Heath Consultants Gasurveyor 500 Series - Manual (Page 19)

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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
condition and leak free.
$
All gas ranges are operational and zeroed correctly.
$
The calibration is still valid.
GENERAL INFORMATION