Hanna HI991301 Portable High-Range pH/EC/TDS/°C Meter

Overview

The Hanna HI991301 is a rugged, field-deployable multiparameter meter engineered for simultaneous, high-accuracy measurement of pH, oxidation-reduction potential (mV), electrical conductivity (EC), total dissolved solids (TDS), and temperature in aqueous samples. Built upon potentiometric and conductometric principles, the instrument integrates a calibrated glass pH electrode with integrated temperature sensor and solid-state conductivity cell into a single DIN-compatible probe (HI12883). Its design conforms to electrochemical measurement standards defined in ASTM D1125 (Standard Test Methods for Electrical Conductivity and Resistivity of Water) and ISO 7888 (Water quality — Determination of electrical conductivity), supporting traceable, repeatable field and lab-grade analysis across environmental monitoring, aquaculture, hydroponics, wastewater treatment, and industrial process control applications.

Key Features

• Integrated HI12883 probe featuring a conical glass pH sensing element, built-in thermistor for automatic temperature compensation (ATC), and microelectronics amplifier—enabling stable signal transmission and minimizing noise susceptibility.
• Sensor Check™ diagnostic function allows real-time verification of electrode slope, offset, and response time directly on-device—critical for GLP-compliant data integrity and preventive maintenance planning.
• Dual-line LCD display with contextual on-screen prompts guides users through calibration and measurement steps—eliminating procedural ambiguity for operators with varying technical backgrounds.
• Two-button interface (SET/HOLD) enables intuitive navigation, measurement freezing, and parameter switching (pH ↔ EC/TDS) without menu diving—optimized for glove-compatible operation in outdoor or wet environments.
• BEPS™ (Battery Error Prevention System) provides visual low-battery alert (flashing icon at <5% capacity) and prevents erroneous readings due to voltage drop—ensuring data reliability throughout battery life.
• IP67-rated housing guarantees full dust ingress protection and submersion resistance up to 1 m for 30 minutes—validated per IEC 60529—making it suitable for use in rain, humid greenhouses, or splash-prone industrial zones.
• Configurable auto-off intervals (8 min, 60 min, or disabled) extend battery service life while maintaining readiness for rapid deployment.

Sample Compatibility & Compliance

The HI991301 is validated for use with natural waters (freshwater, seawater-diluted effluents), nutrient solutions, soil extracts, cooling tower fluids, and mild industrial process streams. It excludes strongly acidic (pH 16) media, non-aqueous solvents, or viscous suspensions that impede electrode hydration or conductivity cell flow dynamics. Calibration protocols align with ISO/IEC 17025 requirements for measurement traceability: pH calibration employs NIST-traceable buffers (pH 4.01, 6.86, 9.18, or 10.01); EC/TDS calibration uses certified KCl standard (12.88 mS/cm) and NaCl-based reference (6.44 ppt or 9.02 ppt). The instrument supports audit-ready documentation when paired with optional Hanna Lab Software (HI92000) for CSV export and basic trend visualization—compatible with internal QA/QC workflows under ISO 9001 and EPA Method 120.1.

Software & Data Management

While the HI991301 operates as a standalone field instrument with no onboard data logging, it interfaces seamlessly with Hanna’s HI92000 Windows-based software via USB-to-serial adapter (HI920013). This enables transfer of timestamped measurement records—including pH, mV, EC, TDS, temperature, calibration history, and Sensor Check™ diagnostics—to secure local storage. Export formats include .csv and .xls, facilitating integration into LIMS platforms or statistical process control (SPC) dashboards. Though not FDA 21 CFR Part 11 compliant out-of-the-box, the device meets foundational ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate) when used with controlled procedures, defined roles, and manual record linkage—supporting GMP-aligned environmental monitoring programs.

Applications

• Aquaculture & Hatchery Management: Monitoring pH stability and conductivity shifts during larval development cycles; detecting early-stage osmotic stress in recirculating aquaculture systems (RAS).
• Hydroponics & Controlled Environment Agriculture: Verifying nutrient solution balance (EC/TDS vs. pH) across growth stages; diagnosing acidification from ammonium uptake or CO₂ enrichment.
• Wastewater Pre-Treatment Screening: Rapid assessment of influent pH excursions and salinity load prior to biological treatment—reducing risk of nitrifier inhibition.
• Environmental Field Surveys: Mapping pH gradients in wetlands or stream transects; correlating EC with chloride intrusion or agricultural runoff signatures.
• Education & Technical Training: Teaching fundamental electrochemical concepts—including Nernst equation application, conductivity cell geometry effects, and temperature compensation models—using a single, durable platform.

FAQ

What calibration buffers are required for routine pH verification?
NIST-traceable pH 4.01 and 7.01 buffers are recommended for two-point calibration. Optional third-point validation at pH 10.01 or 9.18 supports extended-range confidence.
Can the HI991301 measure seawater conductivity accurately?
It reports EC in mS/cm and converts to TDS using user-selectable factors (0.45–1.00). For seawater, use factor 0.65–0.70 and cross-validate against a dedicated salinity meter per ASTM D1125 Annex A4.
Is the HI12883 probe replaceable, and what is its typical service life?
Yes—the probe is field-replaceable and carries a 12-month warranty. With proper storage (in HI70300 pH storage solution) and monthly Sensor Check™ verification, functional life typically exceeds 18 months in moderate-use settings.
Does the meter support manual temperature coefficient (β) entry for non-standard electrolytes?
Yes—β compensation is fully adjustable from 0.0 to 2.4 %/°C in 0.1 increments, enabling accurate EC correction for ammonium nitrate solutions, phosphate buffers, or other non-KCl electrolytes.
How does IP67 rating impact operational durability in outdoor deployments?
IP67 certification ensures uninterrupted operation during heavy rainfall, temporary submersion, or exposure to dust-laden air—eliminating need for protective enclosures in most field scenarios while maintaining metrological integrity.