Ntron SIL O2, User'S Operation Manual, Page: 21 / 56

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Action: Red Fault LED illuminated when none of the above conditions are present.
Problem: Analyser in fault condition. Analyser display and Analogue output will read a fault value.
(28% O2 displayed and 22mA)
Solution: Internal Analyser electronics or programming fault. Try Power On/Off cycle to reset.
If fault does not clear then seek further assistance.
Problem: No Analyser display (Blank)
Solution: Analogue output circuit is broken or interrupted. Investigate and repair.
3.4.1 Possible Sensor Faults
Applicable to all sensor types (OC-25, OC-26, OC-200)
Problem:. SIL O2 Analyser will not calibrate (Cannot be set to 20.9%)
Solution: Sensor is at end of life. Sensor has been wetted or contaminated. The Sensor output signal can be
checked at the SIL O2 Analyser terminals 14 and 16. See specification section for details of a healthy
output signal.
Problem:. SIL O2 Analyser reads Zero (0.00)
Solution: Actual low Oxygen measurement. Sensor wires have been shorted together, damaging the Sensor.
Verify the Oxygen level by other means. Check the Sensor output signal. Replace Sensor as necessary.