{"id":74,"date":"2012-05-26T10:45:16","date_gmt":"2012-05-26T17:45:16","guid":{"rendered":"https:\/\/www.gasdetection.com\/?page_id=74"},"modified":"2022-12-17T09:50:11","modified_gmt":"2022-12-17T17:50:11","slug":"gas-detection-applications-primer","status":"publish","type":"page","link":"http:\/\/www.gasdetection.com\/the-tech-center\/how-do-i-get-started\/gas-detection-applications-primer\/","title":{"rendered":"Gas Detection Applications Primer"},"content":{"rendered":"<p><!--image--> <img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-13274\" src=\"https:\/\/www.gasdetection.com\/wp-content\/uploads\/gas_detection_applications_primer.jpg\" alt=\"Gas detection applications primer\" width=\"300\" height=\"200\" \/><\/p>\n<h2>Commonly Used Terms for Gas Detection Applications<\/h2>\n<ul>\n<li class=\"none\"><strong>PPM: Part(s) Per Million<\/strong><br \/>\nA unit of concentration, pertaining to a gas mixture, defined as the ratio between the volume of an individual component\u00a0<em>V<\/em><sub><em>i<\/em><\/sub>\u00a0 and the total volume \u00a0<em>V<\/em><sub><em>total<\/em><\/sub>\u00a0\u00a0:<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.gasdetection.com\/wp-content\/uploads\/ppm.jpg\" alt=\"ppm\" width=\"173\" height=\"54\" \/><br \/>\n10,000 parts per million equals one percent. Other concentration units are discussed <a href=\"https:\/\/www.gasdetection.com\/knowledge-base\/calculations-and-conversions\/using-common-sense-and-science-in-expressing-gas-concentrations\/\">here<\/a>.<\/li>\n<li class=\"none\"><strong>LEL: Lower Explosive Limit<\/strong><br \/>\nThe lowest concentration of a gas in air, which, when ignited, will sustain combustion. [<a href=\"https:\/\/www.gasdetection.com\/the-tech-center\/useful-formulae-conversions-etc\/information-tables-flammable-combustible-compounds\/\">LELs for many gases of interest<\/a>]<\/li>\n<li class=\"none\"><strong>TLV: Threshold Limit Value<\/strong><br \/>\nThis refers to airborne concentrations of substances, and represent conditions under which nearly all workers may be repeatedly exposed day after day without adverse health effects.\u00a0&#8220;TLV&#8221; is a trademark of the <a href=\"https:\/\/www.acgih.org\/\">American Conference of Governmental Industrial Hygienists<\/a>.<\/li>\n<\/ul>\n<div class=\"whitespace10\"><\/div>\n<h2>There are three categories of TLVs<\/h2>\n<ul>\n<li class=\"none\"><strong>TLV &#8211; TWA: Time Weighted Average<\/strong><br \/>\nThis refers to a time weighted AVERAGE concentration for a normal 8 hour day, in a 40 hour work week in which MOST workers can be exposed REPEATEDLY without adverse effect.<\/li>\n<li class=\"none\"><strong>TLV &#8211; STEL: Short Term Exposure Limit<\/strong><br \/>\nThis is the concentration in which most workers can be exposed CONTINUOUSLY for a SHORT period of time without suffering from irritation, chronic or irreversible tissue damage, or narcosis to the degree which would impair self rescue, work efficiency or cause accidents, PROVIDED that the TWA has not been exceeded. Further, a STEL is a 15 minute TWA which should not be exceeded any time during a normal work day even if the worker is within the 8 hour TWA. Exposures ABOVE the TWA and UP TO the STEL should not be longer than 15 minutes and should not exceed 4 times a day.<\/li>\n<li class=\"none\"><strong>TLV &#8211; C: Ceiling<\/strong><br \/>\nThis is a concentration which should not be exceeded during any part of the working exposure.