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 concentration of gas (above the LEL) and
the over-range condition definitely still exists.
"
CAUTION
In either mode, correct the condition causing the excessive gas level
and vent or purge the area before attempting the following.
In the +LOC % LEL mode, the output signal will also be
locked at full-scale. If this condition occurs, the
Ultima X Series Gas Monitor must be unlocked by
performing a "Zero Function" with the Ultima X
Series Gas Monitor Calibrator or Controller. The
Ultima X Series Gas Monitor will not revert to a
normal condition until a successful zero operation
has been performed. This is an exclusive safety
feature of the Ultima X Series Gas Monitor which
pre-empts the possibility of ambiguous readings
when the sensor is exposed to concentration of gas
above 100% LEL
In the OVER % LEL mode, the combustible gas is over
the 100% LEL range. It returns to normal operation
when gas concentration level falls below 100% LEL.
Chapter 2, Start-up and Calibration
2-2
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