Hanna HI98107 Portable pH Meter

Overview

The Hanna HI98107 Portable pH Meter is a compact, field-ready electrochemical instrument engineered for reliable, single-parameter pH measurement across diverse sample matrices—from aqueous solutions and process streams to environmental water samples and basic laboratory preparations. Based on potentiometric measurement principles, the HI98107 employs a combination glass pH electrode with integrated temperature sensor to deliver stable, Nernstian response in accordance with ISO 3696, ASTM D1293, and USP . Its design prioritizes robustness and operational simplicity without compromising metrological integrity: the instrument conforms to GLP-compliant data handling practices through visible calibration status indicators, battery-level monitoring, and non-volatile storage of calibration coefficients. With a measurement range spanning the full aqueous pH scale (0.00–14.00), it supports routine quality control, environmental monitoring, educational labs, and preliminary R&D screening where portability, repeatability, and traceable calibration are essential.

Key Features

• Integrated combination pH electrode with built-in Pt1000 temperature sensor enabling automatic temperature compensation (ATC) across 0.0–50.0 °C
• Large dual-line LCD display showing real-time pH value and temperature simultaneously, with dedicated icons for calibration status, low-battery warning, and ATC activation
• Two-button waterproof interface (IP67-rated housing) — one for power/on-off, one for calibration/setting navigation — minimizing user error and simplifying operation under gloves or wet conditions
• Field-serviceable electrode design: replaceable porous junction via controlled retraction of the cloth diaphragm (1–2 mm), restoring electrolyte flow and extending electrode service life without replacement
• Onboard calibration memory stores slope and offset values from up to two-point calibrations using factory-traceable buffer standards (pH 4.01, 7.01, 10.01 at 25°C)
• Configurable auto-off intervals (8 min / 60 min / off) to optimize battery longevity; CR2032 coin cell provides >100 hours of continuous operation

Sample Compatibility & Compliance

The HI98107 is validated for use with low- to medium-conductivity aqueous samples including drinking water, wastewater effluents, hydroponic nutrient solutions, aquarium water, food extracts, and buffer solutions. It is not recommended for highly viscous, non-aqueous, or strongly oxidizing media. Electrode compatibility adheres to IUPAC-recommended reference systems and meets requirements for routine compliance with EPA Method 150.1, APHA Standard Methods 4500-H⁺, and ISO 10523. The device’s ±0.1 pH accuracy at 25°C satisfies typical QC acceptance criteria for Class II pH meters per ISO/IEC 17025-accredited laboratories performing non-regulated testing. While not FDA 21 CFR Part 11 compliant out-of-the-box (due to lack of audit trail or electronic signature functionality), its calibration logs and stability indicators support manual GLP documentation workflows.

Software & Data Management

The HI98107 operates as a standalone instrument with no embedded software or connectivity interfaces (e.g., Bluetooth, USB, or RS-232). All calibration and configuration data are retained in non-volatile memory and persist through battery replacement. Users maintain traceability via printed or handwritten calibration records referencing the date, operator ID, buffer lot numbers, measured mV offsets, and observed slope (% recovery). The LCD provides immediate visual feedback: flashing “CAL” indicates incomplete or expired calibration; steady “ATC” confirms active temperature compensation; and a battery icon with percentage decrement alerts users prior to voltage drop below operational threshold (<2.7 V).

Applications

• Environmental field testing: surface water, groundwater, and wastewater pH profiling per regulatory sampling protocols
• Education: undergraduate chemistry and biology labs requiring durable, intuitive instrumentation for acid-base titration pre-checks and buffer characterization
• Aquaculture and hydroponics: daily monitoring of nutrient solution pH to maintain optimal ion availability and microbial balance
• Food & beverage QA: spot-checking rinse water, brine solutions, and product contact surfaces for sanitation compliance
• Facility maintenance: verifying neutralization efficiency in industrial effluent treatment units prior to discharge

FAQ

What calibration buffers are supported?
The HI98107 supports automatic recognition of pH 4.01, 7.01, and 10.01 standard buffers at 25°C. One- or two-point calibration routines are selectable via the dedicated CAL button.
Can the electrode be cleaned and regenerated in the field?
Yes — the cloth junction can be gently pulled outward by 1–2 mm to expose fresh electrolyte contact surface, effectively clearing clogged junctions and restoring stable readings without electrode replacement.
Is temperature measurement independently usable?
No — the temperature sensor is exclusively used for ATC during pH measurement and does not function as a standalone thermometer.
What is the expected electrode lifetime under normal use?
With proper storage (in KCl storage solution), periodic junction cleaning, and avoidance of proteinaceous or sulfide-rich samples, the integrated electrode typically delivers 12–18 months of reliable performance.
Does the instrument meet international electrical safety standards?
Yes — the HI98107 complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and carries CE marking for conformity with EU directives.