Teledyne 6200A - Sulfides analyzer - Manual (Page 83)

TAI Model 6200A SO
2
Analyzer Operator Manual, 02164, Rev. G
Table 6-1: Zero/Span Valve Operation
Mode Description Reference Section
1. Front panel operation via CALS and
CALZ buttons. Calibration Section 7 - Manual Zero/Span
Check.
2. Automatic operation using AUTOCAL Setup and use of AUTOCAL is described in
and Section 7.4.
3. Remote operation using the RS-232
interface Setup described in Table 6-2 Operation of
AUTOCAL described in Section 6.8.5 and
Section 7 - Calibration.
4. Remote operation using external contact
closures Section 7.7 - Automatic operation using
external contact closures. Truth Table 7-8
and Section 9.3.4.3.
Zero/Span valves have 3 operational states:
1. Sample mode. Here both valves are un-energized and sample gas passes through the
sample/cal valve and into the analyzer for analysis.
2. Zero mode. The sample/cal valve is energized to the cal mode. The zero/span valve is un-
energized in the zero mode, thus allowing zero gas to be admitted through the rear panel
bulkhead fitting into the analyzer.
3. Span mode. The sample/cal valve is energized and in the cal mode. The zero/span valve is
energized in the span mode. With both valves on, span gas is admitted through a rear panel
bulkhead fitting into the analyzer.
Zero air and span gas inlets should supply their respective gases in excess of the 700 cc/min
demand of the analyzer. Supply and vent lines should be of sufficient length and diameter to
prevent back diffusion and pressure effects. See Figure 2-3 for fitting location and tubing
recommendations.
Adequate zero air can be supplied by connecting a charcoal scrubber and 5 micron particulate
filter (TAI 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.
6-2