Teledyne T100 Manuale Utente

67 

Calibration gas is a gas specifically mixed to match the chemical composition of the 
type of gas being measured at near full scale of the desired measurement range. In this 
case, SO

2

 measurements made with the Teledyne API T100 UV Fluorescence SO

2

 

Analyzer, it is recommended that you use a span gas with a SO

2

 concentration equal to 

80% of the measurement range for your application. 

EXAMPLE: If the application is to measure between 0 ppm and 500 ppb, an appropriate 
span gas concentration would be 450 ppb SO

2

.  

Cylinders of calibrated SO

2

 gas traceable to NIST-Standard Reference Material 

specifications (also referred to as SRM’s or EPA protocol calibration gases) are 
commercially available. Table 3-12 lists specific NIST-SRM reference numbers for 
various concentrations of SO

2

. 

1693a 

Sulfur dioxide in N

2

 50 

ppm 

1694a 

Sulfur dioxide in N

2

 100 

pp 

1661a 

Sulfur dioxide in N

2

 500 

ppm 

2659a

1

 

O

2

 in N

2

 21% 

by 

weight 

2626a CO

2

 in N

2

 4% 

by 

weight 

2745

2

 CO

2

 in N

2

 16% 

by 

weight 

1

 Used to calibrate optional O

2

 sensor. 

2

 Used to calibrate optional CO

2

 sensor. 

Some applications, such as EPA monitoring, require a multipoint calibration procedure 
where span gases of different concentrations are needed. We recommend using a bottle 
of calibrated SO

2

 gas of higher concentration in conjunction with a gas dilution 

calibrator such as a Teledyne API Model T700 (Figure 3-17) This type of calibrator 
precisely mixes a high concentration gas with zero air (both supplied externally) to 
accurately produce span gas of the correct concentration. Linearity profiles can be 
automated with this model and run unattended over night. 

If you are unfamiliar with the T100 principles of operation, we recommend that you 
read Section 13.  For information on navigating the analyzer’s software menus, refer to 
the menu trees provided in Appendix A. 

 

06807C DCN6650