Hi all,

I have a GC PAL (A200S) autosampler used with a gas bench. I recently replaced the PAL controller with a new one. All the settings on the GC PAL are the same as they were on the old one. The problem I am having is that every time I try to run a sequence the autosampler will move to the correct position, and the black bottom part of the syringe holder will bang on the sample block twice and then I get a message which reads "Collision before Z tolerance." I have changed the z tolerance setting to quite a few other settings, which hasn't helped. Has anyone seen this before, and do you know how to fix this? Thanks in advance for any advice!



Dana Biasatti
Stable Isotope Specialist
Center for Environmental Science and Technology
University of Notre Dame
Notre Dame, IN