{"id":49457,"date":"2026-08-03T23:55:38","date_gmt":"2026-08-03T23:55:38","guid":{"rendered":"https:\/\/alicatstage.wpenginepowered.com\/?post_type=support&p=49457"},"modified":"2026-08-04T16:21:12","modified_gmt":"2026-08-04T16:21:12","slug":"durchflussdruck-gc-analysator-fur-gefahrliche-stoffe","status":"publish","type":"support","link":"https:\/\/www.alicat.com\/de\/support\/flow-pressure-hazardous-gc-analyzer\/","title":{"rendered":"Durchfluss- und Druckregelung in GC-Analysesystemen f\u00fcr explosionsgef\u00e4hrdete Bereiche"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”4.27.7″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”0px||0px||true|false” locked=”off” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_heading title=”Flow & Pressure Control in Hazardous-Area GC & Analyzer Systems” _builder_version=”4.27.7″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][\/et_pb_heading][et_pb_heading title=”Introduction and context:” _builder_version=”4.27.7″ _module_preset=”default” title_level=”h2″ global_colors_info=”{}” theme_builder_area=”post_content”][\/et_pb_heading][et_pb_image src=”https:\/\/www.alicat.com\/wp-content\/uploads\/2026\/08\/engineers-inspect-hydrogen-tank.webp” alt=”Photo of engineers inspecting a hydrogen tank valve regulator” _builder_version=”4.27.7″ _module_preset=”default” max_width=”50%” max_width_tablet=”80%” max_width_phone=”100%” max_width_last_edited=”on|phone” custom_margin=”8px||||false|false” custom_padding=”||2rem|2rem|false|false” custom_padding_tablet=”1rem||2rem|0rem|false|false” custom_padding_phone=”1rem||2rem|0rem|false|false” custom_padding_last_edited=”on|tablet” module_alignment_tablet=”center” module_alignment_phone=”center” module_alignment_last_edited=”on|phone” custom_css_main_element=”float: right;” global_colors_info=”{}” custom_css_main_element_last_edited=”on|tablet” custom_css_main_element_phone=”float: none;” custom_css_main_element_tablet=”float: none;” theme_builder_area=”post_content”][\/et_pb_image][et_pb_text _builder_version=”4.27.7″ _module_preset=”default” custom_margin=”||2rem||false|false” global_colors_info=”{}” theme_builder_area=”post_content”]<\/p>\n

In oil refining and petrochemical processing environments, online gas chromatography (GC) is one of the most critical analytical tools used for continuous process optimization, product quality, and safety assurance.<\/p>\n

GCs are used to analyze the composition of several petrochemical samples and products in the oil and gas industry, such as:<\/p>\n

    \n
  1. Sulfur content and vapor pressure for regulatory compliance<\/li>\n
  2. RON\/CETANE values for fuel performance indicators<\/li>\n
  3. Hydrocarbon compositions for process optimization<\/li>\n
  4. Toxic and hazardous compound detection (H2S, BTX, and flammables)<\/li>\n<\/ol>\n

    Unlike lab-based analysis, these GCs are integrated directly into the process environment, where they must operate continuously and reliably under demanding conditions. Stable and precise control of gas flow and pressure directly determines accuracy of the analysis, repeatability, and reliability of the system. <\/strong><\/p>\n

    However, when these systems are deployed in hazardous environments, the types of instrumentation available are limited.<\/p>\n

    [\/et_pb_text][et_pb_heading title=”Hazardous area constraints:” _builder_version=”4.27.7″ _module_preset=”default” title_level=”h2″ global_colors_info=”{}” theme_builder_area=”post_content”][\/et_pb_heading][et_pb_text _builder_version=”4.27.7″ _module_preset=”default” custom_margin=”||2rem||false|false” global_colors_info=”{}” theme_builder_area=”post_content”]<\/p>\n

    These applications are deployed in ATEX Zone 0\/ Zone 1, or Class I Division 1 hazardous locations. These zones indicate a continuous or frequent presence of explosive gases, and strict requirements for ignition prevention.<\/p>\n

    Instrumentation installed in such areas must be intrinsically safe<\/a>, hence limiting the electrical and thermal energy available to ignite flammable materials. Alternatively, explosion-proof enclosures or special purge\/pressurization systems must be implemented. These will typically increase overall cost, footprint, system complexity, and maintenance.<\/p>\n

    [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.7″ _module_preset=”default” custom_margin=”||2rem||false|false” custom_padding=”25px||25px|25px|true|false” border_width_left=”6px” border_color_left=”#E12028″ locked=”off” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_text admin_label=”App Note Header – Outcomes” module_class=”article-section-label” _builder_version=”4.27.7″ _module_preset=”default” header_2_font=”||||||||” header_2_text_color=”#808080″ header_2_font_size=”28px” custom_margin=”||1rem||false|false” custom_css_free_form=”selector span {|| border-bottom: 1px solid #000;|| padding-bottom: 5px;||}” saved_tabs=”all” global_colors_info=”{}” theme_builder_area=”post_content”]<\/p>\n

    Legacy Approach<\/p>\n

    [\/et_pb_text][et_pb_heading title=”Mechanical control systems ” _builder_version=”4.27.7″ _module_preset=”default” title_level=”h2″ global_colors_info=”{}” theme_builder_area=”post_content”][\/et_pb_heading][et_pb_text _builder_version=”4.27.7″ _module_preset=”default” custom_margin=”||0px||false|false” global_colors_info=”{}” theme_builder_area=”post_content”]<\/p>\n

    In the past, to comply with the safety standards, customers relied on full mechanical control which typically consisted of armored rotameters, analog gauges, and needle valves. The simplicity of mechanical instrumentation reduced challenges involved with meeting safety requirements.<\/p>\n

    With the implementation of mechanical solutions, several limitations were observed in the field.<\/p>\n

    Performance instability<\/p>\n