3.2.5 Return to RUN Mode
To exit to run mode from any user mode, using the keypad; scroll through the control panel user
mode menu by pressing repeatedly the “MODE” key until the 7-segment alphanumeric display
shows ”run”. The display will then show an oxygen concentration. The “RUN”, “ALM1”, “ALM2”,
and “FAULT” LED’s will flash for 120 seconds to indicate that the analyzer is in a stabilization
period. This is to allow time to sweep the sample lines with sample gas before returning the unit to
on-line service. During the stabilization period, alarm-1, alarm-2, and fault, relays remain inactive,
and held to their last state before the control panel user mode menu was accessed.
3.3 System Modes
The model 1100 has five System modes – Self-Test & warm-up, Run, Alarm-1 Active, Alarm-2
Active, or Fault Active. Self-test & warm-up are fixed routines that are initiated upon each start-up.
The remaining system modes, provided no valid manual input is received at the control panel or
service port, are initiated automatically by the analyzer according to setup parameters entered by
the user in setup mode, compared against monitored inputs and other monitored system hardware
in real time.
3.3.1 Self-Test & Warm-up Mode
When the model 1100 is started up, it enters into Self-Test & Warm-up mode automatically
(section 2.2.1). When the analyzer self-test is complete, the unit 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.
3.3.2 RUN Mode
The model 1100 initiates Run mode when it is continuously measuring the oxygen concentration of
the in-service sample gas, and updating the display and outputs accordingly, and it has not
detected any valid user input. A solid lit or flashing “RUN” indicator LED indicates to the user that
the instrument is on-line, and the system is operating properly.
When the measured process oxygen concentration falls outside of programmed alarm parameters,
and/or the system experiences a fault condition, the model 1100 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 1100 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 1100 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 1100 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.
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