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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
5.2.2 CAL, CALS, CALZ, Calibration Functions
The calibration and zero/span checking of the M100AH analyzer is treated in detail in Section 8.
Table 8-1 summarizes types of calibration.
5.2.2.1 CAL, CALS, CALZ
The CAL, CALS, and CALZ keys control the calibration functions of the analyzer. In the CAL
mode the analyzer can be calibrated with zero/span gas coming in through the sample filter
assembly on the rear panel. If the instrument will be used on more than one range such as AUTO
RANGE or DUAL RANGE, it should be calibrated separately on each applicable range (see
Section 5.3.4 and 8.1 for calibration procedure).
If the analyzer is equipped with the optional Zero/Span valves, there will also be CALZ and
CALS buttons. The setup of this option is covered in Section 6.3, and operation is explained in
Section 8.2.
5.2.2.2 Zero
Pressing the ZERO key along with ENTR will cause the instrument to adjust the OFFSET value
of the internal formula so that the instrument reads zero. The M100AH allows zero adjustment
over a limited range of signal levels mostly due to the background signal, therefore the signal
does not have to be exactly zero for the instrument to do a zero cal. The instrument will not,
however, allow a zero cal on any signal level, therefore it is not possible to zero the instrument
with span gas in the reaction cell. If the ZERO key does not come on as expected, check
Section 10.2.9.
5.2.2.3 Span
Pressing the SPAN key along with ENTR will cause the instrument to adjust the SLOPE value of
the internal formula so the instrument displays the span value. The expected SO
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span
concentration must be entered before doing a SPAN calibration. See Table 8-3.
Like the Zero calibration, the Span cal cannot be done with any concentration of span gas. If the
signal level is outside certain limits, the SPAN key will not be illuminated. If you encounter this
condition see Section 10.2.8. It is also possible at low levels of span concentration that both the
ZERO and SPAN keys might be on, thus allowing you to either zero or span the instrument. In
this case, care must be taken to perform the correct operation or the analyzer can become mis-
calibrated.
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