ENERAC 700, Instruction Manual

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a. Water-trap system
A disposable 1-micron fiber filter is located in the bottom section of the
condensation 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.
b. Thermoelectric-condenser system
The primary filter is a cylindrical filter for collecting particulates. Replace it
when it becomes dirty. When installing a new filter be sure to observe the
correct flow orientation, as indicated by the large arrow on filter.
The disc filter, if equipped, is to prevent condensation from entering the unit.
If this filter absorbs too much moisture it will stop any further flow to the
analyzer. If a replacement filter is not available, the wet condensation filter
should be removed and dried with compressed air.
An additional membrane filter, if present, is located inside the thermo-
cooler’s white plastic cap.
3. Sensor replacement
Sensor replacement should be an infrequent operation, perhaps once every two
years or more. The best way to check a sensor’s performance is to feed span gas
and observe the sensor’s response.