Horiba ORP & Temperature Electrode

Replacement ORP (oxidation-reduction potential) and temperature electrodes for HORIBA meters. ORP is measured in millivolts against a reference and tells you whether a solution is oxidizing or reducing — the single most useful indicator for disinfection control, chemical dosing and treatment endpoint detection. ORP electrodes 9300-10D (3014046710) — waterproof combination ORP electrode. 9301-10D (3200922105) — waterproof combination ORP electrode, black body. Both combine the platinum sensing surface and the reference in one waterproof body, so they connect directly to a compatible meter without a separate reference electrode. Temperature electrode 4163-10T (3014080375) — temperature electrode, for meters that need a separate temperature input for automatic compensation when the pH or conductivity electrode has no built-in sensor. Why ORP is worth measuring In chlorination, ORP reflects the actual disinfecting power of the water rather than the total chlorine present, which is why it is used to control dosing in drinking water, pools and cooling systems. In wastewater it distinguishes aerobic from anoxic and anaerobic conditions, so it is used to verify that nitrification, denitrification and sulfide control are working. In metal finishing it is the standard endpoint indicator for cyanide destruction and chromium reduction. Applications Drinking water and pool disinfection control Wastewater treatment: aeration, denitrification and sulfide control Cyanide destruction and hexavalent chromium reduction in metal finishing Cooling tower and process water oxidant dosing Redox titrations and laboratory ORP measurement Groundwater redox characterization at contaminated sites Aquaculture and hydroponics water quality monitoring Maintenance note A sluggish or non-responsive ORP electrode is usually a fouled platinum surface rather than a failed electrode. Cleaning the platinum restores response in most cases; verify against a known redox standard before replacing the electrode. Documentation HORIBA water quality document library — electrode brochures and manuals Related items ORP standard solutions, electrode storage caps, filling solutions and electrode stands are in the Horiba Parts & Accessories collection. Browse all HORIBA instruments.