ULTIMA X
®
Series
GB
51
6 Maintenance
ULTIMA X
®
Series Gas Monitors constantly perform a self check. If a problem is
detected, the appropriate error message is displayed [ chapter 11.3 "Instructions
for troubleshooting"].
When a critical error is detected, the output signal goes to a fault condition.
- For models with 4-20-mA output, the fault output signal is 3.0 mA.
- The "CHANGE SENSOR" message is not an error and does not affect the out-
put signal.
6.1 ULTIMA XIR Cleaning Procedure
Messages that the user may see are shown in 11.1 and 11.2.
Attention!
Use only genuine MSA replacement parts when performing any mainte-
nance procedures provided in this manual. Repair or alteration of the
ULTIMA X
®
Series Gas Monitor, beyond the scope of these instructions
or by anyone other than authorised MSA service personnel may serious-
ly impair instrument performance.
Before cleaning the ULTIMA XIR sensor window disable the alarm re-
lays using the ULTIMA/ULTIMA X Controller. This prevents activation of
the alarm during the cleaning.
Response time will be increased by significant dust deposits on the
XIR SensorGard. Checks for dust deposits have to be done at regular
intervals.