Heath Consultants Gasurveyor 500 Series - Manual (Page 17)

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Non-Latching means that the alarms clear automatically
when the gas level falls below the alarm limit.
For both latching and non-latching alarms, it is possible
for both audible and visual indicators to be either On or
OFF independent of each other.
Construction
The instrument is housed in a tough, impact resistant,
moulded case made of carbon loaded 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
instrument 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.
Batteries
Disposable Alkaline (LR20) Dry Cell Batteries
Alkaline batteries provide approximately 15 hours
operational life at ambient temperature of 20
o C (68 o F).
When the batteries are low or exhausted it is necessary to
fit 4 new batteries. Do not mix old and new batteries.
An indication of the battery condition is displayed after
power on and during warm-up, with status shown as either
OK or LO. If LO condition is displayed, a maximum
battery operational life of 120 minutes remains. During
GENERAL INFORMATION