Instead, wait a few minutes and
then autozero the analyzer again. If you get an error message again, investigate and
determine if moisture has entered the sensor area. If so, wait a few hours for the
moisture to evaporate and autozero the sensor again. If you get a sensor failure
then you must replace the sensor.
To replace the sensor, remove the back plate as explained previously. Pull the
malfunctioning sensor out of the printed circuit board. Be careful not to bend the
mounting pins.
Replace the sensor with a new one. If the sensor to be replaced is a CO, NO
2 or
SO
2 sensor, first remove the shorting spring from the two sensor pins.
Each sensor has a different pin arrangement to prevent it from being
accidentally inserted in the wrong socket pin configuration! Be careful not to
bend the sensor pins when mounting the new sensor.
Replace the bottom section of the back plate that houses the manifold.
Wait the following time periods before autozeroing the analyzer:
OXYGEN SENSOR 10 MINUTES
CO SENSOR 30 MINUTES
NO SENSOR 24 HOURS
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