Teledyne 6200T - Sulfides Analyzer - Manual (Page 189)

6200T Total Sulfur Analyzer Calibration Procedures
Teledyne Analytical Instruments 189
9.1.1.3. Calibration Gas Standards and 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 9-1: NIST-SRM's Available for Traceability of SO
2
Calibration Gases
NIST-SRM 4 TYPE
NOMINAL
CONCENTRATION
1693a
1694a
1661a Sulfur dioxide in N
2
Sulfur dioxide in N
2
Sulfur dioxide in N
2
50 ppm
100 ppm
500 ppm
9.1.2. Data Recording Devices
A strip chart recorder, data acquisition system or digital data acquisition system should
be used to record data from the 6200T’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 6200T
provides an internal data acquisition system (DAS), which is described in detail in
Section 6.6.
I MPORTANT I MPACT ON R EADINGS OR D ATA
Be aware of the difference between Calibration and Calibration Check:
Pressing the ENTR button during the following procedure re-calculates
the stored values for OFFSET and SLOPE and alters the instrument’s
calibration. If you wish to perform a calibration CHECK, do not press
ENTR and refer to Section 9.3.
9.2. Manual Calibration
The following section describes the basic method for manually calibrating the 6200T
SO
2
analyzer.
STEP ONE: Connect the sources of zero air and span gas as shown below.