Teledyne t320u Manuale Utente

 

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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. 

  

Zero Cal 

Increasing 

  Pneumatic Leaks – instrument & sample system 
 Detector deteriorating 

Zero Cal 

Decreasing 

 Source Aging 
 Detector deteriorating 
  Optics getting dirty or contaminated 

Increasing 

 Source Aging 
 Detector deteriorating 
  Contaminated zero gas (H

2

O) 

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 
  GFC Wheel Leaking 

Span Cal 

Decreasing 

 Source Aging 
  Calibration system deteriorating 

Increasing > 1” 

  Pneumatic Leak between sample inlet and Sample Cell
  Change in sampling manifold 

Sample 

Decreasing > 1” 

  Dirty particulate filter 
  Pneumatic obstruction between sample inlet and 

Sample Cell 

  Obstruction in sampling manifold 

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 

Zero Cal 

Decreasing 

  See MR Ratio - Zero Cal Increasing above 

Increasing 

  See MR Ratio - Span Cal Decreasing above 

Span Cal 

Decreasing 

  See MR Ratio – Span Cal Increasing above 

 

06864B DCN6314