E8500 Instruction & Operations Manual
version 1.017
Page 42 of 49
B. Condensation removal
Some water vapor in the stack gas may condense inside the extraction probe and
sampling line. However, any remaining excess water vapor in the sample gas will
condense inside the thermoelectrically operated chiller, which is located inside the
analyzer right behind the Sample In connection. All this water condensation will collect
inside the small water trap that is located at the bottom of the chiller assembly. It will
then be automatically removed by the peristaltic pump, which operates intermittently to
discharge the water through the bottom of the analyzer.
C. Sensor replacement
This should be an infrequent operation, since the gas sensors have a typical life of
several years.
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, then investigate and
determine if moisture has entered the sensor area. If so, wait a few hours for the
moisture to evaporate and then autozero again. If the sensor failure persists then most
likely the gas sensor needs to be replaced.
The location of the gas sensors on the manifold is shown in the figure in Chapter 6.
To access the gas sensor compartment on the analyzer, open up the analyzer as
detailed on the previous page.
To replace a sensor locate its correct position on the manifold. Carefully lift the small PC
board that is mounted on top of the sensor. Grab the sensor with your fingers and lift it
twisting it out of its bayonet fitting.
Take a new sensor. Remove any springs that may be shorting the sensor pins. Install it
on its mount and connect the small PC board on top of it.
Replace the top section of the case and secure it with the four screws.
Wait the following time periods before auto-zeroing the analyzer:
O
SENSOR 30 minutes
CO SENSOR 30 minutes
NO SENSOR 24 hours
NO
SENSOR 30 minutes
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