1. What does a sudden increase in GC column pressure mean?
A sudden increase in column pressure usually indicates a flow restriction or blockage in the column or gas path. This affects peak shape, retention time, and may cause detector errors or system downtime. Immediate troubleshooting is critical to avoid permanent damage to the column or instrument.
2. What are the most common causes of increased column pressure?
Contaminated or blocked inlet liner or column head
→ Usually caused by dirty samples or deteriorated septa
Column collapse or blockage
→ Thermal stress or particle accumulation restricts flow
Downstream carrier gas leak
→ Compensate by increasing upstream pressure
Faulty pressure sensor or regulator
→ May misread actual pressure, giving false alarms
Inlet temperature is too high
→ Causes stationary phase damage or vapor accumulation in the liner
3. How to solve the problem of high column pressure?
4. How to prevent sudden increase in column pressure?
5. When should GC column be replaced due to pressure problems?
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