Predicting Failures Using The Test Functions - Teledyne T300 Operation Manual

11.2. PREDICTING FAILURES USING THE TEST FUNCTIONS

Table 11-3: Predictive uses for Test Functions
FUNCTION CONDITION
STABILITY Zero Cal
CO MEAS
Zero Cal
Zero Cal
MR RATIO
Span Cal
PRES Sample
Any, but with
PHT DRIVE
Bench Temp at
OFFSET
Zero Cal
SLOPE
Span Cal
06864B DCN6314
The Test 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 Test Functions to the
values recorded on the printed record of the final calibration performed on your
instrument at the factory, P/N 04307. Table 11-3 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.
BEHAVIOR
Increasing
Decreasing
Increasing
Decreasing
Increasing
Decreasing
Increasing > 1"
Decreasing > 1"
Increasing
48°C
Increasing
Decreasing
Increasing
Decreasing
INTERPRETATION
• Pneumatic Leaks – instrument & sample system
• Detector deteriorating
• Source Aging
• Detector deteriorating
• Optics getting dirty or contaminated
• Source Aging
• Detector deteriorating
• Contaminated zero gas (H
• Source Aging
• Detector deteriorating
• GFC Wheel Leaking
• Pneumatic Leaks
• Contaminated zero gas (CO)
• Source Aging
• Pneumatic Leaks – instrument & sample system
• Calibration system deteriorating
• GFC Wheel Leaking
• Source Aging
• Calibration system deteriorating
• Pneumatic Leak between sample inlet and Sample Cell
• Change in sampling manifold
• Dirty particulate filter
• Pneumatic obstruction between sample inlet and
Sample Cell
• Obstruction in sampling manifold
• Mechanical Connection between IR-Detector and
Sample Cell deteriorating
• IR-Photodetector deteriorating
• See MR Ratio - Zero Cal Decreasing above
• See MR Ratio - Zero Cal Increasing above
• See MR Ratio - Span Cal Decreasing above
• See MR Ratio – Span Cal Increasing above
O)
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