HACH sensION+ Portable Electrochemical Meter

Overview

The HACH sensION+ Portable Electrochemical Meter is an engineered field instrument designed for reliable, on-site measurement of key water quality parameters—including pH, conductivity (EC), total dissolved solids (TDS), salinity, resistivity, oxidation-reduction potential (ORP), and dissolved oxygen (DO)—using interchangeable, application-optimized electrochemical sensors. Built upon a robust coulometric and potentiometric measurement architecture, the sensION+ employs standardized electrode interfaces (MP-5 and MP-8) to ensure repeatable signal transduction across sensor types. Its core electronics feature low-drift analog front-end circuitry, temperature-compensated analog-to-digital conversion, and automatic electrode recognition via embedded sensor ID chips—enabling rapid calibration verification and minimizing operator-induced error. The meter operates in two distinct acquisition modes: stable-read mode (triggered when signal variation falls below user-defined thresholds for ≥3 seconds) and continuous-read mode (for real-time trend monitoring at 1-second intervals). All measurements adhere to internationally recognized test methods, including ASTM D1293 for pH, ASTM D1129 and ISO 7888 for conductivity, and ASTM D888 for dissolved oxygen, supporting compliance in environmental monitoring, wastewater treatment, and drinking water validation workflows.

Key Features

• Ergonomic handheld form factor with balanced weight distribution and non-slip textured grip—optimized for single-hand operation in wet or gloved conditions.
• High-contrast monochrome LCD (50 × 66 mm, 46 × 62 mm active area) with backlighting and intuitive icon-driven navigation menu—reducing training time and minimizing misoperation risk.
• IP67-rated enclosure certified to IEC 60529: fully dust-tight and submersible up to 1 m for 30 minutes; tested per MIL-STD-810G for shock resistance (drop-tested from 1.2 m onto concrete).
• Extended operational endurance: >1000 hours of continuous use on three standard AA alkaline cells; keypad rated for 6 million actuations with chemically resistant PET membrane overlay.
• Dual high-integrity electrode interfaces: MP-5 (IP67, compatible with pH1, EC5, DO6 sensors) and MP-8 (IP67, for multi-parameter probes MM110 and MM150), both featuring gold-plated contacts and silicone-sealed mating surfaces.
• Real-time electrode health monitoring: on-screen display of cumulative measurement duration serves as a maintenance scheduling indicator aligned with manufacturer-recommended recalibration intervals.

Sample Compatibility & Compliance

The sensION+ supports aqueous samples across a broad range of matrices—including freshwater, seawater, wastewater effluents, industrial process streams, and potable water—with appropriate electrode selection. Its modular probe architecture enables seamless transition between single-parameter (e.g., pH-only) and multi-parameter configurations without firmware changes. All sensor calibrations follow NIST-traceable standards, and the device maintains full audit trail capability—including operator ID, timestamp, calibration coefficients, and raw sensor output—for adherence to GLP (Good Laboratory Practice) and GMP (Good Manufacturing Practice) documentation requirements. Data integrity is preserved under FDA 21 CFR Part 11-compliant operating conditions when paired with HACH’s LogPro software and secure networked data transfer protocols.

Software & Data Management

Field-collected data are stored internally (up to 500 measurement records with date/time stamp, temperature, and electrode serial number) and exportable via USB interface to HACH’s LogPro desktop application. LogPro provides automated report generation (PDF/CSV), statistical analysis (mean, SD, min/max), calibration history tracking, and electronic signature functionality compliant with 21 CFR Part 11 Annex 11. Firmware updates are delivered through signed binary packages with SHA-256 checksum verification, ensuring system integrity during field deployment. The instrument’s embedded language engine supports five localized UIs—English, Spanish, French, Portuguese, and Chinese—without requiring reconfiguration or external localization files.

Applications

• Regulatory field monitoring for EPA Clean Water Act compliance (e.g., NPDES permit sampling).
• Drinking water distribution system integrity assessment (pH stability, corrosion index calculation, residual disinfectant correlation).
• Wastewater treatment plant influent/effluent characterization (BOD/COD surrogate estimation via DO and conductivity trends).
• Aquaculture and hydroponic nutrient solution management (real-time pH and EC feedback control).
• Environmental site assessments (soil leachate testing, groundwater plume delineation).
• Educational laboratory instruction—designed for student durability and intuitive method replication.

FAQ

What electrode types are supported by the sensION+?
The sensION+ accepts all HACH-branded MP-5 and MP-8 interface probes, including pH1 (gel-filled pH electrode), EC5 (cell constant 1.0 cm⁻¹ conductivity cell), DO6 (optical dissolved oxygen sensor), and multi-parameter models MM110 (pH/EC/Temp) and MM150 (pH/EC/DO/Temp).
Does the meter support automatic temperature compensation?
Yes—integrated thermistor-based temperature measurement (±0.2 °C accuracy) enables automatic, parameter-specific compensation algorithms per ASTM and ISO standards.
Can calibration data be exported and audited?
All calibration events—including date/time, buffer values used, slope/mV offset, and operator ID—are stored in non-volatile memory and exportable via LogPro with full digital signature and change-log functionality.
Is the sensION+ suitable for marine applications?
With IP67-rated housing and optional seawater-compatible electrodes (e.g., DO6-SW, EC5-SW), it is validated for short-term immersion and high-salinity matrix measurements per ASTM D1129 Annex A2.
How is battery replacement performed in the field?
The battery compartment features a captive screw design and O-ring seal; replacement requires no tools and maintains IP67 integrity when reassembled using the included torque-limited screwdriver.