Filter
Top Products
Instruction Manual
IM-106-910Xi, Original Issue
November 2010
Xi Advanced Electronics
http://www.raihome.com
Section 6 Maintenance and Service
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-1
Maintenance Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-1
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-2
Automatic Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-2
Manual Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-2
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-2
Xi Components Replacement . . . . . . . . . . . . . . . . . . . . . . page 6-3
I/O Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-4
AC Relay Board Replacement . . . . . . . . . . . . . . . . . . . . . . page 6-8
Power Supply Board Replacement . . . . . . . . . . . . . . . . . . page 6-11
Xi Front Panel Replacement . . . . . . . . . . . . . . . . . . . . . . . page 6-12
DR Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-14
OVERVIEW
This section identifies the calibration methods available and provides the
procedures to maintain and service the Xi.
MAINTENANCE
INTERVALS
The maintenance interval required is quite variable, depending on the type of
service the analyzer is placed into. The zirconium oxide sensing cell is
non-depleting, and has no specific shelf life or a defined life in flue gas
operation. The cell of a probe that is mounted inside a boiler that is burning
natural gas may shift very little over several years. Acidic compounds are the
main aggressors to the sensing cell, typically SO
2
resulting from sulfur
contained in coal and heavy oil fuels, and also HCl from the combustion of
plastics in municipal incinerators and in industrial thermal oxidizers. Sensing
cells may experience significant degradation and signal shift in this type of
service, particularly if the operating levels of O
2
are very low (below 1% O
2
).
A calibration check is generally recommended on a quarterly basis (every 3
months) by flowing bottled gas to the probe. (Make sure that the operations
personnel are notified when doing this, and also make sure that the O
2
control
loop is placed in manual mode). If the probe readings vary significantly from
the bottle values, then a formal calibration should be conducted as noted in
Section 4: Startup and Operation.
The Xi offers a "calibration recommended" diagnostic that will indicate when
the probe needs to be calibrated.
Install all protective equipment covers and safety ground leads after equipment repair or
service. Failure to install covers and ground leads could result in serious injury or death.