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FirstCheck+ 1, 2, 3 & 5000
Instrument Displays
Background Zero Reference
When in Survey mode, pressing the ZERO key alternates
between 'Relative' and 'Absolute' modes. There is a constant
level of detectable gas in ambient air, w hich is detectable with
FirstCheck+. 'Absolute mode' displays the entire sensor signal .
'Relative' mode 'removes' the background signal and sets the
'Zero' point at an artificial level.
Alarm arrows
The arrows represent the importance level of the alarm. The single arrow represents the lower alarm and
the two arrows represent the upper alarm.
Application
When the symbol is present the instrument is in 'Health & Safety' mode. When it is absent the instrument reverts
to 'Survey' mode. Please see Application section of this manual for more information (page 24).
Display Screens Explained
Graph Screen
Allows the viewing of real-time measurements in graph format relative to the
set alarm levels.
When in 'Survey' mode (see page 24) the type of gas being
detected, the measured units, the peak hold and real - time
readings are also displayed.
Additional information such as alarm levels and battery status
can be viewed by pressing and holding the E NTER key.
When in 'Health & Safety' mode (see page 24) the on screen information
is slightly different as STEL and TWA calculations are displayed in figures
and the graph remains in real time. Again additional information can be
viewed by pressing and holding
the ENTER Key.
Ion Scie nce Lt d
Upper and lower
alarm levels
Indicates that 'Health & Safety' mode is sele cted
Page 15 of 53
Relative
Absolute
Ion Science L td
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