Teledyne 6200E - Sulfides Analyzer - Manual (Page 159)

Model 6200E Instruction Manual Calibration Procedures
M6200E Rev: A1 159
7.1.5. Calibration Gas Traceability
All equipment used to produce calibration gases should be verified against standards of the
National Institute for Standards and Technology (NIST). To ensure NIST traceability, we
recommend to acquire cylinders of working gas that are certified to be traceable to NIST Standard
Reference Materials (SRM). These are available from a variety of commercial sources.
Table 7-1: NIST-SRM's Available for Traceability of H
2
S and SO
2
Calibration Gases
NIST-SRM 4 TYPE NOMINAL
CONCENTRATION
2730
2731 Hydrogen sulfide in N
2
Hydrogen sulfide in N
2
5000 ppb
20 ppm
1693a
1694a
1661a Sulfur dioxide in N
2
Sulfur dioxide in N
2
Sulfur dioxide in N
2
50 ppm
100 ppm
500 ppm
7.1.6. Data Recording Devices
A strip chart recorder, data acquisition system or digital data acquisition system should be used to
record data from the M6200E’s serial or analog outputs. If analog readings are used, the response
of the recording system should be checked against a NIST traceable voltage source or meter. Data
recording device should be capable of bi-polar operation so that negative readings can be recorded.
For electronic data recording, the M6200E provides an internal data acquisition system (iDAS),
which is described in detail in Section 6.11.
7.2. Manual Calibration
The following section describes the basic method for manually calibrating the Model 6200E analyzer
in H
2
S measurement mode. The same method may be used to calibrate the M6200E analyzers
configured for SO
2
measurement by substituting SO
2
span gas for the H
2
S span gas listed. See
Section 7.8 for instructions on calibrating analyzers configured for multigas measurement mode.
NOTE on Calibration and Calibration Checks
Pressing the ENTR key during the following procedure re-calculates the stored values for
H2S OFFS 1 and H2S SLOPE 1 (instrument response curve) and alters the instrument’s
calibration.
If you wish to perform a calibration CHECK, do not press ENTR and see Section 7.3.