Instruction Manual Model 3100 Analyzer
Manual P/N: C5-06-4900-16-0
Manual file name: MN-A-0005, Rev. C
Page 37
4.3 Troubleshooting
Fault codes
4.3.1
When trouble occurs during normal operation of the Model 3100, the user has several tools available to
aid in isolating the cause(s) of given symptoms. As a starting point, the user may use the control panel to
enter into “View Active Faults” mode (section 3.2.4). The user may also view active faults and other
useful information via the Service Port (section 4.1.2). In addition, there are four system Hot-Keys
available to perform special functions, and to gather important information quickly and easily (Appendix
D).
Descriptions of faults are given below, with indication of common causes. Refer to the appropriate
sections of this manual for more details as needed. The Neutronics Remote Sensor Module equipment
manual may be helpful in troubleshooting casualties related to that apparatus.
4.3.1.1 Fault Code 1 – Oven or sensor warming up
The “Oven or sensor warming-up” fault indicates that the oxygen sensor is being heated to its operating
temperature after a fresh power up. The purpose of the alarm is to provide a control output to indicate
that the sensor has not yet reached its operating temperature, and the model 3100 is not yet ready for in-
service oxygen measurement.
4.3.1.2 Fault Code 2 – Relays are in standby mode
The “Relays are in standby mode” fault indicates that the user has aborted the control panel user mode
menu properly (section 3.2.5), and the unit is in a stabilization period 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, Fault, and Heater OK relays remain inactive, and held to their last state before the control panel
user mode menu was accessed. The factory default setting for this period is 120-seconds. This setting is
user-configurable (section 4.1.2.10.8).
4.3.1.3 Fault Code 3 – Device is in setup mode – service port
The “Device is in setup mode” fault indicates that the user has entered the user setup mode from the
service port (section 4.1.2), and the model 3100 is not monitoring oxygen in the process. The 7-segment
alphanumeric display will show “SU”. The Device is in Setup Mode fault will clear when the user returns
the unit to RUN mode.
4.3.1.4 Fault Code 4 – Clean mode is active
The “Clean mode is active” mode indicates that the user has entered the sensor clean mode from the
control panel (section 4.1.1.9). This parameter allows the user to enable a sensor self-cleaning cycle if
the oxygen sensor has been exposed to chemicals or gases that could affect its performance. During
sensor clean mode, the 7-segment alphanumeric display will alternately show “CLE” and the temperature
of the sensor heater in degrees centigrade.
4.3.1.5 Fault Code 5 – Analog output range overflow
The “Analog output range overflow” fault indicates an O2 reading that is above the range configuration
entered in the model 3100 setup (section 4.1.2.12). Possible causes of fault code-5 may be: Incorrect
calibration gases, contaminated calibration gases, or faulty calibration sampling lines/components, or
faulty RSM sampling lines/components, system exposed to oxygen levels above the analyzer’s
configured range.
4.3.1.6 Fault Code 6 – Analog Output range underflow
The “Analog output range overflow” fault indicates an O2 reading that is below the range configuration
entered in the model 3100 setup (section 4.1.2.12). Possible causes of fault code-6 may be: Analog
Range lower limit set to a value greater than zero (section 4.1.2.11.1)
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