Revision 1
23
9/10/2019
3.3 Analyzer Outputs
The 962-AGX analyzer generates both analog and digital output signals for connection to the
users’ plant control system. The analog signals include the measured concentrations of H
2
S.
The provided digital signals (relay contacts) represent indications of the current analyzer and
enclosure purge state.
3.3.1 Analog Outputs
The 962-AGX has one loop powered 4-20 mA signal for H
2
S concentration. The full scale
output for this signal is configurable.
3.3.2 Digital Outputs
There are four (4)
digital outputs
available from the analyzer. The
digital outputs
are present
in the form of zero potential form C relay contacts. The
digital outputs
are isolated to 250
V
rms
. The
digital outputs
are provided to indicate analyzer operational status. The operational
status outputs are:
•
Status (Fault / Normal)
•
Service (Warning / Normal)
•
Mode (Calibrate / Run)
•
Control (Manual / Auto).
a) Status (Fault / Normal) Indicator
The
Status (Fault / Normal)
output provides analyzer system readiness information.
Before ‘Normal’ status indication is given, the analyzer temperature zones and the
spectrometer signal must be within the specific set point ranges. This indicator will be in
the ‘Normal’ state
only when ALL
of the following are true:
•
The analyzer is receiving mains power.
•
The cell temperature is between the cell ‘Low Alarm’ temperature and ‘High Alarm’
temperature set points.
•
The last spectrometer ‘Measure’ scan was within range.
•
The last spectrometer ‘Reference’ scan was within range.
•
The last spectrometer ‘Dark’ scan was within range.
The purpose of this indicator is to signify an analyzer problem. When this indicator is in
the ‘Fault’ state, the analyzer will continue to flow sample gas but the reading is
considered to be invalid. Should the fault causing criterion clear, the analyzer will
automatically return to ‘Normal’ status
.
b) Service (Warning / Normal) Indicator
The
Service (Warning / Normal)
output indicates when service is requested. This
indicator will be in the ‘Normal’ state
unless one or more
of the following is true:
•
The control cabinet temperature is below 15ºC or over 40ºC.
•
The spectrometer integration period is greater than 500 ms.
•
The peak value of the absorbance vector is greater than 2.0.
•
The peak value of the raw scan during last zero is less than16000 counts
.
Summary of Contents for 962-AGX
Page 43: ...Revision 1 43 9 10 2019 Figure 4 13 Network Sub Panel...
Page 86: ...Revision 1 86 9 10 2019 Figure 9 1 Customer Connections...
Page 87: ...Revision 1 87 9 10 2019 Figure 9 2 Analyzer Components...
Page 88: ...Revision 1 88 9 10 2019 Figure 9 3 Inputs and Outputs...
Page 89: ...Revision 1 89 9 10 2019 Figure 9 4 AC Wiring Overview...
Page 90: ...Revision 1 90 9 10 2019 Figure 9 5 DC Wiring Overview...
