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For fresh alkaline batteries the voltage displayed will be approximately 6 Volts.
It will gradually drop with use until at 3.9 volts a “BATTERY LOW” warning will
appear. You can estimate the remaining time by observing the battery voltage.
For NiMH rechargeable batteries the battery voltage will stay at approximately 4.8
volts for a long time and then drop rapidly.
To replace the batteries, remove the two screws that secure the top section of the
analyzer’s back plate. The batteries are housed inside a battery holder that is
mounted on the back of a pc board. Remove the depleted batteries and replace
them with fresh ones observing carefully the polarity indicated. Replace the top
section of the back plate.
NOTE: Remember that the NO sensor needs a tiny amount of electrical power,
even when the analyzer is off. Do not allow the batteries to discharge completely.
Consequently, you must not leave the analyzer without battery power for any
length of time. When replacing the batteries you can use the analyzer within five
minutes, if you don’t take longer than two minutes to replace the batteries. If the
analyzer has been without power for a long time, you may need to wait for a few
hours after installing fresh batteries before the NO sensor is fully conditioned.
This warning is for the NO sensor only.
B. Filter replacement
If you use the standard condensation trap, there is a disposable 1-micron fiber filter
located in the bottom section of the trap assembly. Its function is to prevent soot
particles from reaching the analyzer pump and sensors.
To replace the filter, disconnect the condensation trap from the probe. Unscrew the
bottom section of the condensation trap and replace the filter with a new one.
Make sure the O-ring is seated properly when you screw back the bottom section.
If you use the thermoelectric cooler, the disposable fiber filter is located inline with
the cooler outlet hose.
You must replace the filter when it becomes discolored. Never operate the
analyzer without the filter. Frequency of filter replacement depends on the type
of fuel used. For natural gas fuel you will probably need to replace the filter once a
month. For coal fuel you will need to replace the filter every few days.
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