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100
Teledyne API – Model T400 O
3
Analyzer
083730400A DCN8130
5.2 PREDICTING DIAGNOSTICS
These Functions can 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 functions to the values
recorded on the printed record of the Final Test and Validation Data Sheet for your
instrument. Table 5-2 can be used as a basis for taking action as these values change with
time. The Data Logger (internal data acquisition system or DAS) is a convenient way to
record and track these changes (Section 2.5.1). Use NumaView™ Remote to download
and review this data from a remote location.
Table 5-2. Predictive Uses for Dashboard Functions
FUNCTION CONDITION
BEHAVIOR
INTERPRETATION
STABILITY
Zero Cal
Increasing
•
Pneumatic leaks – instrument & sample system
•
Malfunctioning UV lamp (Bench)
O3 REF
Sample
Decreasing
•
Lamp Aging
•
Mercury contamination
O3 DRIVE
CalS
Increasing
•
Aging IZS UV lamp (only if reference detector
option is installed)
PRESSURE
Sample
Increasing > 1”
•
Pneumatic Leak between sample inlet and optical
bench
Decreasing > 1”
•
Dirty particulate filter
•
Pneumatic obstruction between sample inlet and
optical bench
•
Obstruction in sampling manifold
SAMPLE
FLOW
Sample
Decreasing
•
Pump diaphragm deteriorating
•
Sample flow orifice plugged/obstructed
•
Pneumatic obstruction between sample inlet and
optical bench
•
Obstruction in sampling manifold
OFFSET
Zero Cal
Increasing
•
Obstructed/leaking Meas/Ref Valve
•
Pneumatic leaks – instrument & sample system
Decreasing
•
Contaminated zero calibration gas
•
Obstructed Meas/Ref Valve
•
Pneumatic leaks – instrument & sample system
SLOPE
Span Cal
Increasing
•
Pneumatics becoming contaminated/dirty
•
Dirty particulate filter
•
Pneumatic leaks – instrument & sample system
Decreasing
•
Contaminated calibration gas
Содержание T400
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