You most likely need to change out the septum.<\/p>\n
Signs that the septum on a Mini GC is going bad:
\n1) The injection feels too easy. With a good septum, when you insert the needle into the injection port it should feel like you’re poking a pin through a sponge. There should be some small resistance. If you know you’ve done over 150 injections, it is a good idea to replace the septum anyway because it is likely to need to be replaced soon.
\n2) The Mini GC has trouble maintaining a high pressure (above 10 kPa) or reaches a desired pressure very, very slowly. If the septum is is really bad shape, you can even feel air leaking if you put your finger over the injection port.<\/p>\n
If you need replacement septa, here is the ordering info:\u00a0 https:\/\/www.vernier.com\/product\/gc-septa-package-of-4\/<\/a><\/a><\/p>\n To replace the septum, use a coin (nickel or quarter) to unscrew the injection port cap. Remove the old septum and drop in a new one, making sure the septum is sitting upright over the port.<\/p>\n If this does not fix the issue, please email chemistry@vernier.com<\/p>","protected":false},"excerpt":{"rendered":" You most likely need to change out the septum. Signs that the septum on a Mini GC is going bad: 1) The injection feels too…<\/p>\n","protected":false},"author":11015,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[3571,4236,3598,4235],"class_list":["post-2547","post","type-post","status-publish","format-standard","hentry","tag-gc-mini","tag-gc2-mini","tag-mini-gc","tag-septum"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/11015"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=2547"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2547\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=2547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=2547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=2547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}