Figure 4-2. Sensor Assembly And Sensor Guard For General-Purpose Model - MSA Ultima X Series Installation & Maintenance Instructions Manual

For the Ultima XE Sensor marked Class II Groups F and G,
atmosphere must be free of dust and the power removed
from the unit before the sensor cap can be removed from the
housing. Failure to follow this warning can result in the igni-
tion of a hazardous atmosphere.
Figure 4-2. Sensor Assembly and Sensor Guard
for General-Purpose Model
2. Identify the sensor assembly needed via the A-ULTX-SENS code
on the interior sensor label and obtain the appropriate sensor
assembly; replace sensor assembly.
NOTE: Alarm setpoints and relay functions (energized/de-
energized, latching/unlatching, and upscale/downscale) will
not change when changing a sensor module from its
current gas type to the same gas type (e.g., carbon
monoxide to carbon monoxide). Alarm setpoints and the
upscale/downscale relay function will change to the new
sensor's default settings when changing a sensor module
from its current gas type to a different gas type (e.g.,
carbon monoxide to oxygen).
3. The Ultima X Series Gas Monitor is shipped with the Sensor Swap
Delay enabled. This means that the 4-20 mA output signal and the
FAULT relay will hold off a fault indication for 60 seconds after the
sensor missing indication is displayed on the instrument. This
setting allows the operator to exchange sensor modules without a
FAULT indication.
4. Refer to Chapter 2, "Calibration" to calibrate with the new sensor.
It is recommended that all other maintenance be performed at an MSA
factory-authorized service center.
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