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M400E Ozone Analyzer Operator’s Manual Maintenance Schedule & Procedures
12. MAINTENANCE SCHEDULE & PROCEDURES
For the most part, the M400E analyzer is maintenance free, there are, however, a minimal number of simple
procedures that when performed regularly will ensure that the M400E photometer continues to operate
accurately and reliably over its lifetime.
Repairs and troubleshooting are covered in Chapter13 of this manual.
12.1. PREDICTING FAILURES USING THE TEST FUNCTIONS
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 (Idas) is a
convenient way to record and track these changes. Use APICOM to download and review this data from a
remote location.
Table 12-1: 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
04315 Rev. C1 219