Predicting Failures Using The Test Functions; Table 9-3: Predictive Uses For Test Functions - Teledyne 300E Instruction Manual

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9.2. Predicting Failures Using the Test Functions

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 9-3 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.
Function Condition
Stability Zero Cal
CO MEAS Zero Cal
Zero Cal
MR Ratio
Span Cal
Pres
Any, but with
PHT Drive Bench Temp at
Offset Zero Cal
Slope Span Cal
148

Table 9-3: Predictive uses for Test Functions

Behavior
Increasing
Decreasing
Increasing
Decreasing
Increasing
Decreasing
Increasing > 1"
Sample
Decreasing > 1"
Increasing
48°C
Increasing
Decreasing
Increasing
Decreasing
Model 300E Carbon Monoxide Analyzer
Interpretation
Pneumatic Leaks – instrument & sample
§
system
Detector deteriorating
§
Source Aging
§
Detector deteriorating
§
Optics getting dirty or contaminated
§
Source Aging
§
Detector deteriorating
§
Contaminated zero gas (H2O, CO2)
§
Source Aging
§
Detector deteriorating
§
GFC Wheel Leaking
§
Pneumatic Leaks
§
Contaminated zero gas (CO)
§
Source Aging
§
Pneumatic Leaks – instrument & sample
§
system
Calibration system deteriorating
§
Source Aging
§
GFC Wheel Leaking
§
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
§
Instruction Manual
P/N 04288 Rev: A