Internal Zero/Span (Izs); Autocal - Setup Of Izs And Zero/Span Valves - Teledyne 6400A Instruction Manual

Sulfur dioxide analyzer

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TAI Model 6400A SO

6.3 Internal Zero/Span (IZS)

The IZS option includes the Zero/Span Valves described above, a temperature-controlled

permeation tube oven, and rear panel mounted zero air scrubber. The IZS system is activated by

the same methods as described in Table 6-1 for the zero/span valves. The setup of the IZS is the

same as that of the valves and is described in Table 6-2.

The IZS system operation is similar to the zero/span valve operation, except that the source of

the zero air and span gas are supplied at the analyzer via a scrubber and permeation tube

respectively. See Section 7.1 - calibration for operational details. A continuous purge flow of

approximately 50cc/min is drawn across the permeation tube to prevent span gas accumulation

when the permeation tube is not in use.

The Zero/Span valves or the IZS system can be set up to operate automatically on a timed basis.

The TAI model 6400A with IZS option offers capability to check any combination of zero and

span points automatically on a timed basis, through remote RS-232 operation (see Section 6.8.5),

or external contact closure (see Section 7.7).

There are three auto-calibration sequences called SEQ1, SEQ2, and SEQ3. 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.

1) Calibration Sequence Mode

Each sequence can generate any one of 3 different combinations of ZERO, or HI span point. Press

SETUP-ACAL, and scroll up or down to select of the SEQx. Press MODE and scroll up or down by

pressing PREV or NEXT. Select one of the combination shown below and press ENTR .

Combinations:

2) Setup Calibration Timer:

Press SETUP-ACAL-SET to setup or edit the automatic calibration timer.

Following table summarizes the setup procedures;

Analyzer Operator Manual, 02164, Rev. G

1) DISABLED; will disable corresponding SEQx setup.

2) ZERO

3) ZERO-HI

4) HI

6-3

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