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FirstCheck+ 1000, 2000, 3000 & 5000
Instrument Displays
Peak Hold
Peak Hold is a numerical measurement that indicates the peak or maximum reading of that selected gas
sensor and is displayed to the right of the above symbol. The Peak reading can be reset by pressing and
holding the ENTER key for 5 seconds
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, which 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 displayed the instrument is in Health & Safety mode. the symbols absence indicates that the
instrument has reverted to Survey Mode. Please see the Application section of this manual for more information
st
(„1
PC Software‟).
Large Number Readout Screen
Enables the viewing of real-time measurements in large numerical format for easy
viewing in difficult conditions. Additional information such as alarm levels, battery
status and a peak hold reading can be viewed by pressing and holding the ENTER
key. When in Health & Safety mode the STEL and TWA alarm levels and calculated
values are shown when holding the ENTER key.
Small Multiple Readout Screen
Similar to the large single readout screen format, the small multiple readout screen
enables simultaneous viewing of all 5 sensor readings as numerical results. When
viewing the multiple readout screen, pressing and holding the ENTER key reveals
additional data such as the measurement units (i.e. ppm or %.)
When in Survey mode, readings are real-time. When in Health & Safety mode the
VOC, H
S and CO readings are the calculated STEL and TWA values. Use the UP and
2
DOWN keys to move between the STEL and TWA values.
Function Menu
Once selected use the UP and DOWN keys to highlight the function you require and
press ENTER to select. Many features can be adjusted in this section including
gas selection, zone maintenance, data transfer and alarm levels. Details of these and
other functions are to be found on the following pages.
.
Upper and lower
alarm levels
Indicates that 'Health & Safety' mode is selected
Page 15 of 45
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Relative
Absolute
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