MAN0597 ISSUE 08 - 02/04
2302M5030
10. GLOSSARY
100
sensors and sometimes also called a
‘bead’ or a ‘siegistor’.
Poison resistant Capability of a catalytic sensor to
reduce the effect of inhibiting
substances or contaminants, such as
silicones.
PPB Parts per billion concentrations in the
atmosphere.
PPM Parts per million concentrations in the
atmosphere.
RFI Radio frequency interference.
Safe Area Work area in which there is no danger
of contamination with explosive gases.
Soft Zero When a soft zero is performed (i.e. the
autozero on startup) any adjustments
will only remain in place whilst the
instrument remains switched on.
Performing a soft zero (autozero)
followed by an Enforcer calibration or
instrument calibration menu span (i.e.
not a menu zero first) will adjust the
calibration whilst the instrument
remains switched on but will not change
the calibration due date.
STEL Short Term Exposure Limit, usually
monitored over 15 minute periods
TWA Time-Weighted Average
UEL Upper Exposure Limit
UL Underwriters Laboratories (USA)
%VOL Concentration of gas, measured in
percentage by volume.
%V/V Another way of representing %VOL
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