Hanna HI98309 Ultra-Pure Water Pocket Conductivity Meter

Overview

The Hanna HI98309 Ultra-Pure Water Pocket Conductivity Meter is a precision-engineered, handheld instrument designed exclusively for the measurement of ultra-low conductivity in high-purity and ultrapure water systems—commonly encountered in semiconductor manufacturing, pharmaceutical water-for-injection (WFI) loops, power plant boiler feedwater monitoring, and laboratory-grade purified water distribution networks. Unlike general-purpose conductivity meters, the HI98309 employs a dedicated two-electrode cell with optimized geometry and low-cell-constant design (typically < 0.1 cm⁻¹), enabling reliable detection down to 0.000 µS/cm and stable resolution at 0.001 µS/cm. Its measurement principle adheres to the fundamental relationship σ = G × K_cell, where conductance (G) is measured directly across the electrode pair and multiplied by the precisely characterized cell constant (K_cell) to yield conductivity (σ) in µS/cm. This architecture minimizes polarization effects and stray capacitance—critical factors when measuring resistivities exceeding 0.5 MΩ·cm (equivalent to < 2.0 µS/cm). The device operates without user calibration, relying on traceable factory calibration against NIST-traceable KCl standards at 25 °C, ensuring metrological integrity for routine QC checks in regulated environments.

Key Features

• Ultra-low range capability: Measures from 0.000 to 1.999 µS/cm with 0.001 µS/cm resolution—optimized for resistivity values up to 1.0 MΩ·cm and beyond.
• Factory-calibrated sensor: Pre-characterized two-electrode conductivity cell with documented K_cell value; eliminates need for field calibration and reduces operator dependency.
• Ergonomic, rugged housing: IP67-rated polycarbonate body engineered for glove-compatible handling in cleanroom and utility corridor environments.
• Battery-efficient operation: Powered by four LR44 button cells providing >2,000 hours of standby life and continuous measurement capability for >500 hours.
• Temperature compensation: Built-in thermistor enables automatic temperature compensation (ATC) referenced to 25 °C using linear β-coefficient algorithm per ASTM D1125.
• Low-power LCD with backlight: High-contrast display with auto-off function after 8 minutes of inactivity to preserve battery life.

Sample Compatibility & Compliance

The HI98309 is validated for use with Type I (ASTM D1193), USP Purified Water (PW), and Water for Injection (WFI) streams. It meets the electrical safety requirements of IEC 61010-1:2010 for portable measuring equipment used in laboratory and industrial settings. While not a standalone GLP/GMP-compliant data logger, its factory calibration certificate—including uncertainty budget and traceability statement—supports compliance with ISO/IEC 17025 accredited laboratories’ instrument qualification protocols. The meter satisfies preliminary verification criteria outlined in USP “Water for Pharmaceutical Purposes” for rapid field screening prior to full system validation or TOC/resistivity correlation studies.

Software & Data Management

The HI98309 operates as a standalone measurement tool with no embedded memory or digital interface (e.g., USB, Bluetooth, or RS-232). All readings are displayed in real time and intended for immediate visual verification or manual transcription into electronic lab notebooks (ELN) or LIMS. For audit-trail requirements under FDA 21 CFR Part 11, users must document measurement conditions (date, time, operator ID, sample ID, temperature, and reading) externally. Hanna provides optional calibration verification kits (e.g., HI7031L 1.41 mS/cm standard) and certified reference materials traceable to NIST SRM 3198 for periodic performance checks.

Applications

• Routine spot-checking of point-of-use (POU) ultrapure water outlets in microelectronics fabrication cleanrooms.
• Verification of deionized water quality prior to HPLC mobile phase preparation or buffer formulation.
• Monitoring reverse osmosis (RO) and electrodeionization (EDI) system effluent in pharmaceutical water generation skids.
• Field validation of conductivity sensors installed in permanent process lines—used as a reference during commissioning or troubleshooting.
• Educational demonstrations of water purity concepts, including resistivity-conductivity inverse relationships and ion contamination thresholds.

FAQ

Is the HI98309 suitable for measuring conductivity in seawater or wastewater?
No. Its 0–1.999 µS/cm range is specifically limited to ultrapure water applications; samples above ~5 µS/cm will saturate the sensor and yield inaccurate or non-responsive readings.
Can this meter be recalibrated by the user?
No. The HI98309 is shipped with a fixed, non-adjustable calibration. Hanna does not provide user-accessible calibration routines or adjustment screws; recalibration requires return to an authorized service center.
Does it compensate for temperature automatically?
Yes. An integrated thermistor provides continuous temperature sensing and applies linear ATC based on the default β = 2.0%/°C coefficient, aligned with ASTM D1125 recommendations for pure water systems.
What is the expected lifetime of the sensor?
Under typical ultrapure water use (no exposure to particulates, oils, or aggressive solvents), the platinum black-coated electrodes maintain stable performance for ≥2 years; however, physical damage or drying out may impair response time and baseline stability.
Is there a CE or UKCA marking on the device?
Yes. All HI98309 units manufactured for EEA and UK markets carry CE and UKCA markings, confirming conformity with the Electromagnetic Compatibility (EMC) Directive 2014/30/EU and Low Voltage Directive 2014/35/EU.