Section 2 Detective+
Display options
The instrument may be configured into alternative display modes, by the DISPY
option (see DISPY in section 4.2, Configuration Options). The ON button can
be programmed to switch between modes.
The possible display modes are:
Normal: All gas values, units and names are displayed in real time.
Average: The average gas reading since the instrument was switched on is
displayed for toxic sensors. This is indicated by flashing 'avg' with
the sensor name. Non-toxic sensors will display their normal gas
level.
Off: Display reads 'MONITORING' whilst a safe condition is perceived,
and flashes 'GAS HAZARD and EVACUATE AREA 'in alarm condi-
tion.
TWA Toxic: This display mode only affects toxic sensors, and is indicated by
the letters 'TWA' flashing with the sensor name. The gas value
displayed will be the current long-term exposure level. Non-toxic
gas sensors will display their normal gas level.
Peak hold: This options affects the displayed gas value for all sensors, and is
indicated by the letters 'pk' flashing with the sensor name. The
highest gas level that has been read since instrument switch on
will be displayed, or in the case of oxygen, the lowest level read.
The peak that has been retained may be reset to the current gas
level by pressing the UNMARKED button. The peak gas level will
then be displayed again from then on.
In addition to the messages described above, if alarms are muted the message
‘MUTED’ will flash with the sensor name and units.
3.3 Overrange
If a flammable sensor’s signal is out of range then the instrument may be
configured, via a PC and the Portables PC software, to either flash the relevant
numbers on the display, or to display a message of the form 'SENSOR FAILURE'
and the name of the failed sensor. The alarm sounder will activate. This type
of error could indicate a high gas level or sensor failure. Calibration should be
checked after such a warning.
Operation Detective+
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