{"id":2767,"date":"2025-07-30T16:00:11","date_gmt":"2025-07-30T16:00:11","guid":{"rendered":"https:\/\/discover.restek.com\/?p=2767"},"modified":"2025-12-09T01:30:39","modified_gmt":"2025-12-09T01:30:39","slug":"why-do-i-see-a-difference-between-the-gas-flow-reading-of-the-proflow-6000-flowmeter-and-the-gas-flow-reading-of-a-gas-chromatograph-gc","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/es\/faq\/gnot5209\/why-do-i-see-a-difference-between-the-gas-flow-reading-of-the-proflow-6000-flowmeter-and-the-gas-flow-reading-of-a-gas-chromatograph-gc","title":{"rendered":"Why do I see a difference between the gas flow reading of the ProFLOW 6000 flowmeter and the gas flow reading of a gas chromatograph (GC)?"},"content":{"rendered":"\n<p>All flowmeters have some degree of flow impedance. Connecting a flowmeter to a flow control system (including a GC) will present this impedance to the system as a load. Loading the system changes the system dynamics for which it was factory tuned. This will cause the flow control system to react differently and can result in a flow output that differs from the intended setpoint.<\/p>\n\n\n\n<p>Additionally, some GCs reference flow rates to normal temperature and pressure (NTP) or 25 \u00b0C and 1 atmosphere. This means that the flows displayed on the front of the GCs are only valid for the aforementioned reference conditions. The actual flow (which volumetric flowmeters display correctly) will differ based upon how much the present conditions vary from those reference conditions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"282\" height=\"400\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT1400-01.jpg\" alt=\"\" class=\"wp-image-21862\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT1400-01.jpg 282w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT1400-01-212x300.jpg 212w\" sizes=\"auto, (max-width: 282px) 100vw, 282px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>All flowmeters have some degree of flow impedance. Connecting a flowmeter to a flow control system (including a GC) will present this impedance to the system as a load. Loading the system changes the system dynamics for which it was factory tuned. This will cause the flow control system to react differently and can result&#8230;<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[23],"tags":[2686],"industries-application":[],"post-badge":[],"resource-type":[],"product-library":[],"resource-technique":[],"hf_cat_post":[625],"ppma_author":[414],"class_list":["post-2767","post","type-post","status-publish","format-standard","hentry","category-faq","tag-faq-proflow-6000-electronic-flowmeter"],"acf":[],"taxonomy_info":{"category":[{"value":23,"label":"FAQ"}],"post_tag":[{"value":2686,"label":"FAQ: ProFLOW 6000 Electronic Flowmeter"}]},"featured_image_src_large":false,"author_info":{"display_name":"Restek Corporation","author_link":"https:\/\/discover.restek.com\/es\/author\/restek-corporation\/"},"comment_info":0,"category_info":[{"term_id":23,"name":"FAQ","slug":"faq","term_group":0,"term_taxonomy_id":23,"taxonomy":"category","description":"","parent":0,"count":271,"filter":"raw","cat_ID":23,"category_count":271,"category_description":"","cat_name":"FAQ","category_nicename":"faq","category_parent":0}],"tag_info":[{"term_id":2686,"name":"FAQ: ProFLOW 6000 Electronic Flowmeter","slug":"faq-proflow-6000-electronic-flowmeter","term_group":0,"term_taxonomy_id":2686,"taxonomy":"post_tag","description":"Browse frequently asked questions for Restek's ProFLOW 6000 electronic flowmeter.","parent":0,"count":16,"filter":"raw"}],"authors":[{"term_id":414,"user_id":11,"is_guest":0,"slug":"restek-corporation","display_name":"Restek Corporation","avatar_url":{"url":"https:\/\/discover.restek.com\/wp-content\/uploads\/Restek_Favicon_300x300.jpg","url2x":"https:\/\/discover.restek.com\/wp-content\/uploads\/Restek_Favicon_300x300.jpg"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/posts\/2767","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/comments?post=2767"}],"version-history":[{"count":4,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/posts\/2767\/revisions"}],"predecessor-version":[{"id":71457,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/posts\/2767\/revisions\/71457"}],"wp:attachment":[{"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/media?parent=2767"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/categories?post=2767"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/tags?post=2767"},{"taxonomy":"industries-application","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/industries-application?post=2767"},{"taxonomy":"post-badge","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/post-badge?post=2767"},{"taxonomy":"resource-type","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/resource-type?post=2767"},{"taxonomy":"product-library","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/product-library?post=2767"},{"taxonomy":"resource-technique","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/resource-technique?post=2767"},{"taxonomy":"hf_cat_post","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/hf_cat_post?post=2767"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/discover.restek.com\/es\/wp-json\/wp\/v2\/ppma_author?post=2767"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}