Teledyne 100AH 2 CAL, CALS, CALZ, Calibration Functions, 2.1 CAL, CALS, Calz, Zero, Span

Teledyne API Model 100AH SO2 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 8-1summarizes 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 SO2 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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