Problem with PPU column

I am using MicroGC-490. Channel 1 has Mol. sieve 5Å column and channel 2 has PPU column. The GC has be shut for few months. Now, the signal from PPU column is acting strangely. The Mol. sieve channel is working properly. Can some help me identify what might have caused the problem. Attached are the detector response now  and before.

Parents Reply Children
No Data
Was this helpful?