Teledyne t320u Manuale Utente

Getting Started 

Teledyne API – Model T300/T300M CO Analyzer 

80 

3.4.4.1. INTERFERENTS FOR CO MEASUREMENTS  

It should be noted that the gas filter correlation method for detecting CO is subject to 
interference from a number of other gases that absorb IR in a similar fashion to CO.  
Most notable of these are water vapor, CO

2

, N

2

O (nitrous oxide) and CH

4

 (methane).  

The T300/T300M has been successfully tested for its ability to reject interference from 
of these sources, however high concentrations of these gases can interfere with the 
instrument’s ability to make low-level CO measurements.   

For a more detailed discussion of this topic, see Section 13.2.1.3. 

3.4.4.2. INITIAL CALIBRATION PROCEDURE  

The following procedure assumes that:  

  The instrument DOES NOT have any of the available calibration valve or gas inlet 

options installed; 

  Cal gas will be supplied through the SAMPLE gas inlet on the back of the analyzer 

(see Figure 3-4) 

  The pneumatic setup matches that described in Section 3.3.2.1. 

While it is possible to perform the following procedure with any range setting we 
recommend that you perform this initial checkout using following reporting range 
settings: 

  Unit of Measure: PPM 
  Analog Output Reporting Range: 50 ppm  
  Mode Setting: SNGL 

06864B DCN6314