Table 7 Troubleshooting Burner Issues
Problem | Possible Cause | Diagnosis | Corrective Action |
Fuses Blow on Startup | Shorted heater element. | Inspect for exposed wires or |
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| broken insulation around |
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| wire leads. Measure |
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| resistance leads, should not |
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| be 0. |
Take Burner top off and reseat insulation around heater leads.
Low Sensitivity | Leaks at ferrules or fittings. | For SCD, use a microliter | Inspect fittings for scoring |
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| syringe containing a small | and replace if necessary. |
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| amount of sulfur compound | Replace ferrules if worn. |
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| e.g., CS2 to “snoop” for leaks | Hand tighten all fittings |
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| while watching mV output. | mounted onto vespel |
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| Leaks are very evident by a | ferrules, and wrench tighten |
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| large increase in signal | all connections with Valco |
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| displayed on the LED. | ferrules. |
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| For NCD, a high background |
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| could be observed from |
|
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| atmospheric nitrogen. |
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Low Sensitivity | Improper gas flows. | Measure gas flows. | Reset gas flows. |
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Low Sensitivity | Broken ceramic tubes or | Remove and inspect tubes | Replace tubes or ferrules. |
| ferrules | and ferrules for chips and/or |
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High Pressure |
| breaks. |
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Low Sensitivity | Improper column | Inspect for charred Detector | After cutting off charred end |
| positioning. | end of column. | of column, measure column |
High Background |
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| length |
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| ferrule (or |
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| bottom of nut) and |
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| column. |
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116 | Operation and Maintenance Manual |
