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11.2. PREDICTIVE DIAGNOSTICS
Predictive diagnostic functions including failure warnings and alarms built into the
analyzer’s firmware allow the user to determine when repairs are necessary without
performing painstaking preventative maintenance procedures.
The Test Functions can also be used to predict failures by looking at how their values
change over time. Initially it may be useful to compare the state of these Test Functions
to the values recorded on the printed record of the final calibration performed on your
instrument at the factory, P/N 04314. The following table can be used as a basis for
taking action as these values change with time. The internal data acquisition system
(DAS) is a convenient way to record and track these changes. Use APICOM to
download and review this data from a remote location.
Table 11-2: Predictive Uses for Test Functions
FUNCTION MODE BEHAVIOR INTERPRETATION
STABIL ZERO CAL
Increasing
Pneumatic leaks – instrument & sample
system
Malfunctioning UV lamp (Bench)
O3 REF SAMPLE
Decreasing
UV lamp ageing
Mercury contamination
O3 DRIVE CALS
Increasing
Ageing IZS UV lamp (only if reference
detector option is installed)
Increasing > 1”
Pneumatic Leak between sample inlet and
optical bench
PRES SAMPLE
Decreasing > 1”
Dirty particulate filter
Pneumatic obstruction between sample inlet
and optical bench
Obstruction in sampling manifold
SAMP FL SAMPLE
Decreasing
Pump diaphragm deteriorating
Sample flow orifice plugged/obstructed
Pneumatic obstruction between sample inlet
and optical bench
Obstruction in sampling manifold
Increasing
Pneumatics becoming contaminated/dirty
Dirty particulate filter
Pneumatic leaks – instrument & sample
system
SLOPE SPAN CAL
Decreasing
Contaminated calibration gas
Increasing
Obstructed/leaking Meas/Ref Valve
Pneumatic leaks – instrument & sample
system
OFFSET ZERO CAL
Decreasing
Contaminated zero calibration gas
Obstructed Meas/Ref Valve
Pneumatic leaks – instrument & sample
system
06870C DCN6332