MaintenanceTeledyne API – Model T300/T300M CO Analyzer

Teledyne Analytical Instruments
11.2. 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 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.

Table 11-3: 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 contaminate d
MR RATIO
Zero Cal
Increasing
Source Aging
Detector deteriorating
Contaminated zero gas (H2O)
Decreasing
Source Aging
Detector deteriorating
GFC Wheel Leakin g
Pneumatic Leaks
Contaminated zero gas (CO)
Span Cal
Increasing
Source Aging
Pneumatic Leaks – instrument & sample system
Calibration s ystem deteriorating
GFC Wheel Leakin g
Decreasing Source Aging
Calibration s ystem deteriorating
PRES Sample
Increasing > 1” Pneumatic Lea k between sample inlet and Sample Cell
Change in sam pling manifold
Decreasing > 1”
Dirty particulate filter
Pneumatic obstruction bet ween sample inlet and
Sample Cell
Obstruction in sampling manif old
PHT DRIVE
Any, but with
Bench Temp at
48°C
Increasing
Mechanical Connecti on between IR-Detector and
Sample Cell deteriorating
IR-Photodetector deteriorating
OFFSET Zero Cal
Increasing See MR Ratio - Zero Cal Decreasing above
Decreasing See MR Ratio - Zero Cal Increasing above
SLOPE Span Cal
Increasing See MR Ratio - Span Cal Decreasing above
Decreasing See MR Ratio – Span Cal Increasing above