MAN0597 ISSUE 08 - 02/04
2302M5030
10. GLOSSARY
98
Gas Detector or Monitor Refers to equipment designed to alert the
user to potentially hazardous concentrations
of gas in the monitored atmosphere.
Hard Zero When a hard zero is performed using
either the built-in calibration menu or
the PC software then any adjustments
will remain in place when the
instrument is turned off. Performing a
hard zero followed by an Enforcer
calibration, instrument menu span or
PC calibration will adjust the calibration
and change the calibration due date.
Hazardous Areas Areas where there is the possibility of
the presence of an explosive mixture of
flammable gas or vapour and air are
known as ‘Hazardous’ and other areas
as ‘safe’ or ‘non-hazardous’. Any
electrical equipment used in hazardous
areas must be tested and approved to
ensure that, in use even under fault
conditions, it can not cause an
explosion.
In Europe, hazardous areas are defined
as follows:
Zone 0: An area where an explosive
mixture is likely to be present at all times,
under normal operating conditions.
Zone 1: An area where an explosive
mixture is likely to occur in normal
operation.
Zone 2: An area where an explosive
mixture is not likely to occur in normal
operation, and if it does it is only for
short periods.
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