Teledyne 6200E - Sulfides Analyzer - Manual (Page 179)

Model 6200E Instruction Manual EPA Protocol Calibration
M6200E Rev: A1 179
8. EPA PROTOCOL CALIBRATION
8.1. Calibration Requirements
When configured for SO
2
measurement mode or multigas measurement mode, the M6200E may be
used for EPA SLAMS monitoring. In these cases it must be calibrated in accordance with the
instructions in this section.
At the writing of this manual there is no EPA requirements for the monitoring of H
2
S or published
H
2
S calibration protocols, therefore these instruction only discuss the calibration of the SO
2
measurement feature.
In order to insure that high quality, accurate measurements are obtained at all times, the M6200E
must be calibrated prior to use. A quality assurance program centered on this aspect and including
attention to the built-in warning features of the M6200E, periodic inspection, regular zero/span
checks and routine maintenance is paramount to achieving this.
In order to have a better understanding of the factors involved in assuring continuous and reliable
information from the M6200E, it is strongly recommended that Publication No. PB 273-518 Quality
Assurance Handbook for Air Pollution Measurement Systems (abbreviated, Q.A. Handbook) be
purchased from the NTIS (phone 703-605-6000). Special attention should be paid to Section 2.9
which deals with fluorescence based SO
2
analyzers and upon which most of this section is based.
Specific regulations regarding the use and operation of ambient hydrogen sulfide analyzers can be
found in 40 CFR 50 and 40 CFR 58. Both publications are available from the U.S. Government
Printing Office (phone 202-512-0327).
8.1.1. Calibration of Equipment
In general, calibration is the process of adjusting the gain and offset of the M6200E against some
recognized standard. The reliability and usefulness of all data derived from any analyzer depends
primarily upon its state of calibration. In this section the term dynamic calibration is used to
express a multipoint check against known standards and involves introducing gas samples of
known concentration into the instrument in order to adjust the instrument to a predetermined
sensitivity and to produce a calibration relationship. This relationship is derived from the
instrumental response to successive samples of different known concentrations. As a minimum,
three reference points and a zero point are recommended to define this relationship. The true
values of the calibration gas must be traceable to NIST-SRM's See Table 7.1.
All monitoring instrument systems are subject to some drift and variation in internal parameters
and cannot be expected to maintain accurate calibration over long periods of time. Therefore, it is
necessary to dynamically check the calibration relationship on a predetermined schedule. Zero and
span checks must be used to document that the data remains within control limits. These checks
are also used in data reduction and validation. Table 8-3 summarizes the initial quality assurance
activities for calibrating equipment. Table 8-2 is a matrix for the actual dynamic calibration
procedure.
Calibrations should be carried out at the field monitoring site. The Analyzer should be in operation
for at least several hours (preferably overnight) before calibration so that it is fully warmed up and
its operation has stabilized. During the calibration, the M6200E should be in the CAL mode, and
therefore sample the test atmosphere through all components used during normal ambient