When the measured process oxygen concentration falls outside of programmed alarm parameters, and/or
the system experiences a fault condition, the Model 7100E analyzer enters into Alarm-1 Active, Alarm-2
Active, and/or Fault Active mode accordingly. The system does not abort Run mode, and the “RUN”
indicator LED stays lit. The appropriate indicator LED will light in addition to the “RUN” indicator LED.
When programmed alarm setpoints and/or fault conditions are cleared, the Model 7100E analyzer aborts
Alarm-1 Active, Alarm-2 Active, and/or Fault Active mode accordingly. The system does not abort Run
mode, and the “RUN” indicator LED stays lit. Indicator LED’s mapped to aborted modes go out.
When the Model 7100E analyzer detects valid user-input, it enters into one of the user modes accordingly
– Calibration, Set/View Alarm-1, Set/View Alarm-2, View Active Faults, or User Setup. The analyzer
aborts Run mode and holds the state of Alarm-1, Alarm-2, and Fault. The “RUN” indicator LED goes out,
except in Calibrate mode, where it flashes.
When the user manually aborts all user modes by returning the system to Run mode, or no valid user
input is detected for 120-seconds, the Model 7100E checks the current sensor signal, updates the 7-
segment LED display, status LED’s, and Analog outputs, then enters into the appropriate system mode
according to its programmed parameters. Alarm-1, Alarm-2, and Fault relay outputs are released and the
“RUN” indicator LED is lit.
Alarm-1 Active mode
The Model 7100E initiates Alarm-1 Active mode when it has detected that the measured oxygen
concentration has exceed the set threshold value of Alarm-1 (section 3.2.2). The “ALM1” indicator LED
will light, The “RUN” indicator LED will remain lit. The Alarm-1 relay will change state according to the
analyzer configuration (Appendix C, Factory Setup). The Alarm status will be cleared automatically when
the measured oxygen concentration is within the set threshold value of Alarm-1. The “ALM1” indicator
LED will turn off and the Alarm-1 relay will return to its non-active state according to the analyzer
configuration. The Alarm-1 Active mode is held to its last state during manual access to the user mode
menu.
Alarm-2 Active mode
The Model 7100E initiates Alarm-2 Active mode when it has detected that the measured oxygen
concentration has exceed the set threshold value of Alarm-2 (section 3.2.3). The “ALM2” indicator LED
will light, The “RUN” indicator LED will remain lit. The Alarm-2 relay will change state according to the
analyzer configuration (Appendix C, Factory Setup). The Alarm status will be cleared automatically when
the measured oxygen concentration is within the set threshold value of Alarm-2. The “ALM2” indicator
LED will turn off and the Alarm-2 relay will return to its non-active state according to the analyzer
configuration. The Alarm-2 Active mode is held to its last state during manual access to the user mode
menu.
FAULT ACTIVE mode
The Model 7100E initiates Fault Active mode when it has detected that one or more Fault conditions have
been satisfied (section 4.3.1). The “FAULT” indicator LED will light and the Fault relay will change state.
The Fault status will be cleared automatically when no Fault conditions have been satisfied. The “FAULT”
indicator LED will turn off and the Fault relay will return to its non-active state. The user may view active
faults at any time from the control panel (refer to section 3.2.4).
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