<\/li>\n<\/ul>\n<p><a name=\"OSHA\"><\/a><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.acgih.org\/science\/tlv-bei-guidelines\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-size: small;\">More detail on TLVs<\/span><\/a><\/p>\n<hr style=\"width: 100%;\" \/>\n<p align=\"left\">OSHA has promulgated <a href=\"http:\/\/www.osha.gov\/pls\/oshaweb\/owadisp.show_document?p_table=STANDARDS&amp;p_id=9991\" target=\"_blank\" rel=\"noopener noreferrer\">PELs<\/a> (Permissible Exposure Limits) for many substances, and these have the force of law behind them. In general, the PELs are 8-hour time weighted averages, but ceiling limits have been established for some chemicals. <a href=\"https:\/\/www.osha.gov\/annotated-pels\/table-z-1\" target=\"_blank\" rel=\"noopener noreferrer\">29 CFR 1910.1000 Table Z-1<\/a> details these values. In certain cases\u2014such as <a href=\"http:\/\/www.osha.gov\/pls\/oshaweb\/owadisp.show_document?p_table=standards&amp;p_id=10070\" target=\"_blank\" rel=\"noopener noreferrer\">ethylene oxide<\/a>\u2014this table refers to a separate section within 29 CFR 1910.<\/p>\n<p>Per 29 CFR 1910.1000(a)(1), the\u00a0<a href=\"https:\/\/www.osha.gov\/pls\/oshaweb\/owadisp.show_document?p_table=STANDARDS&amp;p_id=9991\">Ceiling Value<\/a>\u00a0sets a concentration which shall at no time exceed the exposure limit given for that substance. If instantaneous monitoring is not feasible, then the ceiling shall be assessed as a 15-minute time weighted average exposure which shall not be exceeded at any time during the working day.<\/p>\n<p align=\"left\">The OSHA <a href=\"https:\/\/www.osha.gov\/pls\/oshaweb\/owadisp.show_document?p_table=STANDARDS&amp;p_id=10106\">Action Level<\/a>\u2014calculated as an eight (8)-hour time-weighted average (and generally lower than the PEL)\u2014is a concentration designated for specific substances listed in 29 CFR part 1910 that initiates certain required activities such as exposure monitoring and medical surveillance. [29 CFR 1910.1450(b)].\u00a0 <a href=\"https:\/\/www.cdc.gov\/niosh\/docs\/76-131\/pdfs\/76-131.pdf\">Historically<\/a>, unless otherwise specified, the Action Level is set to one-half of the PEL.<\/p>\n<p align=\"left\">NIOSH issues its <a href=\"http:\/\/www.cdc.gov\/niosh\/npg\/pgintrod.html#nioshrecs\" target=\"_blank\" rel=\"noopener noreferrer\">RELs<\/a> (Recommended Exposure Limits), as well. The OSHA standards and NIOSH guidelines are often, but not always, in harmony with the ACGIH TLVs. Similar bodies exist in other countries. It is prudent to consider the recommendations of all relevant agencies, before formulating your occupational health strategy.<\/p>\n<hr style=\"width: 100%;\" \/>\n<h2>Application Types<\/h2>\n<ul>\n<li class=\"none\"><strong>Workplace Monitoring<\/strong><br \/>\nrefers to measuring the work environment (generally indoors), for monitoring worker safety, for OSHA compliance or industrial hygiene surveys. The appropriate instrumentation to be recommended in this case are monitors designed with the intent to be sensitive, and accurate to address TLV levels and below. Generally these monitors are NOT designed to measure high concentration levels. It may be of interest to monitor combustible gases in the workplace, to make sure that their concentrations are well below the LEL.<\/li>\n<li class=\"none\"><strong>Process Monitoring<\/strong><br \/>\nrefers to an application where a constant stream of gas will be present. In most of these cases, the customer will want to measure a change in the gas concentration, for process control, rather than personnel safety reasons.<\/li>\n<li class=\"none\"><strong>Stack Monitoring<\/strong><br \/>\napplications refer to monitoring stack emissions, to meet EPA compliance.<\/li>\n<\/ul>\n<div class=\"whitespace10\"><\/div>\n<h2>Further Defining The Application<\/h2>\n<ol>\n<li>\u00a0 \u00a0 Do you need a portable, direct-reading survey monitor for occasional spot check monitoring, or rather a stationary, installed area monitor to operate on a round-the-clock basis?