Hello,

I am using a PAC HT7500 HTGC for analyzing asphalt (Bitumen) product [1 %w with CS2 solvent]. The problem is I am getting a found recovery > 100 % and of course the Used recovery becomes 100 %.

Yesterday I got 77% on both. The only difference is that i have a fresh reference standard sample (RSS) (routine step) that the software used (SIMDIS). The RSS was perfect and withing the error limits. However my samples are now showing found recovery > 100 %.

Any explanation to what is happening??

Bitumen_GBG