Chapter 4
Maintenance
General
The Ultima X Gas Monitor is constantly performing a self-check.
When a problem is found, it displays the appropriate error
message. (Table 4-3, "Troubleshooting Guidelines"). When a
critical error is detected within the unit, the output signal goes to
a fault condition.
• For 4 to 20 milliamp output models: output is 3.0 mA
• The "Change Sensor" indication is not an error and does not
affect the output.
NOTE: TABLES 4-1 and 4-2 describe the messages that
users may see.
Ultima XIR Cleaning Procedure
The presence of particulate matter, oil films, liquid water, or the
residue from water drops on the two monitor windows can
adversely affect its performance. The environmental guard is
designed to prevent foreign solids or liquids from reaching the
monitor’s optical system. Additionally, heating elements are
incorporated into the unit to prevent water condensation. Under
severe conditions, however, some material may collect on these
surfaces and it may be necessary to occasionally check and
clean the windows.
The windows can be readily inspected after removing the
environmental guard. While both windows are made of a highly
durable material that is not easily scratched, avoid excessive
pressure when cleaning them. Clean, cotton-tipped applicators
are the most convenient tool to remove material collected on the
windows. Dust can be removed by wiping the window with a dry
applicator or one moistened with distilled water. An additional
clean, dry applicator should be used to remove any residual
water. An applicator moistened with isopropyl alcohol can be
used to remove heavy deposits of solids, liquids or oil films.
Clean the window again with a second applicator moistened with
distilled water; then, dry the window with a final applicator. Avoid
using excessive amounts of water or alcohol in the cleaning
procedure, and inspect the window to ensure that the entire
surface has been cleaned. If water or isopropyl alcohol was
used, allow the unit to operate for 15 minutes to completely dry
before replacing the environmental guard and continuing to
monitor for combustible gas. After cleaning the windows, it is
Chapter 4, Maintenance
4-1
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