Teledyne T101 - page 167

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 Ref erence Materials (SRM). These are av ailable from a variety of commercial

sources.

Table 6-1. NIST-SRM's Available for Traceability of H2S and SO2 Calibration Gases

NIST-SRM4 TYPE NOMINAL

CONCENTRATION

2730

2731

Hydrogen sulfide in N2

5000 ppb

20 ppm

1693a

1694a

1661a

Sulfur dioxide in N2

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 H2S measurement mode. The same method may be used to calibrate the

T101 analyzers configured for SO2 measurement by substituting SO2 span gas for the H2S

span gas listed. See Section 6.8 for instructions on calibrating analyzers configured for

multigas 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 OFFS1 and H2S

SLOPE1 (instrument response curve) and alters the instrument’s calibration.

07266B DCN6485