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Calibration Procedures Teledyne API – T101 Operation Manual
174
6.6. MANUAL CALIBRATION CHECKS WITH IZS OR
ZERO/SPAN VALVES
Zero and span checks using the zero/span valve or IZS option are similar to that described
in Section 6.3, except:
On units with an IZS option installed, zero air and s
pan gas are supplied to the analyzer
through the zero gas inlet and from ambient air.
On units with a zero/span valve option installed, zero air and span gas are supplied to the
analyzer through the zero gas and span gas inlets from two different sources.
The zero and calibration operations are initiated directly and independently with
dedicated buttons CALZ and CALS.
To perform a manual calibration check of an analyzer with a zero/span valve or IZS
Option installed, use the following method:
NOTE
The instrument can only be fitted with one type of permeation tube at a time. Therefore the IZS option can
only be used to calibrate or check the instrument for one gas, H
2
S or SO
2
, but not both. (SO
2
permeation
tubes differ from H
2
S tubes and can be purchased directly from a manufacturer).
07266B DCN6485