Safety Cutoff - Thermo Scientific EA IsoLink IRMS System Operating Manual

8
Troubleshooting

Safety Cutoff

Table 25. Analytical Troubleshooting Guide (Sheet 2 of 2)
Problem
Peak between nitrogen and carbon
peaks.
High carbon blank.
Decreasing nitrogen blank values.
Increasing nitrogen blank values.
Retention times very delayed respect
the normal chromatogram.
Safety Cutoff
Instrument malfunctioning, due to a component failure or to abnormal operating conditions, is
identified by the red lighting of the Safety Cutoff LED indicator. See
Figure 145. Safety Cutoff LED
When lit, this LED indicates that the furnaces and detector oven power has been cut off for safety
reasons.
The Safety Cutoff status is followed by an error message about the possible cause of error.
138 EA IsoLink IRMS System for CNSOH Operating Manual
Diagnosis
Oxygen line contaminated.
Inadequate oxygen purity.
Inadequate oxygen dosage.
Tin containers contaminated.
Memory effect due to bad combustion
of previously run analyses.
Oxygen line contaminated.
Copper exhausted
Presence of leaks in the pneumatic
circuit.
Presence of obstructions in the
pneumatic circuit.
Remedy
Exclude autosampler and check the
oxygen blank.
Use Oxygen with adequate purity.
Exclude autosampler and check the
oxygen blank.
Increase oxygen injection time.
Check the tin container box, tweezers,
work bench are clean.
Remove ash and analyze lower
amounts of sample.
Wait 10-20 minutes for complete
purging of the oxygen line.
Repeat blank analysis.
Replace the reactor.
Perform Leak Test.
Reach and remove the obstruction
dissecting the pneumatic circuit.
Figure 145
Safety Cutoff LED
Thermo Scientific