ULTIMA X
®
Series
GB
39
In this case, the ULTIMA X Series Gas Monitor switches to one of the following
operating modes:
- In the +LOC % LEL mode, the output signal will also be locked at full-scale. If
this condition occurs the ULTIMA X must be unlocked by performing a
“Zero Function” with the Calibrator or Controller. This prevents ambiguous val-
ues from being displayed when the sensor is exposed to a gas concentration of
more than 100 % LEL.
- In the OVER % LEL mode, the combustible gas exceeds the 100 % LEL range.
The ULTIMA X returns to normal operation, as soon as the gas concentration
drops below 100 % LEL.
5 Calibration
The ULTIMA® X Gas Monitor calibration must be checked at regular intervals [at
least every 6 months] in accordance with EN 60079-29-2 and EN 45544-4 and any
applicable national regulations.
+LOC % LEL: The ULTIMA X
®
Series Gas Monitor has been exposed to a high
gas concentration [above the LEL], and there is a possibility that
the over-range condition may still exist.
OVER % LEL: The ULTIMA X
®
Series Gas Monitor has been exposed to a high
gas concentration [above the LEL], and the over-range condition
definitely still exists.
Attention!
In both cases, rectify the cause of the excessively high gas concentra-
tion and ventilate the area before attempting the following.
Before the actual calibration, completely read all the calibration instruc-
tions and the ATEX performance information in the Technical Data
chapter of this manual.
Identify all calibration components and become familiar with them.
It is recommended that all calibration components are connected before
starting a calibration as it is necessary to apply test gas to the instrument
during a 30 second countdown.
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