Teledyne 6200T - Sulfides Analyzer - Manual (Page 215)

6200T Total Sulfur Analyzer EPA Protocol Calibration
Teledyne Analytical Instruments 215
a NIST referenced voltage source or meter. Data recording device should be capable of
bi-polar operation so that negative readings can be recorded.
10.1.3. Recommended Standards for Establishing Traceability
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.).
10.1.4. EPA Calibration Using Permeation Tubes
Teledyne Analytical Instruments does not recommend the use of permeation tubes as a
source of span gas for EPA protocol calibration operations.
10.1.5. Calibration Frequency
To ensure accurate measurements of the SO
2
concentrations, calibrate the analyzer at the
time of installation, and re-calibrate it:
 No later than three months after the most recent calibration or performance
audit to indicate an acceptable analyzer calibration.
 An interruption of more than a few days in analyzer operation.
 Any repairs which might affect its calibration.
 Physical relocation of the analyzer.
 Any other indication (including excessive zero or span drift) of possible
significant inaccuracy of the analyzer.
Following any of the activities listed above, the zero and span should be checked to
determine if a calibration is necessary. If the analyzer zero and span drifts exceed locally
established calibration units or the calibration limits in Section 2.0.9, Subsection 9.1.3
(Q.A. Handbook), a calibration should be performed.
10.1.6. Record Keeping
Record keeping is a critical part of all quality assurance programs. Standard forms
similar to those that appear in this manual should be developed for individual programs.
Three things to consider in the development of record forms are:
 Does the form serve a necessary function?
 Is the documentation complete?
 Will the forms be filed in such a manner that they can easily be retrieved
when needed?