{"id":7928,"date":"2022-05-23T04:59:51","date_gmt":"2022-05-22T20:59:51","guid":{"rendered":"https:\/\/ancor.biz\/?post_type=product&#038;p=7928"},"modified":"2025-08-18T12:43:41","modified_gmt":"2025-08-18T04:43:41","slug":"dwyer-series-668-differential-pressure-transmitter","status":"publish","type":"product","link":"https:\/\/ancor.biz\/index.php\/product\/dwyer-series-668-differential-pressure-transmitter\/","title":{"rendered":"DWYER Series 668 Differential Pressure Transmitter"},"content":{"rendered":"<h1>Series 668 Differential Pressure Transmitter, Ranges from 0 to 100&#8243; w.c., Overpressure<\/h1>\n<h1>Protection to 10 psig, \u00b11% Accuracy<\/h1>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/ancor.biz\/index.php\/product-category\/brand\/dwyer-instruments-brand\/\">DWYER<\/a> Series 668 Differential Pressure Transmitter\u00a0is capable of measuring low pressures with a \u00b11% accuracy &#8211; ideally suited for proper building pressurization and air flow control. Transmitters can withstand up to 10 psig overpressure with no damage to the unit. Variable capacitance sensor design provides excellent sensitivity and long-term stability. DWYER Series 668 Differential Pressure Transmitter is compact, lightweight design makes installation simple and easy. Units also feature reverse-polarity protection.<\/p>\n<p>&nbsp;<\/p>\n<section id=\"features\" class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-4\" aria-expanded=\"true\" aria-hidden=\"false\">\n<h1 class=\"tab-heading\">Features<\/h1>\n<ul>\n<li>Good accuracy at low pressure ranges provides exceptional value for ensuring control and minimizing costly out of specification conditions<\/li>\n<li>High overpressure rating eliminates possible damage to unit reducing unnecessary service time<\/li>\n<\/ul>\n<\/section>\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: Air and non-conductive gases.<\/li>\n<li class=\"title\">Accuracy: \u00b11% FS (RSS), (includes non-linearity, hysteresis, and non-repeatability).<\/li>\n<li class=\"title\">Temperature Limits: Operating: 0 to 150\u00b0F (-18 to 65\u00b0C), Storage: -40 to 185\u00b0F (-40 to 85\u00b0C).<\/li>\n<li class=\"title\">Pressure Limits: 10 psig (0.69 bar).<\/li>\n<li class=\"title\">Compensated Temperature Range: 0 to 150\u00b0F (-18 to 65\u00b0C).<\/li>\n<li class=\"title\">Thermal Effects: 0.033% FS\/\u00b0F (0.18% FS\/\u00b0C).<\/li>\n<li class=\"title\">Supply Voltage: 12 to 30 VDC.<\/li>\n<li class=\"title\">Output: 4 to 20 mA, 2-wire.<\/li>\n<li class=\"title\">Zero and Span Adjustment: \u00b11 mA, non-interactive.<\/li>\n<li class=\"title\">Response Time: &lt;60 msec.<\/li>\n<li class=\"title\">Loop Resistance: 0 to 800 \u03a9.<\/li>\n<li class=\"title\">Electrical Connection: Terminal strip.<\/li>\n<li class=\"title\">Pressure Connection: 3\/16&#8243; OD fitting for 1\/4&#8243; ID tubing.<\/li>\n<li class=\"title\">Housing: Fire retardant glass filled polyester.<\/li>\n<li class=\"title\">Weight: 3 oz (85 g).<\/li>\n<li class=\"title\">Agency Approval: CE.<\/li>\n<\/ul>\n<\/section>\n<p>&nbsp;<\/p>\n<h2 class=\"tab-heading\">Models &amp; Ordering<\/h2>\n<p>&nbsp;<\/p>\n<h3>Standard Ranges<\/h3>\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=\"\">668-1<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-0.25&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-19<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-0.4&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-2<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-0.5&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-3<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-1.0&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-4<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-2.5&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-5<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-5.0&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-6<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-10&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-7<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-25&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-8<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-50&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-9<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, range 0-100&#8243; w.c.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>Bi-Directional Ranges<\/h3>\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=\"\">668-10<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b10.1&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-11<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b10.25&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-12<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b10.5&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-13<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b11&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-14<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b12.5&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-15<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b15&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-16<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b110&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-17<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b125&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-18<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range 0 to \u00b150&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668-20<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter, bi-directional, range -0.05 to .20&#8243; w.c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>Standard Ranges with Conduit Cover<\/h3>\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=\"\">668C-1<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-0.25&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-2<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-0.5&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-3<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-1.0&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-4<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-2.5&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-5<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-5.0&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-6<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-10&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-7<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-25&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-8<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-50&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-9<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0-100&#8243; w.c.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>Bi-Directional Ranges with Conduit Cover<\/h3>\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=\"\">668C-10<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b10.1&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-11<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b10.25&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-12<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b10.5&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-13<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b11&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-14<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b12.5&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-15<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b15&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-16<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b110&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-17<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b125&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-18<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit cover, range 0 to \u00b150&#8243; w.c.<\/td>\n<\/tr>\n<tr>\n<td class=\"model-number\" nowrap=\"nowrap\" width=\"\">668C-19<\/td>\n<td class=\"description\" width=\"\">Differential pressure transmitter with conduit housing, range 0 to 0.4&#8243; w.c.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Series 668 Differential Pressure Transmitter, Ranges from 0 to 100&#8243; w.c., Overpressure Protection to 10 psig, \u00b11% Accuracy &nbsp; DWYER Series 668 Differential Pressure Transmitter\u00a0is capable of measuring low pressures with a \u00b11% accuracy &#8211; ideally suited for proper building pressurization and air flow control. Transmitters can withstand up to 10 psig overpressure with no &#8230; <a title=\"DWYER Series 668 Differential Pressure Transmitter\" class=\"read-more\" href=\"https:\/\/ancor.biz\/index.php\/product\/dwyer-series-668-differential-pressure-transmitter\/\" aria-label=\"More on DWYER Series 668 Differential Pressure Transmitter\">Read more<\/a><\/p>\n","protected":false},"featured_media":7929,"template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":""},"class_list":["post-7928","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-brand","product_cat-differential-pressure","product_cat-dwyer-pressure-transmitter","product_cat-dwyer-instruments-dwyer-omega","product_cat-dwyer-instruments-brand","product_cat-dwyer-omega","product_cat-pressure-transmitter","product_cat-pressure-transmitter-dwyer-instruments-brand","product_cat-pressure-transmitter-dwyer-instruments-dwyer-omega","product_tag-668-1","product_tag-668-10","product_tag-668-11","product_tag-668-12","product_tag-668-13","product_tag-668-14","product_tag-668-15","product_tag-668-16","product_tag-668-17","product_tag-668-18","product_tag-668-19","product_tag-668-2","product_tag-668-20","product_tag-668-3","product_tag-668-4","product_tag-668-5","product_tag-668-6","product_tag-668-7","product_tag-668-8","product_tag-668-9","product_tag-668c-1","product_tag-668c-10","product_tag-668c-11","product_tag-668c-12","product_tag-668c-13","product_tag-668c-14","product_tag-668c-15","product_tag-668c-16","product_tag-668c-17","product_tag-668c-18","product_tag-668c-19","product_tag-668c-2","product_tag-668c-3","product_tag-668c-4","product_tag-668c-5","product_tag-668c-6","product_tag-668c-7","product_tag-668c-8","product_tag-668c-9","product_tag-dwyer-series-668","product_tag-dwyer-series-668-differential-pressure-transmitter","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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