Troubleshooting
Manual Part Number:
5-06-4900-53-0
Revision Level: C
ECO 044952
Revision Date:
May 08, 2018
Page
4-21
4.3.1.6
Fault Code 6
– Unstable Calibration Sample
The Unstable Calibra
tion Sample fault indicates that during the “relay on to start sample delay”
(section 4.1.
2.14.1, and Appendix C), plus the “calibration sample period” (section 4.1.2.14.2, and
Appendix C), the analyzer detected a window of variation in the sensor output that exceeded the
Standard Deviation Error Limit (section 4.1.2.14.5). Possible causes may be, pressure fluctuations
from the sample exhaust (back-pressure), measured process not isolated from sensor during
calibration, calibration gas not applied, incorre
ct calibration gas, “Relay on to Start Sample Delay”
period not long enough.
4.3.1.7
Fault Code 7
– Sensor Calibration signal high
The Sensor Calibration Signal High fault indicates that during the Calibration Sample Period
(section 4.1.2.14.2), the analyzer detected a variation in the sensor output higher than the
Calibration Error Limit (section 4.1.2.14.4). Possible causes may be, pressure fluctuations from
the sample exhaust (back-pressure), measured process not isolated from sensor during
calibration, calibration gas not applied, incorrect calibration gas.
4.3.1.8
Fault Code 8
– Sensor Calibration Signal Low
The Sensor Calibration Signal Low fault indicates that during the Calibration Sample Period
(section 4.1.2.14.2), the analyzer detected a variation in the sensor output lower than the
Calibration Error Limit (section 4.1.2.14.4). Possible causes may be, pressure fluctuations from
the sample exhaust (back-pressure), measured process not isolated from sensor during
calibration, calibration gas not applied, incorrect calibration gas, sensor nearing the end of its
useful service period.
Helpful Hint: Fault Code 8 is an accurate measure for reliably determining that the Oxygen
Sensor’s useful service period has expired if factory settings are retained (section 4.1.2.14.4).
4.3.1.9
Fault Code 9
– Sensor Analog-to-Digital Converter Time-Out
The Sensor Analog-to-Digital Converter Time-out fault indicates that the Model Mini-ICS analyzer
has not received expected data signals from the Sensor Input Analog-to-Digital Converter. This
c
ondition is different from both a “Sensor Operating signal low” fault, and a “Sensor disconnected”
fault; it indicates a possible failure in the analyzer Analog-to-Digital converter hardware.
4.3.1.10
Fault Code 10
– Sensor Operating Signal Low
The Sensor Operating Signal Low fault indicates that the Oxygen Sensor output has fallen below
the “Low Sensor fault” setting (section 4.1.2.9.6 and Appendix C, Factory Setup). Possible causes
may be, sensor damaged internally, sensor fouled, sampling lines or other Neutronics Inc.
sampling components blocked (filters, heat-exchangers, scrubbers), measured process over-
purged with inert gas.
Helpful Hint:
The Low Sensor fault (section 4.1.2.9.6) setpoint is a system diagnostic to detect the
possibility of premature sensor failure. It should be set at an Oxygen level that is known by the
user never-to-be-reached in the measured process under normal circumstances.
4.3.1.11
Fault Code 11
– Calibration Period too Short
The Calibration Period Too Short fault indicates that the Model Mini-ICS analyzer has
unexpectedly aborted the Calibration process, and has not received information to complete the
routine. Please contact the Neutronics Inc. Service Department.
