Honeywell Impact Series Operating Instructions And Maintenance Manual page 73

Peak
Pellistor
Poison resistant
PPB
PPM
RFI
Safe Area
Soft Zero
STEL
TWA
UEL
UL
%VOL
%v/v
Impact / Impact Pro / Impact Pro IR Operating Instructions
Maximum, or minimum, measurement since
switch on.
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'.
Capability of a catalytic sensor to reduce the
effect of inhibiting substances or contaminants,
such as silicones.
Pa r t s p e r b i l l i o n c o n c e n t ra t i o n s i n t h e
atmosphere.
Par ts per million concentrations in the
atmosphere.
Radio frequency interference.
Work area in which there is no danger of
contamination with explosive gases.
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.
Short Term Exposure Limit, usually monitored
over 15 minute periods
Time-Weighted Average
Upper Explosive Limit
Underwriters Laboratories (USA)
Concentration of gas, measured in percentage
by volume.
Another way of representing % VOL
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