Hanna HI98191 Waterproof Portable pH/ORP/ISE/Temperature Meter

Overview

The Hanna HI98191 is a high-precision, field-deployable multiparameter meter engineered for rigorous pH, oxidation-reduction potential (ORP), ion-selective electrode (ISE), and temperature measurements in demanding laboratory, industrial, and environmental applications. Utilizing potentiometric measurement principles compliant with ISO 3696, ASTM D1293, and USP , the instrument delivers traceable accuracy across an extended pH range of –2.000 to 20.000, enabling analysis of highly acidic, alkaline, or non-aqueous samples—such as battery electrolytes, semiconductor process baths, and aggressive cleaning formulations. Its dual-mode temperature compensation (automatic or manual, –20.0 to 120.0 °C) ensures thermodynamic consistency in kinetic or equilibrium-based assays. The integrated HI72911B electrode combines a low-resistance GP glass flat-tip sensor, PTFE-dialysis junction, and corrosion-resistant titanium body—designed specifically for surface, semi-solid, and viscous media where conventional bulb electrodes fail.

Key Features

• IP67-rated rugged housing with sealed membrane keypad and backlit graphical LCD—operable under rain, dust, or low-light field conditions.
• CAL Check™ diagnostic system: Compares real-time calibration slope, offset, and response time against historical reference values to flag electrode fouling, aging, or buffer degradation—supporting proactive maintenance and audit-ready documentation.
• GLP-compliant data management: Timestamped calibration records store date, time, buffer IDs, slope (%), and asymmetry potential (mV)—fully traceable per FDA 21 CFR Part 11 requirements when used with HI92000-15 software and audit trail enabled.
• Five-point automatic recognition pH calibration using NIST-traceable buffers (1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45); customizable calibration intervals with visual expiration alerts to enforce measurement integrity.
• ISE quantification across 15 preconfigured ions (e.g., F⁻, Cl⁻, NO₃⁻, NH₄⁺, Ca²⁺, Pb²⁺) with selectable units (ppm, mol/L, % w/v, µg/L, etc.) and valence-aware accuracy correction (±0.5% for monovalent, ±1% for divalent ions).
• Auto-endpoint locking algorithm stabilizes readings within ±0.001 pH or ±0.1 mV over 3 seconds—minimizing operator variability in routine QC workflows.

Sample Compatibility & Compliance

The HI98191 supports direct measurement of aqueous solutions, slurries, gels, food matrices, and industrial process streams. Its flat-tip HI72911B electrode eliminates air bubble entrapment and enables stable contact with uneven or particulate-laden surfaces—critical for pharmaceutical tablet dissolution testing (USP ) or wastewater sludge monitoring. All calibrations adhere to ISO/IEC 17025 metrological traceability guidelines when performed with certified reference materials. The instrument meets CE, RoHS, and WEEE directives; its IP67 rating complies with IEC 60529 for temporary immersion (1 m for 30 min), making it suitable for outdoor sampling, marine research, and cleanroom perimeter verification.

Software & Data Management

Data export is facilitated via USB interface using the HI92000-15 Windows-compatible software suite. This platform enables batch download of up to 300 stored measurements—including pH, mV, ISE concentration, temperature, and calibration metadata—with CSV or Excel export options. Audit trail functionality logs user ID, action timestamp, parameter changes, and calibration events—essential for GMP/GLP-regulated environments. Software-generated reports include statistical summaries (mean, SD, CV%), trend charts, and compliance flags for out-of-spec results—streamlining internal quality reviews and external regulatory submissions.

Applications

• Environmental monitoring: Field-based assessment of acid mine drainage (pH 14), and heavy metal speciation (e.g., Pb²⁺, Cd²⁺) in soil leachates.
• Pharmaceutical manufacturing: Final rinse water conductivity validation, buffer pH verification in bioreactor feed lines, and excipient ISE testing per ICH Q5C stability protocols.
• Food & beverage QA: Brine salinity (Cl⁻ ISE), dairy product titratable acidity (pH), and nitrate/nitrite levels in cured meats per USDA FSIS Directive 7120.1.
• Academic research: Teaching electrochemistry principles (Nernst equation validation), corrosion inhibitor efficacy studies (ORP kinetics), and polymer electrolyte characterization.
• Water treatment: Real-time disinfectant residual monitoring (free chlorine via ORP), fluoride compliance testing in municipal supplies (ISE), and boiler feedwater alkalinity control.

FAQ

What calibration standards are included in the instrument’s memory?
The HI98191 stores seven NIST-traceable pH buffer values (1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45) and six ISE standard concentrations (0.1, 1, 10, 100, 1000, 10000 ppm) for rapid setup without manual entry.
Does the HI98191 support Good Laboratory Practice (GLP) documentation requirements?
Yes—it retains full calibration history with timestamps, slope/offset values, and buffer IDs. When paired with HI92000-15 software and configured for audit trail logging, it satisfies FDA 21 CFR Part 11 electronic record requirements.
Can the HI72911B electrode be used for non-aqueous samples?
It is optimized for aqueous and semi-aqueous systems. For solvents like ethanol or acetone, use the HI1131B glass-body electrode with appropriate liquid junction and hydration protocol.
How does CAL Check™ improve measurement reliability?
By cross-referencing current calibration diagnostics (e.g., slope drift >5%/day or asymmetry shift >30 mV) against baseline performance, it identifies early-stage electrode failure—reducing risk of false acceptance in release testing.
Is temperature compensation mandatory during ISE measurements?
While not required for all ISE applications, automatic temperature compensation (ATC) is recommended for quantitative analysis, as Nernstian response is temperature-dependent; the HI72911B’s integrated sensor ensures synchronized thermal correction.