Model 3100 Analyzer Instruction Manual
Page 18
Manual file name: MN-A-0005, Rev. C
Manual P/N: C5-06-4900-16-0
highest priority active system fault. Press and release the “UP” or “DOWN key to scroll through all active
system faults. Refer to section 4.3.1 for a complete fault code listing and troubleshooting guide. To exit,
press and release the “MODE” key.
3.2.5 Return to RUN mode
To exit and go back 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 ALM1, ALM2, and
FAULT LED’s will flash for 120 seconds to indicate that the analyzer is stabilizing. 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 and Alarm-2 relays remain inactive, holding to their last state before the
control panel user mode menu was accessed.
3.3 System modes
The Model 3100 has five System modes – Self-Test & Warm-up, RUN, Alarm-1 Active, Alarm-2 Active, or
Fault Active. Self-test & warm-up modes 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. Values are compared against monitored inputs and other monitored system hardware in real time.
3.3.1 Self-test & warm-up mode
When the Model 3100 is started up, it enters into Self-Test & Warm-up mode automatically, followed by a
sensor heater warm-up period (see section 2.2.1). When the sensor heater reaches operating
temperature, the analyzer aborts the warm-up routine, 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 3100 initiates “RUN” mode when it is continuously measuring the oxygen concentration of the
sample gas. The display and outputs are updated automatically until valid user input is detected. An
illuminated or flashing “RUN” LED indicates that the instrument is on-line and that the system is operating
properly.
When the measured process oxygen concentration falls outside of programmed alarm parameters or the
system experiences a fault condition, the Model 3100 analyzer enters into Alarm-1 Active, Alarm-2 Active,
and/or Fault Active mode accordingly. The system does not abort “RUN” mode -- the “RUN” indicator
LED stays lit. The appropriate indicator LED will illuminate in addition to the “RUN” indicator LED.
When programmed alarm setpoints and/or fault conditions are cleared, the Model 3100 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 will turn off.
When the Model 3100 analyzer detects valid user-input, it enters into one of the user modes –
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 and Alarm-2 relay outputs. The “RUN” indicator LED will
turn off, except when the unit is in Calibrate mode (“RUN” indicator will flash on and off).
When the user manually aborts all user modes by returning the system to “RUN” mode (or when no valid
user input is detected for 120-seconds), the Model 3100 checks the current sensor signal, updates the 7-
segment LED display, status LED’s, and analog outputs, and then enters into the appropriate system
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