17
Filters
A number of different filter types are available from GMI. The
minimum requirement is a cotton particulate filter and a
hydrophobic filter which are incorporated in the probe handle
assembly supplied with the instrument. Filters must be
checked at frequent intervals and where appropriate changed
to ensure a clean sample path. If water is drawn into the
instrument any filter which has been contaminated must be
cleaned or replaced. See Filter Replacement in Section 4
OPERATOR MAINTENANCE.
Liquid Crystal Display (LCD)
The LCD shows the current gas readings in both analogue
and digital form together with operational and status
information. The display is protected by a toughened glass
cover. Backlighting is provided to enable the display to be
seen under low ambient light conditions.
Before Use Checks
The following checks should be carried out before using the
instrument on site:
•
The instrument is clean and in good condition.
•
The batteries have sufficient power left in them for
the intended use of the instrument.
•
The filters are clean and in good condition.
•
The sample line and any accessories are in good con-
dition and leak free.
•
All gas ranges are operational and zeroed correctly.
•
The calibration is still valid.
GENERAL INFORMATION
Summary of Contents for Oxygas 500
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Page 6: ...OXYGAS P 500 USER HANDBOOK iv...
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