{"product_id":"honeywell-51451326-503-ph-probe-sensor","title":"Honeywell 51451326-503 PH Probe Sensor","description":"\u003ch2\u003eHoneywell 51451326-503 PH Probe Sensor\u003c\/h2\u003e\n\u003cp\u003eConfigured for liquid‑phase pH measurement in process loops, the \u003cstrong\u003eHoneywell 51451326-503\u003c\/strong\u003e (\u003cstrong\u003eMeredian II\u003c\/strong\u003e pH probe) provides direct electrochemical sensing through a combination glass electrode assembly. The probe uses integral tinned‑lead cabling for signal continuity and supports immersion or in‑line mounting across UCN‑connected measurement paths.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003e51451326-503\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temp\u003c\/th\u003e\n\u003ctd\u003e32 deg F to 212 deg F (0 deg C to 100 deg C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Consumption\u003c\/th\u003e\n\u003ctd\u003ePassive electrochemical sensor; no active draw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCore Performance Indicators\u003c\/th\u003e\n\u003ctd\u003eMeredian II combination pH electrode with 20 ft (6.10 m) integral cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol Behavior\u003c\/h3\u003e\n\u003cp\u003eAlthough the probe itself outputs a raw millivolt signal, it is typically paired with Honeywell transmitters that convert the electrode potential into a 4-20 mA HART loop. Stable electrode impedance ensures predictable loop scaling, minimizing drift during temperature compensation cycles. Channel‑to‑channel isolation in associated transmitters prevents cross‑talk when multiple probes share the same enclosure or manifold.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 51451326-503 be installed in a pressurized in‑line holder? A: Yes, provided the holder is rated for the process pressure and maintains proper sealing around the probe body.\u003c\/p\u003e\n\u003cp\u003eQ: Does the probe require polarization time after installation? A: Combination pH electrodes typically stabilize within minutes, but final calibration should be performed after thermal equilibrium is reached.\u003c\/p\u003e\n\u003cp\u003eQ: Can the integral cable be extended? A: Extension is possible only with high‑impedance pH‑rated cable. Standard signal cable may introduce noise or offset errors.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the probe in a location with continuous wetting of the sensing tip.\u003c\/li\u003e\n\u003cli\u003eAvoid routing the cable parallel to high‑voltage conductors to reduce induced noise.\u003c\/li\u003e\n\u003cli\u003eMaintain immersion depth sufficient to cover the reference junction.\u003c\/li\u003e\n\u003cli\u003eUse proper grounding practices on associated transmitters to prevent measurement offset.\u003c\/li\u003e\n\u003cli\u003eRinse the electrode with clean water before insertion to avoid contamination.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":48361350561982,"sku":"51451326-503","price":560.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-07-13_15-56-40_e04d786e-bb05-465b-85c4-8bdd88ef2a51.png?v=1783935543","url":"https:\/\/www.autooiltech.com\/products\/honeywell-51451326-503-ph-probe-sensor","provider":"AutoOilTech Limited","version":"1.0","type":"link"}