{"id":16202,"date":"2022-05-17T19:15:06","date_gmt":"2022-05-17T19:15:06","guid":{"rendered":"https:\/\/chevrierinstruments.com\/produit\/photohelic-differential-pressure-switches\/"},"modified":"2025-12-22T18:27:15","modified_gmt":"2025-12-22T18:27:15","slug":"photohelic-differential-pressure-switches","status":"publish","type":"product","link":"https:\/\/chevrierinstruments.com\/en\/produit\/photohelic-differential-pressure-switches\/","title":{"rendered":"Photohelic differential pressure switches"},"content":{"rendered":"<p>The A3000 Series Photohelic\u00ae pressure\/gauge switches function as versatile, highly repeatable pressure switches combined with a precision gauge using the proven Magnehelic\u00ae gauge design. The Photohelic\u00ae pressure\/gauge switches measure and control positive, negative, or differential pressures of air and compatible gases. Standard models are rated for a pressure of 25 psig (1.7 bar), with options up to 35 psig (2.4 bar) or 80 psig (5.5 bar). Two DPDT phototransistor relays are included for high and low limit control. The easy-to-adjust setpoint indicators are controlled by knobs on the gauge face. The dead zone for each setpoint is the width of a needle, less than 1% of full scale. Setpoints can be locked to provide a variable dead zone, ideal for controlling fans, dampers, and other devices. The pressure gauge reading is continuous and unaffected by the pressure switch operation, even in the event of a power outage. Choose from full-scale pressure ranges from 0 to 0.25 inches (0 to 6 mm) of water column, up to 30 psi (21 bar).<\/p>\n<h4>Product Applications<\/h4>\n<ul>\n<li>Air Conditioning Systems<\/li>\n<li>Cleanrooms<\/li>\n<li>Fume Extraction Systems<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<h2>A3000 Series<\/h2>\n<p>Photohelic\u00ae A3000 Switches\/Pressure Gauges for pressure measurement up to 25 psig<\/p>\n","protected":false},"featured_media":16201,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[54],"product_tag":[586],"class_list":{"0":"post-16202","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-pressure","7":"product_tag-pressure-switch","9":"first","10":"instock","11":"shipping-taxable","12":"product-type-simple"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Photohelic differential pressure switches - Chevrier Instruments inc.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/chevrierinstruments.com\/en\/produit\/photohelic-differential-pressure-switches\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Photohelic differential pressure switches - Chevrier Instruments inc.\" \/>\n<meta property=\"og:description\" content=\"A3000 Series Photohelic\u00ae A3000 Switches\/Pressure Gauges for pressure measurement up to 25 psig\" \/>\n<meta property=\"og:url\" content=\"https:\/\/chevrierinstruments.com\/en\/produit\/photohelic-differential-pressure-switches\/\" \/>\n<meta property=\"og:site_name\" content=\"Chevrier Instruments inc.\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-22T18:27:15+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/chevrierinstruments.com\/en\/produit\/photohelic-differential-pressure-switches\/\",\"url\":\"https:\/\/chevrierinstruments.com\/en\/produit\/photohelic-differential-pressure-switches\/\",\"name\":\"Photohelic differential pressure switches - 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