Teledyne T100 Manual Do Utilizador

213 

Calibration gases 

NIST traceable 

Assayed against an NIST-
SRM semi-annually, Sec. 
2.0.7, (Q.A. Handbook) 

Working gas standard is 
unstable, and/or 
measurement method is out 
of control; take corrective 
action such as obtaining new 
calibration gas. 

Dilution gas 

Zero air, free of 
contaminants 

Refer to Section 2.9.2 (Q.A. 
Manual) 

Return to supplier or take 
appropriate action with 
generation system 

Multi-point calibration 

Use calibration 
procedure in Subsec. 2.2 
(Q.A. Handbook); also 
Federal Register 
 

Perform at least once every 
quarter or anytime a level 
span check indicates a 
discrepancy, or after 
maintenance which may 
affect the calibration; Subsec 
2.5 (Q.A. Manual) 

Repeat the calibration 

Either a strip chart recorder, data acquisition system, digital data acquisition system 
should be used to record the data from the Mode; T100 RS-232 port or analog outputs. If 
analog readings are being used, the response of that system should be checked against a 
NIST referenced voltage source or meter. Data recording device should be capable of bi-
polar operation so that negative readings can be recorded. 

To assure data of desired quality, two considerations are essential: (1) the measurement 
process must be in statistical control at the time of the measurement and (2) the 
systematic errors, when combined with the random variation in the measurement 
process, must result in a suitably small uncertainty. 

Evidence of good quality data includes documentation of the quality control checks and 
the independent audits of the measurement process by recording data on specific forms 
or on a quality control chart and by using materials, instruments, and measurement 
procedures that can be traced to appropriate standards of reference. To establish 
traceability, data must be obtained routinely by repeat measurements of standard 
reference samples (primary, secondary, and/or working standards). More specifically, 
working calibration standards must be traceable to standards of higher accuracy, such as 
those listed in Table 9-1. 

Cylinders of working gas traceable to NIST-SRM's (called EPA Protocol Calibration 
Gas) are also commercially available (from sources such as Scott Specialty Gases, etc.). 

Teledyne API does not recommend the use of permeation tubes as a source of span gas 
for EPA protocol calibration operations.  

06807C DCN6650