<\/li>\n<li>\u00a0 \u00a0 Do you simply require a personal alarm device to be worn under certain circumstances?<\/li>\n<li>\u00a0 \u00a0 What full-scale measuring range is required?<\/li>\n<li>\u00a0 \u00a0 What other possible gases may be present which could cause a <a title=\"Interfering Gas\u00a0Data\" href=\"https:\/\/www.gasdetection.com\/knowledge-base\/best-practices\/understanding-interferences-in-gas-detection\/\">cross interference<\/a>?<\/li>\n<li>\u00a0 \u00a0 What type of alarm capability is required? Do you need alarm signaling devices, or merely relay contact closures?<\/li>\n<li>\u00a0 \u00a0 Would you like <a title=\"Data Logging and Data Acquisition in Gas Detection\" href=\"https:\/\/www.gasdetection.com\/knowledge-base\/alarms-and-regulatory-compliance\/data-logging-and-data-acquisition-in-gas-detection\/\">data acquisition<\/a> capability? This can be especially important to fend off lawsuits.<\/li>\n<\/ol>\n<div class=\"whitespace10\"><\/div>\n<h2>Calibration And Maintenance<\/h2>\n<p>All gas detection instruments must be calibrated against a known gas standard, and will have other maintenance requirements. Proper calibration is about 90 percent of successful gas detection. Here is what OSHA says about <a href=\"https:\/\/www.osha.gov\/publications\/shib093013\" target=\"_blank\" rel=\"noopener noreferrer\">calibration<\/a>.<\/p>\n<p>Calibration standards for certain gases may present special difficulties. While many gas standards can be supplied in cylinders, others must be obtained as permeation devices. In fact, several of the most toxic compounds, which need standardization at low concentration, will only be available as permeation devices. And, for some substances, <a href=\"https:\/\/www.gasdetection.com\/gas-detection-knowledge-base\/calibration-issues\/calibration-hydrogen-peroxide-peracetic-acid-gas-analyzers\/\">no commercial calibration standard is available<\/a>.\u00a0 Even with these, we can help.<\/p>\n<p>Check out OSHA&#8217;s <a href=\"http:\/\/www.osha.gov\/dts\/osta\/otm\/otm_ii\/otm_ii_3.html#direct-reading_instrumentation\">Technical Manual<\/a><\/p>\n<p>Refer also to our <a title=\"Gas Detection Knowledge Base\" href=\"https:\/\/www.gasdetection.com\/articles\/knowledge-base\/\">Knowledge Base<\/a> and the article posted <a href=\"https:\/\/www.gasdetection.com\/wp-content\/uploads\/the_synergist_oct_05.pdf\">here<\/a> (pdf), originally published in AIHA&#8217;s <em>The Synergist<\/em>.<\/p>\n<p>Contact <a href=\"mailto:&#x69;&#x6e;&#x66;&#x6f;&#x40;&#x67;&#x61;&#x73;&#x64;&#x65;&#x74;&#x65;&#x63;&#x74;&#x69;&#x6f;&#x6e;&#x2e;&#x63;&#x6f;&#x6d;\">Interscan<\/a> for further information on calibration.<\/p>","protected":false},"excerpt":{"rendered":"<p>Commonly Used Terms for Gas Detection Applications PPM: Part(s) Per Million A unit of concentration, pertaining to a gas mixture, defined as the ratio between the volume of an individual component\u00a0Vi\u00a0 and the total volume \u00a0Vtotal\u00a0\u00a0: 10,000 parts per million equals one percent. Other concentration units are discussed here. LEL: Lower Explosive Limit The lowest&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":82,"menu_order":75,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.5 (Yoast SEO v22.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Gas Detection Applications Primer - Interscan Corporation<\/title>\n<meta name=\"description\" content=\"An introduction to gas detection applications. Gives basic definitions of key terms, and provides insight on regulatory levels set by OSHA. 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