Teledyne 100AH instruction manual Step Number Action Comment, Entr

Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D

8.1Manual Zero/Span Check or Calibration Through the Sample Port

The zero and span calibration of the instrument can be checked or adjusted using gases supplied through the normal sample port. This method is often used when the calibration gas is supplied from an external calibrator system.

This mode provides a calibration mechanism if the instrument is purchased without the Zero/Span Valve option.

Since the zero gas concentration is defined as 0 PPM, it is not necessary to enter the expected zero value. Table 8-2details the zero calibrate procedure with zero gas coming in through the sample port.

Table 8-2: Manual Zero Calibration Procedure - Zero Gas Through Sample Port

Step Number	Action	Comment
1.	Press CAL	The M100AH enters the calibrate mode from sample mode.
		The zero gas must come in through the sample port. If
		AutoRange is enabled, then select LO or HI range and press
		ENTR.
2.	Wait 10 min	Wait for reading to stabilize at zero value
3.	Press ZERO	If you change your mind after pressing ZERO, you can still
		press EXIT here without zeroing the instrument.
4.	Press ENTR	Pressing ENTR actually changes the calculation equations.
5.	Press EXIT	M100AH returns to sampling. Immediately after calibration,
		data is not added to the DAS averages.

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 8.6 for calibration procedure).

8-3