Heath Consultants Gasurveyor 500 Series - Manual (Page 35)

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OPERATOR MAINTENANCE
2) Remove the cotton particulate filter and discard.
3) Remove the hydrophobic filter.
4) Clean the probe handle to make sure that it is free
from dirt and water.
5) Fit a new cotton particulate filter.
6) Fit the hydrophobic filter. The yellow label on the
filter fits against the yellow label on the probe
handle.
7) Reassemble the probe handle assembly.