HACH sensION+ Portable pH Meter

Overview

The HACH sensION+ Portable pH Meter is a field-deployable, microprocessor-controlled electrochemical analyzer engineered for precision and operational robustness in demanding environmental, industrial, and laboratory settings. It operates on the fundamental principle of potentiometric measurement: detecting the potential difference between a pH-sensitive glass electrode and a stable reference electrode immersed in an aqueous sample, converting that voltage into a pH value via the Nernst equation. Integrated Automatic Temperature Compensation (ATC) ensures thermally corrected readings across the full 0–14 pH range, while the proprietary ContATC™ technology minimizes thermal lag and junction potential errors—critical for high-reproducibility measurements in variable-temperature field conditions. Designed for compliance with standard electrochemical testing protocols, the instrument supports traceable calibration workflows aligned with ISO 8655, ASTM D1293 (for pH of water), and EPA Method 150.1.

Key Features

• Ergonomic, handheld form factor with IP67-rated enclosure—fully dust-tight and submersible up to 1 meter for 30 minutes—enabling reliable operation in rain, humidity, or splashing environments.
• Backlit, high-contrast LCD display with hierarchical menu navigation reduces operator training time and minimizes missteps during routine calibrations or field measurements.
• Industrial-grade membrane keypad rated for over 6 million actuations, ensuring long-term mechanical integrity in high-frequency use scenarios such as wastewater monitoring or process QC.
• Universal BNC + ATC input accepts all standard pH electrodes—including refillable, gel-filled, and double-junction configurations—allowing seamless integration with HACH’s suite of application-optimized sensors (e.g., ruggedized probes for sludge, low-ionic-strength surface water, or high-sodium brines).
• ContATC™ electrode interface dynamically adjusts temperature compensation based on real-time thermal gradient analysis at the sensing junction, improving accuracy beyond conventional single-point ATC systems.

Sample Compatibility & Compliance

The sensION+ accommodates liquid samples across diverse matrices: potable water, wastewater effluents, cooling tower fluids, boiler feedwater, food/beverage process streams, and soil leachates (following standard extraction protocols). It complies with key regulatory frameworks including US EPA Clean Water Act field measurement guidelines, ISO/IEC 17025 requirements for measurement uncertainty documentation, and GLP-compliant data integrity expectations when paired with optional audit-trail-enabled software. While the base unit does not include built-in 21 CFR Part 11 functionality, its calibration logs, date/time stamps, and user ID fields support manual audit trail reconstruction per GMP Annex 11 and FDA guidance for non-automated systems.

Software & Data Management

Data export is supported via USB connection to HACH’s LogBook™ desktop software (Windows-compatible), enabling secure transfer of measurement records—including raw mV values, temperature readings, calibration history, and operator annotations. Each dataset is timestamped and tagged with instrument serial number and electrode ID. The software generates CSV and PDF reports compliant with internal QA review standards and facilitates trend analysis across multi-site deployments. For laboratories requiring electronic signatures and change control, third-party LIMS integration is achievable through ASCII-based serial output (RS-232 emulation over USB).

Applications

• Field verification of drinking water pH per WHO Guidelines for Drinking-water Quality and national standards (e.g., China GB 5749-2022, US EPA 815-B-21-001).
• Real-time pH monitoring during wastewater treatment—especially in equalization basins, activated sludge units, and disinfection contact tanks.
• In-process control of chemical dosing systems (e.g., lime softening, acid neutralization) where rapid response and repeatability are critical.
• Educational laboratories requiring durable, intuitive instrumentation for teaching electrochemical fundamentals and calibration best practices.
• Environmental site assessments involving soil pore water or groundwater sampling under ASTM D6475 or ISO 10390 protocols.

FAQ

What calibration buffers are supported?
The sensION+ supports custom buffer entry (pH 1.68, 4.01, 6.86, 7.00, 9.18, 10.01, 12.45) and allows user-defined values for non-standard buffers—essential for specialized applications like seawater or pharmaceutical formulations.
Does the instrument store calibration history?
Yes—up to 10 complete calibration events are retained in non-volatile memory, including date/time, buffer IDs, slope (%), offset (mV), and temperature at calibration.
Can it measure ORP/mV alongside pH?
Yes—the same electrode input supports direct mV measurement with ±1999.9 mV range and 0.1 mV resolution, suitable for redox potential assessment in disinfection or corrosion monitoring.
Is temperature measurement integrated or external?
Temperature is measured via a built-in NTC thermistor in the ATC-capable electrode; no separate probe is required. The system displays both sample temperature and compensated pH simultaneously.
What accessories are included in the portable kit?
Standard portable kits include the meter, a ruggedized pH electrode with integrated ATC, protective carrying case, calibration/storage solution vials (pH 4.01 and 7.00), calibration cups, and electrode storage cap—all configured for immediate deployment.