Galvanic Applied Sciences 943-TGS-CE, Operation Manual

Page: 53 / 158

Revision 5 53 August 2021
Figure 24: Air Demand Value and Trend
The air demand reading is an indicator of the current process status relative to the optimal
ratio (typically a 2:1 ratio H
2
S:SO
2
). If the air demand value is negative, this indicates that
the H
2
S concentration is too high and there is insufficient air being added. If the air demand
value is positive, this indicates that the SO
2
concentration is too high and there is excess air
being added. If the air demand is zero, this indicates that the H
2
S to SO
2
ratio is at the optimal
value and the air does not need to be adjusted.
The graphical trend displayed below the Air Demand field shows the trend in the air demand
data over a recent period of time, with the current value at the right side of the graph. The x-
axis (time) and y-axis (concentration) ranges of this graph can be adjusted on the
Configuration Panel Display Sub-panel (refer to Section 4.8.3). This trend is updated once
per second.
4.3.4 Relay Indicator Fields
The relay indicators at the bottom right of the Analysis 1 panel indicate the current state of
the analyzer’s four relay outputs. The relay indicators are shown in Figure 25.