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Teledyne API – T101 Operation Manual Calibration Procedures
165
6.1.5. 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 acquiring 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 6-1. NIST-SRM's Available for Traceability of H2S and SO2 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
6.1.6. DATA RECORDING DEVICES
A strip chart recorder, data acquisition system or digital data acquisition system should be
used to record data from the T101’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 T101 provides an
internal data acquisition system (DAS ), which is described in detail in Section 4.8.
6.2. MANUAL CALIBRATION
The following section describes the basic method for manually calibrating the Model
T101 analyzer in H
2
S measurement mode. The same method may be used to calibrate the
T101 analyzers configured for SO
2
measurement by substituting SO
2
span gas for the H
2
S
span gas listed. See Section 6.8 for instructions on calibrating analyzers configured for
mu
ltigas measurement mode.
NOTE on Calibration and Calibration Checks
If you wish to perform a calibration CHECK, do not press ENTR - see Section 6.3.
Pressing ENTR 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.
07266B DCN6485