Revision 14
107 August 02, 2019
will be triggered, the alarm LED on the front panel will turn on, the event will be listed in the
Event Log and on the Analyzer Alarm list on the analyzer LCD screen, and any outputs
associated with this alarm will also be triggered. Once the concentration of the normal
stream drops back below the Alarm 1 set point, the alarm LED will turn off, Alarm 1 will be
cleared from the Analyzer Alarm List, and any unlatched outputs associated with Alarm 1
will return to their non-triggered state. Any latched outputs associated with this alarm will
have to be manually cleared through the application program.
• % Deviation Enable - If this box is checked then the limit value entered will be used as an
alarm point. This alarm will activate when consequent runs vary from each other by a
greater percentage than the value set in the limit field.
• High-High Alarm Enable – If this box is checked then the limit value entered will be used
as an alarm point. The High-High Alarm also known as the Predictive Alarm Analysis (PAA)
alarm mode is an alarm mode that triggers when the live calculated concentration at any
point during the analysis cycle exceeds the High-High alarm set point. When the
ProTech903 enters this PAA mode, the concentration displayed on the ProTech903’s LCD
screen immediately begins to update with the live concentration value once per second. In
addition, any analog output (
Modbus registers will not be updated until the cycle is complete)
that is currently outputting the stream normal concentration value will also output the live
value of the concentration once per second while the analyzer is in PAA mode.
When the analyzer is in PAA mode, this alarm will be listed in the Analyzer Alarm list, as
well as in the Event Log, and the red ALARM LED on the front panel of the analyzer will
also be lit. Any outputs associated with this alarm mode will also be triggered. Once the
concentration of the normal stream drops back below the PAA set point, the alarm LED will
turn off, PAA will be cleared from the Analyzer Alarm List, and any unlatched outputs
associated with PAA will return to their non-triggered state. Any latched outputs associated
with this alarm will have to be manually cleared through the GUI.
• High-High Alarm Duration - The number (seconds) entered in this field represents the
time required for the High-High alarm to be active before the alarm would register. This
would alleviate the alarm bouncing on and off if the concentration reading was close to the
alarm set point.
• Lock Alarm Enable -If this box is checked then the limit value entered will be used as an
alarm point. This alarm set point if pasted will lock the analyzer in whatever stream it is
currently and will not allow the analyzer to proceed to other enabled gas runs.
5.10.4 Calibration, Reference and Zero Gas Tabs
5.10.4.1 Calibration Tab
The Calibration tab is set up very similarly to the H2S tab, with a few notable differences. The
calibration run can be set up to automatically calibrate the analyzer and calculate a new gain
factor if the analyzer is equipped with the auto-calibration option. The Calibration run can be
triggered to start a number of ways such as: a discrete input, an automatic or manual
sequence entry, a timed schedule entry, through the keypad or simply by hitting the Stream
Calibration button.
If any analysis alarms have been triggered on the H
2
S run (i.e. High or High
High), any calibration run triggered from the application program will be
put into the run queue and not run until the alarm condition(s) has/have
cleared.
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