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6
Overrange
When the gas sample exceeds 1999 ppm, a “1” is
displayed on the LCD. To clear an overrange con-
dition, leave the instrument turned on and sample
fresh air until the LCD returns to displaying SO
2
.
Low Battery Indications
When the battery voltage becomes low, the “LO
BAT” indicator appears. Although the instrument
will continue to operate and give SO
2
readings
under these conditions, the batteries should be replaced as soon as
possible.
When the battery voltage becomes too low for the
instrument to operate, a “-1” is displayed on the
LCD. No SO
2
readings are provided under these
conditions.
4.7 Long-Term Storage
When storing the Dioxor II for extended periods of time, set its
POWER switch to OFF and remove the batteries. The POWER OFF
position places a short across the SO
2
sensor, thus keeping it from being
destabilized while not in use.
5 MAINTENANCE
The Dioxor II needs to be calibrated at regular intervals to ascertain
that it still meets its accuracy specification. A regular calibration
schedule should be established between you and your nearest Bachar-
ach Service Center, unless your facility has the necessary calibration
equipment and personnel trained in the maintenance of gas-detection
equipment. Detailed calibration procedures are provided upon request
from the factory. Detailed maintenance procedures and parts lists are
provided in the Service Manual (19-9166).