{"id":7723,"date":"2022-05-19T03:36:55","date_gmt":"2022-05-18T19:36:55","guid":{"rendered":"https:\/\/ancor.biz\/?post_type=product&#038;p=7723"},"modified":"2025-08-18T12:05:53","modified_gmt":"2025-08-18T04:05:53","slug":"dwyer-series-a4-differential-pressure-switch","status":"publish","type":"product","link":"https:\/\/ancor.biz\/index.php\/product\/dwyer-series-a4-differential-pressure-switch\/","title":{"rendered":"DWYER Series A4 Differential Pressure Switch"},"content":{"rendered":"<h1>Series A4 Differential Pressure Switch, Adjustable Set Point, High Overpressure<\/h1>\n<p>&nbsp;<\/p>\n<p>Rugged\u00a0<a href=\"https:\/\/ancor.biz\/index.php\/product-category\/brand\/dwyer-instruments-brand\/\">DWYER<\/a> Series A4 Differential Pressure Switch offers field adjustments and can handle system pressures up to 6000 psig. Piston design allows mounting in any orientation. The DWYER <a href=\"https:\/\/intl.dwyer-inst.com\/Product\/Pressure\/DifferentialPressure\/Switches\/SeriesA4?Query=A4\">Series A4<\/a> Differential Pressure Switch is capable of carrying moderate shock and vibratory loads.<\/p>\n<p>&nbsp;<\/p>\n<section id=\"specs\" class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-3\" aria-expanded=\"true\" aria-hidden=\"false\">\n<h1 class=\"tab-heading\">Specifications<\/h1>\n<ul class=\"list-specs lined\">\n<li>Service: Compatible gases.<\/li>\n<li class=\"title\">Wetted Materials: Body, piston, and fittings: anodized aluminum; spring: steel.<\/li>\n<li class=\"title\">Temperature Limits: -65 to 225\u00b0F (-54 to 107\u00b0C).<\/li>\n<li class=\"title\">Pressure Limits: 2000 psid (138 bar).<\/li>\n<li class=\"title\">Repeatability: See Ordering page.<\/li>\n<li class=\"title\">Switch Type: SPDT.<\/li>\n<li class=\"title\">Electrical Rating: AC: 3 VA, 0.25A @ 120 VAC; 5 VA, 0.25A @ 175 VDC.<\/li>\n<li class=\"title\">Electrical Connection: 24 AWG X 12&#8243; (30.5 cm) wire leads.<\/li>\n<li class=\"title\">Process Connection: 1\/4&#8243; female NPT.<\/li>\n<li class=\"title\">Mounting Orientation: Any.<\/li>\n<li class=\"title\">Set Point Adjustment: See Ordering page.<\/li>\n<li class=\"title\">Weight: 8.5 oz (241 g).<\/li>\n<li class=\"title\">Agency Approvals: CE.<\/li>\n<\/ul>\n<\/section>\n<p>&nbsp;<\/p>\n<h2 class=\"tab-heading\">Models &amp; Ordering<\/h2>\n<form id=\"FilterModels\" action=\"#ordering\" method=\"POST\" name=\"FilterModels\" data-hs-cf-bound=\"true\">\n<div class=\"grid\">\n<div class=\"models-list column col-4of4\"><\/div>\n<\/div>\n<\/form>\n<table class=\"product-table\">\n<tbody>\n<tr>\n<th class=\"model-number\" nowrap=\"nowrap\" width=\"\">Model<\/th>\n<th class=\"description\" width=\"\">Description<\/th>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">A4-1<\/td>\n<td class=\"description\" width=\"\">Differential pressure switch, \u00b12 psi (.14 bar) repeatability, set point (increasing) 7-13 psid (.48-.89 bar), set point (decreasing) 2-7 psid (.14-.48 bar).<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">A4-2<\/td>\n<td class=\"description\" width=\"\">Differential pressure switch, \u00b14 psi (.28 bar) repeatability, set point (increasing) 13-25 psid (.89-1.7 bar), set point (decreasing) 5-16 psid (.34-1.1 bar).<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">A4-3<\/td>\n<td class=\"description\" width=\"\">Differential pressure switch, \u00b18 psi (.55 bar) repeatability, set point (increasing) 25-45 psid (1.7-3.1 bar), set point (decreasing) 10-21 psid (.68-1.5 bar).<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">A4-4<\/td>\n<td class=\"description\" width=\"\">Differential pressure switch, \u00b116 psi (1.1 bar) repeatability, set point (increasing) 35-160 psid (2.4-11.0 bar), set point (decreasing) 20-80 psid (1.4-5.5 bar).<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">A4-5<\/td>\n<td class=\"description\" width=\"\">Differential pressure switch, \u00b132 psi (2.2 bar) repeatability, set point (increasing) 120-250 psid (8.3-17.2 bar), set point (decreasing) 35-120 psid (2.4-8.3 bar).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Series A4 Differential Pressure Switch, Adjustable Set Point, High Overpressure &nbsp; Rugged\u00a0DWYER Series A4 Differential Pressure Switch offers field adjustments and can handle system pressures up to 6000 psig. Piston design allows mounting in any orientation. The DWYER Series A4 Differential Pressure Switch is capable of carrying moderate shock and vibratory loads. &nbsp; Specifications Service: &#8230; <a title=\"DWYER Series A4 Differential Pressure Switch\" class=\"read-more\" href=\"https:\/\/ancor.biz\/index.php\/product\/dwyer-series-a4-differential-pressure-switch\/\" aria-label=\"More on DWYER Series A4 Differential Pressure Switch\">Read more<\/a><\/p>\n","protected":false},"featured_media":7724,"template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":""},"class_list":["post-7723","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-brand","product_cat-diffrential-pressure","product_cat-dwyer-switch-vacuum","product_cat-dwyer-instruments-brand","product_cat-dwyer-instruments-dwyer-omega","product_cat-dwyer-omega","product_cat-pressure-switch-dwyer-instruments-dwyer-omega","product_cat-switch-vacuum","product_cat-pressure-switch","product_cat-switch","product_tag-a4-1","product_tag-a4-2","product_tag-a4-3","product_tag-a4-4","product_tag-a4-5","product_tag-dwyer-series-a4","product_tag-dwyer-series-a4-differential-pressure-switch","sales-flash-overlay","woocommerce-text-align-center","woocommerce-image-align-center","do-quantity-buttons"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.3 - 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