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MAINTENANCE SCHEDULE & PROCEDURES
Model 300E Carbon Monoxide Analyzer
Instruction Manual
148
P/N 04288 Rev: A
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.
Table 9-3: Predictive uses for Test Functions
Function Condition Behavior
Interpretation
Stability
Zero Cal
Increasing
§
Pneumatic Leaks – instrument & sample
system
§
Detector deteriorating
CO MEAS
Zero Cal
Decreasing
§
Source Aging
§
Detector deteriorating
§
Optics getting dirty or contaminated
Increasing
§
Source Aging
§
Detector deteriorating
§
Contaminated zero gas (H2O, CO2)
Zero Cal
Decreasing
§
Source Aging
§
Detector deteriorating
§
GFC Wheel Leaking
§
Pneumatic Leaks
§
Contaminated zero gas (CO)
Increasing
§
Source Aging
§
Pneumatic Leaks – instrument & sample
system
§
Calibration system deteriorating
MR Ratio
Span Cal
Decreasing
§
Source Aging
§
GFC Wheel Leaking
§
Calibration system deteriorating
Increasing > 1”
§
Pneumatic Leak between sample inlet and
Sample Cell
§
Change in sampling manifold
Pres
Sample
Decreasing > 1”
§
Dirty particulate filter
§
Pneumatic obstruction between sample inlet
and Sample Cell
§
Obstruction in sampling manifold
PHT Drive
Any, but with
Bench Temp at
48°C
Increasing
§
Mechanical Connection between IR-Detector
and Sample Cell deteriorating
§
IR-Photodetector deteriorating
Increasing
§
See MR Ratio - Zero Cal Decreasing above
Offset
Zero Cal
Decreasing
§
See MR Ratio - Zero Cal Increasing above
Increasing
§
See MR Ratio - Span Cal Decreasing above
Slope
Span Cal
Decreasing
§
See MR Ratio – Span Cal Increasing above
Содержание 300E
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