5.6 Measurement process
D
ISPLAY
The instrument display is informing the user continually about the
actually measured gas concentration (referring to preset normalized
parameters) and other conditions while in measuring process.
1 2 6
3
3 5 4
1. Measurement results are shown in g/m³ or g/m
3
(only in this example including
ppm). If the symbol “<”precedes the measured value, the real measured value lies
below the indicated value. On the other hand, if the symbol “>” should appear,
the real value is above the over-all measurement range. Normally in this case also
the limit value alarms are triggered (if set accordingly).
2. The text "Zone 1" refers to the selected measuring point (here: Measuring point
1). This description of the measuring point can hold up to 12 characters and can
be set by authorized personnel.
3. The arrow symbol on the left side of the measured values indicates the unit,
which is referred to for averaging / average value storage, alarm state and other
procedures (here: mg/m
3
).
4. The symbols on the right of ‘A1’ and ‘A2’ inform about the state of the measured
value in relation to the adjusted alarm thresholds. Please consider that the limit
value ‘A1’ is lower than the limit value ‘A2’. ‘A2’ represents a main alarm state,
where ‘A1’ is normally used as a pre-alarm warning threshold. The LED display
on the front panel informs like a traffic light about the exceeding or falling short
of the limit values. In our example the measured value is above the ‘A1’
threshold and below the main alarm threshold ‘A2’.
5. The last line of the display provides a ‘last value’ display for each measuring
point.
6. On the right side of the first display line the current time is displayed as well as a
status information of the measuring process: ‘M’ for measuring, ‘P’ for purging,
‘W’ for waiting. If option 260 (GSM-Modem) is installed, periodically the
network power is indicated.
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