{"id":44640,"date":"2024-04-02T22:36:15","date_gmt":"2024-04-02T12:06:15","guid":{"rendered":"https:\/\/onetemp.c2szky.ap-southeast-2.wpstaqhosting.com\/product\/phionics-sts-ph-sensor-with-4-20ma-output\/"},"modified":"2026-10-14T01:04:13","modified_gmt":"2026-10-13T14:34:13","slug":"phionics-sts-ph-sensor-with-4-20ma-output","status":"publish","type":"product","link":"https:\/\/www.onetemp.com.au\/nz\/product\/phionics-sts-ph-sensor-with-4-20ma-output\/","title":{"rendered":"pHionics STs &#8211; pH Sensor with 4-20mA output"},"content":{"rendered":"<p>The pHionics STs Series\u2122 pH sensor provides accurate pH and temperature measurements to a datalogger or RTU for continuous water quality monitoring. A large, double junction reference cell provides accurate, stable pH measurements for long periods of time. In addition, isolation, differential amplification, and shielding eliminate background noise without draining the battery of the datalogger or RTU.<\/p>\n<p>The STs Series goes where other sensors cannot with a 0.75\u2033 (19mm) diameter while a durable, chemical-resistant housing ensures many years in-use.<\/p>\n<p>All parts, including the cable, are easily replaceable without tools using\u202fpHionics\u202fpatented\u202fpHiConn\u2122 System, saving frustration and money.<\/p>\n<p>These features make our pH sensor well-suited for applications such as groundwater monitoring, wastewater treatment, aquaculture, pollution control, and many others.<\/p>\n<h3>Highlighted Features<\/h3>\n<ul style=\"list-style-type: disc;\">\n<li>Accurate double-junction electrode measuring 0 to 14 pH<\/li>\n<li>Large reference half-cell to reduce calibration frequency<\/li>\n<li>Secondary 0-50\u00b0C temperature sensor<\/li>\n<li>2-wire, 4-20 mA analog outputs compatible with wide range of dataloggers or remote telemetry units (RTU)<\/li>\n<li>Narrow diameter (0.75 inches or 1.9 cm) for groundwater or in-line mounting applications<\/li>\n<li>Low power usage<\/li>\n<\/ul>\n<h3>Ranges available:<\/h3>\n<ul style=\"list-style-type: disc;\">\n<li>0-14 pH<\/li>\n<\/ul>\n<h3>Low Maintenance<\/h3>\n<p>The weak point of pH sensors is their reference solution, which gets diluted by the sample over time.\u202f STs Series pH sensors mitigate this problem by incorporating a reference half cell with a large reservoir.\u202f The high volume, combined with a low-flow reference gel and double-junction, reduces the dilution rate to provide a more stable reference.<\/p>\n<h3>Full Features List<\/h3>\n<ul style=\"list-style-type: disc;\">\n<li>Combination double-junction electrode with large reference reservoir<\/li>\n<li>Secondary 0-50\u00b0C temperature sensor<\/li>\n<li>Chemical-resistant Delrin\u00ae, PVDF,\u202fand 316 Stainless Steel housing (Titanium optional)<\/li>\n<li>Metal housing acts as the solution ground, removing background noise caused by stray electrical currents<\/li>\n<li>Narrow diameter (0.75 inches or 1.9 cm)<\/li>\n<li>Removable electrode guard to protect from damage while allowing access to electrode for cleaning<\/li>\n<li>Fully submersible up to 70 psi<\/li>\n<li>Shielded, Kevlar\u00ae-reinforced, water-blocked polyurethane cable<\/li>\n<li>4-20 mA signal capable of transmission up to 3 miles (with proper wire gauge)<\/li>\n<li>Automatic Temperature Compensation (2% per degree Celsius)<\/li>\n<li>Reversible Input Protection and Operation<\/li>\n<li>2-second warm-up time to avoid battery drain of datalogger or RTU<\/li>\n<li>Low power usage for long-term water quality monitoring<\/li>\n<li>Isolated to prevent ground loops<\/li>\n<li>Signal conditioning to remove background noise<\/li>\n<\/ul>\n<h3>Accurate Measurements<\/h3>\n<h3>Application List<\/h3>\n<ul style=\"list-style-type: disc;\">\n<li>Groundwater Monitoring<\/li>\n<li>Agricultural Runoff<\/li>\n<li>Mining Pollution<\/li>\n<li>Industrial Effluent Monitoring<\/li>\n<li>Wastewater Treatment<\/li>\n<li>Ballast Monitoring<\/li>\n<li>Environmental Remediation<\/li>\n<li>Aquaculture<\/li>\n<\/ul>\n<h3><\/h3>","protected":false},"excerpt":{"rendered":"<p>The pHionics STs Series\u2122 pH sensor provides accurate pH and temperature measurements from 0-14pH to a datalogger or RTU for continuous water quality monitoring.<\/p>\n<p data-pm-slice=\"1 1 []\"><strong>Available in 7.62m standard cable length (25\u2032) \u2013 custom cable lengths available on request.\u00a0<\/strong><\/p>","protected":false},"featured_media":32392,"template":"","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"inline_featured_image":false,"_exactmetrics_skip_tracking":false,"_monsterinsights_skip_tracking":false},"product_brand":[],"product_cat":[15],"product_tag":[],"application":[363,364,516],"connectivity-output":[66],"environment":[88],"instrument-type":[213,228,229],"manufacturer":[242],"measurement-input":[145],"class_list":["post-44640","product","type-product","status-publish","has-post-thumbnail","product_cat-products","application-water-quality","application-water-analysis","application-controllers-transmitters","connectivity-output-4-20ma","environment-underwater-monitoring","instrument-type-sensors","instrument-type-transmitters","instrument-type-2-wire-loop-powered","manufacturer-phionics","measurement-input-ph","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"composite_virtual":false,"composite_layout":"","composite_add_to_cart_form_location":"","composite_editable_in_cart":false,"composite_sold_individually_context":"","composite_shop_price_calc":"","composite_components":[],"composite_scenarios":[],"bundled_by":["45017","45212"],"bundle_stock_status":"instock","bundle_stock_quantity":null,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[],"bundle_sells_title":"","bundle_sells_discount":"","acf":[],"yoast_head":"<!-- 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Available in 7.62m standard cable length (25\u2032) \u2013 custom cable lengths available on request.\u00a0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.onetemp.com.au\/nz\/product\/phionics-sts-ph-sensor-with-4-20ma-output\/\" \/>\n<meta property=\"og:site_name\" content=\"OneTemp\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/OneTempAust\/\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-13T14:34:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.onetemp.com.au\/wp-content\/uploads\/2026\/10\/STs-pH-Sensor-w_-4_20mA-Output-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"900\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\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<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"pHionics STs - pH Sensor with 4-20mA output - OneTemp","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.onetemp.com.au\/nz\/product\/phionics-sts-ph-sensor-with-4-20ma-output\/","og_locale":"en_US","og_type":"article","og_title":"pHionics STs - pH Sensor with 4-20mA output - OneTemp","og_description":"The pHionics STs Series\u2122 pH sensor provides accurate pH and temperature measurements from 0-14pH to a datalogger or RTU for continuous water quality monitoring. 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