{"product_id":"sc25v-alp25-120-yokogawa-combined-12mm-ph-electrode-with-variopin","title":"SC25V-ALP25-120 Yokogawa Combined 12mm pH Electrode with Variopin","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eYokogawa SC25V-ALP25-120\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003erepresents the pinnacle of liquid analysis technology, integrating four discrete sensing elements into a single, robust 12mm body. This combined electrode captures pH levels, reference potentials, and temperature via an onboard\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePt1000\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eRTD, while the integrated\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTitanium liquid earth\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eeliminates measurement drift caused by stray ground currents. Engineered specifically for harsh industrial processes, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSC25V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eexcels in high-temperature environments and chemically aggressive media where standard sensors fail. Its specialized\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAR-Glass\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePEEK\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econstruction provide a durable barrier against corrosion, ensuring precise analytical data for critical applications like cooling tower water management, chemical dosing, and wastewater treatment. By delivering a stable, low-impedance signal through its\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eVariopin\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econnector, this sensor enables real-time monitoring of fluid chemistry with laboratory-grade accuracy in a field-hardened format.\u003c\/p\u003e\n\u003ch2\u003eTechnical Configuration\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSC25V-ALP25-120\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emodel string defines a specific set of hardware characteristics optimized for specialized process conditions and safety requirements.\u003c\/p\u003e\n\u003ch3\u003eModel Suffix Analysis: SC25V-ALP25-120\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSC25V\u003c\/strong\u003e: This identifies the 12mm combined sensor series equipped with the standard\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eVariopin (VP)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewaterproof connector, ensuring secure signal transmission in humid or wash-down environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eALP25\u003c\/strong\u003e: This code designates the specialized\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e\"Alkali Resistant\"\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eglass type. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eALP25\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esensor chemistry withstands high-temperature operation and resists chemical erosion in processes with high pH values or high salt concentrations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e120\u003c\/strong\u003e: Specifies the immersion length of the sensor body. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e120 mm\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003elength follows the standard laboratory and industrial DIN mounting dimensions, making it compatible with a wide range of retractable or flow-through fittings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIntrinsically Safe (IS)\u003c\/strong\u003e: The module carries global certifications including\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eATEX, IECEx, and FM\u003c\/strong\u003e, allowing for safe deployment in Zone 0 or Class I, Division 1 hazardous areas.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eYokogawa\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSC25V-ALP25-120\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSensor Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCombined pH, Reference, Temp, \u0026amp; Liquid Earth\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTemperature Sensor\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePt1000\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eLiquid Earth Material\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTitanium\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBody Material\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePEEK \/ AR-Glass\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eO-Rings\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eViton (backed with EPDM)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eReference Junction\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePorous PTFE\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eConnector Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eVariopin (VP6)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSensor Length\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e120 mm\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1.0 kg\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eEngineering Advantages\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSC25V-ALP25-120\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ethrives in extreme process conditions where electrolytic depletion usually limits sensor life. Its\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePTFE reference junction\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides a large surface area that resists fouling and clogging, maintaining a stable junction potential even in oily or high-solid fluids. The use of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePEEK\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor the sensor head provides mechanical strength far superior to standard plastic sensors, protecting the internal electronics from physical stress.\u003c\/p\u003e\n\u003cp\u003eFurthermore, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTitanium liquid earth\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a shield against process noise. In modern plants with variable frequency drives (VFDs) and heavy electrical loads, stray voltages often cause pH readings to fluctuate. This electrode drains those currents to ground, ensuring that the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCENTUM VP\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eor standalone transmitter receives a pure, noise-free analytical signal. This makes it a vital component for high-reliability loops in the pharmaceutical and petrochemical industries.\u003c\/p\u003e\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003cp\u003eCorrect mechanical installation and electrical grounding guarantee the long-term accuracy of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSC25V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esensor.\u003c\/p\u003e\n\u003ch3\u003eMounting Orientation\u003c\/h3\u003e\n\u003cp\u003eInstall the sensor at an angle of at least 15° above the horizontal plane. This orientation ensures that the internal electrolyte remains in contact with the pH glass bulb and prevents air bubbles from trapping in the reference chamber.\u003c\/p\u003e\n\u003ch3\u003eVariopin Connection\u003c\/h3\u003e\n\u003cp\u003eEnsure the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eVariopin\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econnector is completely dry before mating the cable. While the VP connector provides an IP68-rated seal, moisture trapped inside the pins during installation will cause high-impedance leakage, leading to significant measurement drift.\u003c\/p\u003e\n\u003ch3\u003eStorage and Conditioning\u003c\/h3\u003e\n\u003cp\u003eNever allow the pH bulb to dry out. If the sensor is removed from the process for maintenance, store it in a 3.3M KCl solution. For first-time installation, soak the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eALP25\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eglass in a buffer solution for at least 24 hours to fully hydrate the measuring membrane.\u003c\/p\u003e\n\u003ch2\u003eTechnical FAQs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: What makes the ALP25 glass different from standard pH glass?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA1: The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eALP25\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eglass is specifically formulated to resist \"alkaline error\" at high pH levels and maintains its structural integrity at temperatures up to 130°C, where standard glass would quickly dissolve or lose sensitivity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: Does this sensor support digital communication like SENCOM?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA2: No, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSC25V-ALP25-120\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis an analog sensor. It outputs a millivolt signal for pH and a resistance signal for temperature, making it compatible with any standard high-impedance pH transmitter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: How often should I calibrate the SC25V-ALP25-120?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA3: Calibration frequency depends on the process aggressiveness. For high-temperature chemical applications, we recommend a two-point buffer calibration weekly to compensate for natural sensor aging and glass impedance changes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4: Can this electrode be used in hazardous areas?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA4: Yes. This module is certified for use in intrinsically safe (IS) environments when used with an approved Yokogawa barrier or transmitter, meeting\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eATEX\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eIECEx\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003estandards.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":45898005774509,"sku":"SC25V-ALP25-120","price":1999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/yokogawa_sc25v-alp25-120_1.jpg?v=1775705606","url":"https:\/\/www.maxwellplc.com\/products\/sc25v-alp25-120-yokogawa-combined-12mm-ph-electrode-with-variopin","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}