Impact / Impact Pro / Impact Pro IR Operating Instructions
73
Peak Maximum, or minimum, measurement since
switch on.
Pellistor Registered trade name for a commercial device
– A very small sensing element used in catalytic
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 while 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 while 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 Explosive 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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