{"product_id":"yokogawa-sc25v-alp25-120-sc25v-combined-ph-sensor-electrode","title":"Yokogawa SC25V-ALP25-120 SC25V Combined pH Sensor Electrode","description":"\u003ch2\u003eYokogawa SC25V-ALP25-120 Combined pH Electrode\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa SC25V-ALP25-120\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eSC25V\u003c\/strong\u003e Combined pH Electrode, operates as a dedicated hardware component for electrochemical pH potential measurement and integral temperature sensing within process control analytical loops. The assembly transmits analog potential signals and RTD resistance across industrial wet-process lines to evaluate process chemistry in real time.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSC25V\u003c\/strong\u003e: Base model specifying a combined 12 mm process sensor equipped with pH glass electrode, reference system, titanium liquid earth, Pt1000 temperature element, and a Variopin connector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eALP25\u003c\/strong\u003e: High-temperature and chemical-resistant sensor variant supporting analog output with intrinsic safety (IS) approvals for ATEX, IECEx, FM-US, and FM-CAN.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e120\u003c\/strong\u003e: Insertion shaft length specifying 120 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSC25V-ALP25-120\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.26 kg (Shipping Weight: 1 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e300 x 100 x 75 mm (Package Dimensions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e15 to 130 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive sensor element (External loop powered via transmitter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Diameter\u003c\/td\u003e\n\u003ctd\u003e12 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Length\u003c\/td\u003e\n\u003ctd\u003e120 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eVariopin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003ePEEK and AR-Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasuring Glass\u003c\/td\u003e\n\u003ctd\u003eGlass (Type G or L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference System\u003c\/td\u003e\n\u003ctd\u003eSilver \/ Silver Chloride (Ag\/AgCl)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference Junction\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLiquid Earth Pin\u003c\/td\u003e\n\u003ctd\u003eTitanium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Temperature Sensor\u003c\/td\u003e\n\u003ctd\u003ePt1000 RTD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eO-Ring Seals\u003c\/td\u003e\n\u003ctd\u003eViton (backed up with EPDM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Measurement Range\u003c\/td\u003e\n\u003ctd\u003e0 to 14 pH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Range\u003c\/td\u003e\n\u003ctd\u003e0 to 10 bar (0 to 142 psig)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Impedance\u003c\/td\u003e\n\u003ctd\u003eNominal 700 Mohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIngress Protection\u003c\/td\u003e\n\u003ctd\u003eIP67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIn-Situ Sterilization\u003c\/td\u003e\n\u003ctd\u003eUp to 135 deg C (CIP \/ SIP compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHazardous Area Approvals\u003c\/td\u003e\n\u003ctd\u003eATEX, IECEx, FM-US, FM-CAN (Intrinsically Safe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation \u0026amp; Cold Junction Compensation\u003c\/h3\u003e\n\u003cp\u003eThe analog glass potential and reference signals operate in conjunction with an integrated titanium liquid earth pin that grounds the process fluid directly at the sensor tip. This physical grounding pathway eliminates stray ground loop currents through field piping, stabilizing the high-impedance (700 Mohm) pH glass signal before conditioning at the analyzer transmitter input stage. High galvanic isolation within the downstream transmitter isolates the dual-element potential from plant ground potentials, while the embedded Pt1000 RTD continuously delivers precise thermal data for dynamic temperature compensation algorithms, preventing thermal drift across fluctuating process temperatures.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the titanium liquid earth pin prevent measurement drift in grounded stainless steel piping?\u003c\/p\u003e\n\u003cp\u003eA: The titanium pin provides a direct, corrosion-resistant electrical connection between the process fluid and the analyzer's reference shielding circuit. This arrangement shunts stray electrical currents away from the high-impedance Ag\/AgCl reference junction, keeping the reference potential stable during severe ground potential offsets.\u003c\/p\u003e\n\u003cp\u003eQ: What precautions must technicians observe regarding the Variopin connector during field installation?\u003c\/p\u003e\n\u003cp\u003eA: Installers must verify that the Variopin connector remains completely dry and uncontaminated by process fluid or moisture during landing. Because the pH measuring circuit operates at extremely high electrical impedance (nominal 700 Mohm), any moisture or chemical residue inside the connector socket creates parallel resistance paths that severely degrade measurement accuracy.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the SC25V-ALP25-120 electrode into compatible 12 mm armored fittings or flow cells using standard thread engagement protocols. Inspect the Viton and EPDM backup O-rings prior to insertion to ensure tight sealing against process pressures up to 10 bar. Route the Variopin high-impedance signal cable through dedicated, shielded conduits away from high-voltage motor wiring or variable frequency drives to prevent electromagnetic noise pickup. Land the cable shield braid firmly at the designated analyzer earth terminal. When commissioning, remove the protective wetting cap and soak the glass bulb in standard pH calibration buffer solutions prior to executing two-point calibration routines.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43832029904986,"sku":"SC25V-ALP25-120","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/14_aef8e330-9d89-4912-a41d-ce77f84bc877.jpg?v=1786505047","url":"https:\/\/www.spareoil.com\/products\/yokogawa-sc25v-alp25-120-sc25v-combined-ph-sensor-electrode","provider":"SpareOil Automation","version":"1.0","type":"link"}