Super Systems PH2 - Manual (Page 11)

10
SSi Portable Hydrogen Analyzer
Rev A
Kn can only be calculated by entering the flow of Nitrogen (N
2
), Ammonia (NH
3
) and Dissociated
Ammonia (DA). These values are entered at the bottom of the home screen when Kn is
selected.
To change the display, click on Mode and press Edit. This will allow the operator to choose
between Hydrogen, Dissociation, NH
3
, and Kn for analysis and display. Select the appropriate
mode and press Ok to modify this option.
Minimum H
2
for NH
3
display
There may be times when the process is not active. During these times, the measured
Hydrogen value displayed on the screen will remain valid, but the calculated % NH
3
will not be
valid since it is based on the assumption that the known process gases are involved. In these
cases, it may be more desirable to hide the display of NH
3
instead of displaying a value that is
known to be incorrect. This can be done by setting a minimum level of H
2
that will be present
when the process is active. When the Hydrogen drops below this level, the instrument will know
that the process is not active and the NH
3
readings are not valid so it will not display NH
3
.
Output Configuration
There is one 4-20mA output that can be configured for any of the four parameters. The operator
can select the Source (H
2
, DA, NH
3
, Kn), the zero value (the value to be represented by 4mA) and
the span value (the value to be represented by 20mA).