Teledyne 6200E - Sulfides Analyzer - Manual (Page 48)

Optional Hardware and Software Model 6200E Instruction Manual
48 M6200E Rev: A1
The following table describes the state of each valve during the analyzer’s various operational
modes.
Table 5-1: Zero/Span Valve Operating States
MODE VALVE CONDITION VALVE PORT
CONNECTION
(FIG. 5-2)
Sample/Cal Open to SAMPLE inlet 3 Æ 2
SAMPLE
Zero/Span Open to ZERO AIR inlet 3 Æ 2
Sample/Cal Open to zero/span inlet 1 Æ 2
ZERO CAL
Zero/Span Open to ZERO AIR inlet 3 Æ 2
Sample/Cal Open to zero/span inlet 1 Æ 2
SPAN CAL
Zero/Span Open to SPAN GAS inlet 1 Æ 2
The state of the zero/span valves can also be controlled:
• Manually from the analyzer’s front panel by using the SIGNAL I/O controls located under
the DIAG Menu (Section 6.9.2),
• By activating the instrument’s AutoCal feature (Section 7.9 ),
• Remotely by using the external digital control inputs (Section 6.12.1.2 and Section 7.7.1),
or
• Remotely through the RS-232/485 serial I/O ports (see Appendix A-6 for the appropriate
commands).
Sources of zero and span gas flow must be capable of supplying at least 600 cm 3 /min. Both supply
lines should be vented outside of the analyzer’s enclosure. In order to prevent back-diffusion and
pressure effects, these vent lines should be between 2 and 10 meters in length.
5.4.2. Internal Zero/Span Gas Generator (Option 51)
The M6200E can be equipped with an internal zero air and span gas generator (IZS). This option
includes a heated enclosure for a permeation tube containing the calibration gas under high
pressure, an external scrubber for producing zero air and a set of valves for switching between the
sample gas inlet and the output of the zero/span subsystem, functionally very similar to the valves
included in the zero/span valve option.
Figure 5-3 shows the internal pneumatic connections for a Model 6200E with the IZS option
installed. The following table contains the operational state of the valves associated with the IZS
option during the analyzer’s various operational modes.
Because the M6200E can be configured to measure H
2
S, SO
2
or both. This option is available with
permeation tubes filled with either H
2
S or SO
2
(see Section 5.4.3). The instrument can only be
fitted with one type of permeation tube at a time. Therefore the IZS option can only be used to
calibrate or check the instrument for one gas, H
2
S or SO
2
, but not both.