Hanna Instruments HI98185 Portable Professional pH/ORP/ISE/Temperature Meter

Overview

The Hanna Instruments HI98185 is a high-precision, IP67-rated portable meter engineered for field-deployable and laboratory-grade water quality analysis. It employs potentiometric measurement principles—based on Nernst equation response—to quantify hydrogen ion activity (pH), redox potential (ORP), ion activity via ion-selective electrodes (ISE), and temperature in aqueous matrices. Designed for rigorous environmental monitoring, wastewater treatment, aquaculture, and industrial process control, the HI98185 integrates electrochemical sensing with embedded thermal compensation and real-time diagnostics. Its robust polycarbonate housing, ergonomic non-slip grip, and sealed keypad ensure operational reliability under harsh outdoor conditions—including rain, dust, and temporary submersion. The instrument meets international design expectations for portable analytical instrumentation used in EPA-compliant sampling protocols and ISO/IEC 17025-accredited laboratories.

Key Features

• Backlit 128×64 dot-matrix LCD display with intuitive icon-driven interface and multi-parameter real-time readout (pH/ORP/ISE value, unit, temperature, time stamp, battery status, electrode type)
• Inductive charging system: eliminates battery compartment exposure; supports AC adapter or 12 V DC vehicle power input; full charge enables up to 200 hours of continuous operation
• Advanced GLP functionality: automatic timestamping of calibrations, electrode condition diagnostics (slope %, offset, response time), contamination alerts for calibration buffers, and out-of-range calibration warnings
• Auto-endpoint detection with configurable hold time; selectable resolution (0.001 pH, 0.1 mV, variable ISE digits) and user-defined auto-shutdown (5/10/30/60 min or disabled)
• High-input-impedance circuitry (>10¹² Ω) ensures stable readings with low-current pH and ISE electrodes, minimizing signal drift in low-conductivity samples (e.g., ultrapure water, rainwater)
• Comprehensive calibration management: pH auto-5-point with seven factory-stored buffers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45) plus five user-defined points; ISE up to 5-point calibration using six standard concentrations (0.1–10,000 ppm)

Sample Compatibility & Compliance

The HI98185 is validated for use with a broad spectrum of aqueous environmental and process samples—including surface water, groundwater, effluent, drinking water, cooling tower fluids, hydroponic nutrient solutions, and brackish estuarine systems. Its compatibility extends to low-ionic-strength matrices when paired with specialized electrodes (e.g., HI1200B or HI1300B low-conductivity pH probes). The instrument adheres to key regulatory frameworks governing field instrumentation: it supports audit-ready GLP data logging per ISO/IEC 17025 requirements, and its calibration traceability aligns with NIST-traceable buffer standards. While not FDA 21 CFR Part 11–certified as a standalone device, its HI92000 PC software (optional) enables secure data export with electronic signatures and audit trails suitable for GMP-aligned QA/QC workflows.

Software & Data Management

Data acquisition and reporting are facilitated via USB connectivity to Windows-based PCs using the optional HI92000 Windows software. This application enables bidirectional communication: downloading stored measurements (200 records with date/time stamps), exporting CSV or PDF reports, reviewing calibration history with slope/offset metrics, and configuring instrument settings remotely. All logged entries include metadata critical for method validation—electrode ID (if encoded), calibration buffer IDs, ambient temperature, and operator notes. The software supports batch export for LIMS integration and generates compliance-ready summaries compliant with ASTM D1293 (pH of water) and ASTM D3222 (ORP measurement in natural waters).

Applications

• Regulatory field monitoring: EPA Method 150.1 (pH), Method 150.2 (ORP), and site-specific ISE methods for nitrate, fluoride, ammonia, or heavy metals in ambient water bodies
• Wastewater treatment: real-time tracking of nitrification/denitrification redox transitions, lime softening pH endpoints, and chloride monitoring in membrane filtration feed streams
• Aquaculture and hydroponics: precision control of pH and nutrient ion activity (e.g., K⁺, NO₃⁻) to optimize bioavailability and prevent toxicity
• Industrial hygiene: corrosion potential assessment in cooling water systems via ORP trending, and boiler feedwater pH verification per ASME PTC 19.11
• Educational laboratories: teaching electrochemical fundamentals including Nernstian behavior, junction potential effects, and temperature compensation theory

FAQ

What electrode types are compatible with the HI98185 for low-conductivity water measurements?
The HI98185 supports Hanna’s HI1200B and HI1300B low-conductivity pH/temperature combination electrodes, both featuring double-junction reference systems and optimized liquid junctions to minimize electrolyte leakage and junction potential errors.
Does the HI98185 support automatic temperature compensation during ISE measurements?
Yes—ATC is applied continuously during ISE mode using either the integrated temperature sensor in the HI72911B probe or an external HI7662 temperature probe, ensuring accurate Nernst slope correction across the full -20.0 to 120.0 °C range.
Can calibration data be exported for third-party audit review?
Calibration events—including date/time, buffer IDs, measured mV/pH values, slope (%), and offset (mV)—are stored internally and fully exportable via HI92000 software with uneditable timestamps, satisfying internal QA and external accreditation body requirements.
Is the inductive charger compatible with international voltage standards?
The included AC adapter accepts 100–240 V AC, 50/60 Hz input; the inductive base station itself operates at low-voltage DC, making it universally deployable without voltage converters.
How does the HI98185 handle electrode diagnostics during routine use?
The instrument performs real-time evaluation of electrode health: calculating slope deviation from theoretical Nernst response, detecting abnormal offset shifts, flagging slow response times (>15 s to 95% stability), and warning of buffer contamination based on inconsistent calibration point convergence.