"Restriction missing" when running the purge injector HPLC

Dear friends,

Today i observed "Restriction missing" when running the purge injector on Alliance 2695 HPLC system. I connected column and with the column i m getting 2000 pressure with 1.5ml/min flow.I done Several times  purge injector by enabling compression check. problem is still persists. 

could you please give some guidance in order to resolve it? 


  • Compression checks require a column or a back pressure regulator. You need more than 2000psi, so get a similar column with smaller packed particles or add another column.
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