Hanna HI8733 Portable Conductivity Meter

Overview

The Hanna HI8733 is a field-deployable, single-parameter portable conductivity meter engineered for reliable in-situ and laboratory-based measurement of electrical conductivity (EC), total dissolved solids (TDS), resistivity, salinity, and temperature. It operates on the principle of four-electrode (four-ring) conductometric measurement — a robust alternative to traditional two- or three-electrode systems that suffer from polarization errors and electrode fouling. By eliminating current-induced polarization at the electrode–solution interface, the HI8733 achieves stable, reproducible readings across an extended dynamic range without requiring frequent recalibration or electrode swapping. Its integrated temperature sensor enables automatic temperature compensation (ATC) per user-defined linear β coefficients (0.0–2.5 %/°C), ensuring compliance with standard EC reporting conventions (e.g., referenced to 25 °C). Designed for rugged outdoor use, the instrument features a chemically resistant PVC body and a sealed, splash-proof housing rated for continuous operation in high-humidity environments (up to 100% RH).

Key Features

• Four-ring conductivity probe: Enables accurate, low-drift measurements across four decades of conductivity (0.1–199,900 µS/cm equivalent) using a single electrode — no manual range switching or probe substitution required.
• Multi-range conductivity display: Four selectable ranges cover ultra-low ionic strength (e.g., ultrapure water monitoring) through high-conductivity industrial effluents (up to 199.9 mS/cm).
• Integrated ATC with adjustable β coefficient: Supports calibration and reporting per ISO 7888, ASTM D1125, and USP , accommodating diverse sample matrices including natural waters, wastewater, and nutrient solutions.
• Single-point calibration workflow: Simplified manual calibration via dedicated rotary knob — eliminates reliance on micro-adjustment screws and reduces operator error.
• Large LCD with intuitive icon-driven interface: Displays real-time conductivity, TDS, resistivity, salinity, and temperature simultaneously; includes battery status indicator and range-selection prompts.
• Field-optimized ergonomics: Compact form factor (145 × 80 × 36 mm), lightweight design (230 g), and IP67-equivalent ingress protection ensure durability during transport and deployment in remote sampling locations.

Sample Compatibility & Compliance

The HI8733 is validated for use with aqueous samples across environmental, agricultural, aquaculture, and light industrial applications — including freshwater, seawater dilutions, hydroponic reservoirs, boiler feedwater, and cleaning-in-place (CIP) rinse solutions. Its four-ring electrode minimizes errors caused by surface contamination, biofilm formation, or variable cell geometry, making it suitable for unfiltered or turbid samples where conventional electrodes exhibit drift. The instrument adheres to fundamental metrological requirements outlined in ISO/IEC 17025 for field instrumentation and supports GLP-compliant data recording when used with traceable calibration standards (e.g., KCl reference solutions certified to NIST-traceable values). While not equipped with electronic audit trails or CFR Part 11 functionality, its manual calibration log and stable analog signal path enable straightforward validation under routine QC protocols.

Software & Data Management

The HI8733 operates as a standalone, battery-powered measurement system with no onboard data logging or Bluetooth/Wi-Fi connectivity. All readings are displayed in real time and intended for immediate transcription into field notebooks or LIMS-compatible spreadsheets. For traceability, users are advised to record calibration date, standard used (e.g., 1413 µS/cm KCl), β coefficient setting, and ambient temperature alongside each measurement. Hanna provides downloadable calibration verification worksheets and application notes aligned with EPA Method 120.1 and APHA Standard Methods 2510B, facilitating documentation for internal audits or regulatory submissions.

Applications

• Environmental monitoring: Stream, lake, and groundwater EC profiling for baseline characterization and pollution detection.
• Aquaculture and hydroponics: Real-time tracking of nutrient solution conductivity to maintain optimal ion availability for plant or aquatic organism growth.
• Water treatment: Verification of deionization efficiency, RO membrane integrity, and pretreatment chemical dosing.
• Educational laboratories: Teaching core electrochemical concepts including solution conductivity, Kohlrausch’s law, and temperature dependence of ionic mobility.
• Food & beverage QA: Rapid assessment of brine concentration, wash water salinity, and process rinse conductivity.

FAQ

Does the HI8733 support multi-point calibration?
No — it is designed exclusively for single-point calibration using a single standard (typically 1413 µS/cm KCl). This simplifies field operation while maintaining accuracy within ±1% F.S. across all ranges.
Can the HI8733 measure conductivity in non-aqueous solvents?
No — it is calibrated and validated only for aqueous electrolyte solutions. Measurements in organic solvents or highly viscous media will yield inaccurate results due to altered electrode kinetics and dielectric response.
Is the temperature sensor replaceable independently of the conductivity probe?
No — the NTC thermistor is embedded within the four-ring PVC probe assembly and is not serviceable as a separate component.
What is the recommended calibration frequency for routine field use?
Daily calibration is advised before first use and after prolonged exposure to extreme temperatures or high-conductivity samples; weekly verification suffices for stable, low-risk applications.
Does the HI8733 comply with FDA 21 CFR Part 11?
No — it lacks electronic signature capability, audit trail generation, or secure user authentication. It is intended for non-GMP environments where manual records satisfy regulatory expectations.