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Operation
Detective+
III. Operation
3.1 Switch On
Ensure the unit is in clean air. Press the 'ON' button to switch on the
Detective+. The instrument will display the message 'Crowcon Detective+' and
the serial number. The unit will test the red alarm LED, sounder and alarm beacons. Press the UNMARKED button to silence the alarm. Note: if the unit is in
the presence of a hazardous gas the alarm will continue to operate. If alarms
are configured to mute (see MUTE in section 4.2, Configuration Options) then
the alarm will not sound and the alarm LED not flash during the switch on
process.
After a short pause the display will change to 'Testing System…' and display
the current battery voltage. If the current date is past a preset calibration due
date, then the instrument will display ‘Calibration Due’. See section 3.6 for
configuration options. If there are different sensor modules in the instrument
compared to when it was last used (possibly indicating sensor failure) the message 'Sensors changed?' will be displayed. If the instrument’s configuration
has been lost or corrupted, then the message 'Loading default data' will be
displayed. With all three of these error/warning messages, the condition must
be accepted by pressing the UNMARKED button, indicated on the display with
the word CONTINUE above it.
Calibration due?
Continue
The instrument can alarm on instantaneous gas levels, and on both short and
long term Time Weighted Average gas exposure levels. Note that the Time
Weighted Average toxic gas exposures are reset to zero when the instrument
is switched off.
When the battery reaches a low level, an operational unit will display a low battery warning. Note: if the battery is too low the unit will not switch on.