HORIBA 9615S-10D Waterproof Integrated pH Electrode with Built-in Temperature Sensor

Overview

The HORIBA 9615S-10D is a high-reliability, refillable combination pH electrode engineered for continuous and intermittent measurement in demanding water quality monitoring applications. Designed according to electrochemical principles of potentiometric pH sensing, it employs a lead-free thick-film glass membrane that delivers stable Nernstian response across the full aqueous pH range (0–14) while maintaining low electrical resistance and minimized alkali error at high pH. Its integrated temperature sensor—factory-configured as either Pt1000 or NTC—enables real-time, two-point automatic temperature compensation (ATC), ensuring traceable accuracy under dynamic thermal conditions. The electrode’s fully waterproof, IP67-rated housing incorporates a robust three-in-one architecture (pH sensing element, reference junction, and temperature sensor) within a single cylindrical probe, eliminating inter-component drift and simplifying system integration in portable meters, inline process analyzers, and laboratory benchtop controllers.

Key Features

• Lead-free thick-film glass membrane compliant with RoHS and REACH directives, optimized for rapid response (<15 s to 95% stability in buffer solutions) and low drift (<0.01 pH/h typical)
• Integrated temperature sensor with ±0.2 °C accuracy over 0–100 °C, supporting ASTM D1293 and ISO 10523-compliant ATC algorithms
• Refillable design with dual-port electrolyte reservoir; compatible with HORIBA’s standardized 3.33 M KCl filling solutions (catalog nos. 525-3 and 300), enabling extended service life and consistent liquid junction potential
• Conical dome-shaped sensing tip minimizes mechanical stress and surface adhesion, reducing fouling in turbid or particulate-laden samples such as wastewater, surface water, and industrial effluents
• IP67-rated body constructed from chemically inert polypropylene and PEEK components, resistant to UV degradation, chlorine, and common disinfectants encountered in municipal and environmental monitoring
• BNC + phono (RCA) dual-output connector facilitates direct connection to HORIBA LAQUA twin-series meters, as well as third-party data loggers and SCADA systems supporting analog voltage input

Sample Compatibility & Compliance

The 9615S-10D demonstrates broad compatibility with aqueous matrices including drinking water, groundwater, seawater (with periodic cleaning), wastewater, cooling tower fluids, and calibration buffers (pH 4.01, 7.00, 10.01). It is not recommended for non-aqueous solvents, highly viscous oils, or strong hydrofluoric acid solutions. The electrode meets key regulatory and methodological requirements for environmental laboratories operating under EPA Method 150.1, ISO 10523:2022, and APHA Standard Methods 4500-H⁺ B. Its refillable construction supports GLP-compliant recordkeeping: users can document fill dates, electrolyte lot numbers, and calibration history per audit trail requirements. The absence of lead in the glass formulation aligns with EU Directive 2011/65/EU (RoHS 2) and supports sustainability reporting frameworks used by public utilities and certified environmental testing labs.

Software & Data Management

When paired with HORIBA LAQUAtouch or LAQUAwin software, the 9615S-10D enables automated calibration validation, drift trend logging, and electrode health diagnostics—including slope calculation (% recovery), asymmetry potential, and reference junction resistance estimation. All measurements are time-stamped and associated with operator ID, calibration certificate numbers, and environmental metadata (temperature, atmospheric pressure if logged externally). Data export complies with ASTM E2500-21 for instrument qualification documentation and supports FDA 21 CFR Part 11 compliance when deployed on validated Windows-based acquisition stations with electronic signature capability and audit-trail-enabling firmware.

Applications

• Regulatory compliance monitoring in municipal wastewater treatment plants (influent, bioreactor, final effluent)
• In-situ pH profiling in rivers, lakes, and estuaries using submersible probe housings and telemetry-enabled data buoys
• Quality control of potable water distribution systems and desalination plant permeate streams
• Process control in food & beverage production (e.g., dairy pasteurization, brewing mash pH stabilization)
• Educational and research laboratories requiring reproducible, maintenance-transparent pH metrology for method development and inter-laboratory comparison studies

FAQ

Is the 9615S-10D suitable for sterilization or autoclaving?
No—this electrode is not rated for steam sterilization. Autoclaving will damage the glass membrane, temperature sensor, and internal reference system. For hygienic applications, use chemical sanitization with 70% ethanol or diluted sodium hypochlorite (≤200 ppm), followed by thorough rinsing.
What is the recommended recalibration frequency in continuous monitoring mode?
For critical environmental applications, daily two-point calibration is advised. In stable, low-fouling environments (e.g., clean groundwater), verification against a single buffer every 8–12 hours suffices—provided slope remains ≥95% and offset stays within ±15 mV.
Can I replace the temperature sensor independently?
No—the temperature sensor is permanently embedded during manufacturing and cannot be serviced separately. Full electrode replacement is required if temperature compensation fails or deviates beyond specification.
Does the electrode require storage solution when not in use?
Yes. Store vertically in HORIBA Storage Solution (ref. 525-5) or 3.33 M KCl. Never store dry or in distilled water, as dehydration or osmotic shock will irreversibly degrade membrane performance.