MAN0597 ISSUE 08 - 02/04
2302M5030
4. OPERATION
34
This indicates that the sensor output of the indicated
channel has drifted negative. In severe cases of
sensor negative drift, a Warning 51 (Excessive
Negative Drift) will be shown. Please see Appendix A
– Warning Codes for further details on this warning
message.
WARNING
If -0.0 Vol.% for the CO
2
sensor channel is permanently
displayed, a sensor zero (during boot procedure) or a zero
calibration needs to be performed in clean air. The alarm
level A1 for the CO
2
range must not exceed 0.5 Vol.%.
4.1.3 Confidence Signal
To ensure correct operation the instrument monitors itself and
will confirm correct operation by giving an audible and green
visual confidence signal once every 30 seconds. The
confidence signal is given when the instrument is able to
detect gas (for example the confidence signal will not be given
during pump or sensor calibration phases, or if the sensors are
in warm-up).
There is a configurable option to silence the audible
confidence signal but the visual confidence signal will still
operate. If the instrument is in a low battery condition the
confidence signal will occur twice every 30 seconds.
Note: The audible confidence signal is the primary indication
that the instrument is functioning correctly. It is therefore
strongly recommended that this feature not be disabled.
4.1.4 Go/No Go Option
A configurable option is available which replaces the numeric
values with a
" symbol when everything is OK and & when
there is or has been an alarm or fault, as shown below. All
alarms operate as normal, but other functions and menus are
disabled.
-0
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