Teledyne 100AH instruction manual Autocal Setup Zero/Span Valves

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

Zero/Span valves have 4 operational states:

1.Sample mode. All four valves are not energized and sample gas passes through the sample valve and into the analyzer for analysis. For any other mode, sample valve is energized to shut off sample port. Refer to Figure 9-3Pneumatic Diagram.

2.Zero mode. The zero valve is energized allowing zero gas to be admitted into the analyzer through the rear panel bulkhead fitting.

3.Low Span mode. The low span valve is energized and low span gas is admitted into the analyzer through a rear panel bulkhead fitting.

4.High Span mode. The high span valve is energized and high span gas is admitted into the analyzer through a rear panel bulkhead fitting.

Zero air and span gas inlets should supply their respective gases in excess of the 700 cc/min (i.e. 1000 cc/min) demand of the analyzer at ambient pressure. Ideally the calibration gas pressure should be the same one as the sample gas pressure and should not differ more than 2 in-Hg. Supply and vent lines should be of sufficient length and diameter to prevent back diffusion and pressure effects. See Figure 2-3for fitting location and tubing recommendations.

Adequate inexpensive zero air can be supplied from the room air by connecting a charcoal scrubber and 5 micron particulate filter (Teledyne API P/N 000369) to the zero air inlet tubing. The zero air scrubber used in conjunction with the Zero/Span Valve option provides an inexpensive source of zero air.

6.3 Autocal - Setup Zero/Span Valves

The Zero/Span valves system can be set up to operate automatically on a timed basis. The Teledyne API model 100AH with Zero/Span valves option offers capability to check any combination of zero and up to two span points either automatically on a timed basis, through remote RS-232 operation (see Section 7.5), or external contact closure (see Section 8.5).

There are three auto-calibration sequences called SEQ1, SEQ2, and SEQ3. Each SEQ can be programmed to perform a specific calibration sequence. Under each SEQ, there are five parameters that affect zero/span checking: the mode enable/selection, the starting date and time of the calibration, the number of delay days and time, duration of calibration, and calibration adjust enable/disable.

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