Teledyne 6200E - Sulfides Analyzer - Manual (Page 167)

Model 6200E Instruction Manual Calibration Procedures
M6200E Rev: A1 167
7.5. Manual Calibration with IZS Option
The following section describes the basic method for manually calibrating the Model 6200E analyzer
in H
2
S measurement mode using the IZS option. The same method may be used to calibrate the
M6200E analyzers configured for SO
2
measurement but requires that an SO
2
permeation tube be
installed in the instrument instead of the standard H
2
S tube.
See Section 7.8 for instructions on calibrating analyzers configured for multigas measurement
mode.
Under the best conditions, the accuracy off the H
2
S effusion rate of the IZS option’s permeation
tube is about ±5%. This can be subject to significant amounts of drift as the tube ages and the
amount of H
2
S contained in the tube is depleted. Whereas this may be sufficient for calibrating
instrument configured for H
2
S measurement and for informal calibration checks of instruments
measuring SO
2
, it is not adequate for formal SO
2
calibrations and is not approved for use by the US
EPA as a calibration source for calibrating SO
2
monitoring equipment.
For applications where more stringent calibration requirements are specified for an instrument with
an IZS option installed the following provisions must be followed.
1. Zero air and span gas must be supplied to the analyzer through the sample gas inlet as
depicted in Figure 7-1 of Section 7.2.
2. The calibration procedure must be initiated using the CAL key, not the CALZ and CALS keys,
using the procedure defined in Section 7.2.
3. Using the CAL key does not activate the zero/span or sample/cal valves of the IZS option, thus
allowing the introduction of zero air and sample gas through the sample port from more
accurate, external sources such as a calibrated bottle of H
2
S and SO
2
or a Model 700 Dilution
Calibrator.
SAMPLE RANGE = 500.0 PPB H2S =XXX.X
< TST TST >
CAL CALZ CALS SETUP
Use for formal
calibration
operations.
Use only for
informal calibration
checks.