GMI PPM Gasurveyor 500, User Handbook Manual

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PPM GASURVEYOR 500 USER HANDBOOK
8
Geiger Indication
The Geiger provides indication that as the gas
concentration increases, the sounder (if activated) and the
LED, pulse at an increasing rate. When the PPM
Gasurveyor 500 has PPM Flammable or Search range
selected, or is switched on in full autorange mode then,
by default, the visual Geiger indication is enabled and
the audible Geiger indication is disabled.
To enable the audible Geiger indication, press and hold
Button Two .
A further press and hold of Button Two will increase
the audible level. A further press and hold of Button Two
will return to visual only Geiger indication.
Note: When Search mode is selected, the pump operates
at an increased speed. If Search mode is selected when
the pump is switched off, the pump then reactivates.
Construction
The instrument is housed in a tough, impact resistant,
moulded case made of polypropylene.
The top panel is protected by a stainless steel top plate
covering a toughened glass LCD cover.
The battery pack is sealed and attached to the main in-
strument body by means of 2 stainless steel hexagonal
screws.
The instrument is sealed against dust and water to IP54
standard. The sensors are protected from dust and water
by membrane and cotton filters.