I am having problem with back inlet of GC-FID (6890 agilent series) instrument. The pressure of the back inlet is not upto its set point but only half of pressure is observed.
I change merlin mciroseal, gold plated seal on back inlet but still no increase in pressure. The liner is split(4mm id, part no. 5183-4647 agilent).
Everything is working fine apart from pressure of back inlet and try without column by blocking the back inlet with block spetum but still no pressure increase.
Would anyone can suggest me the reason behind this and to affix problem. Any help really appreciate and if you want more details please do reply.
Many thanks in advance