Hanna HI2004 Benchtop Digital Dissolved Oxygen & Saturation DO Meter with Integrated Temperature Sensor

Overview

The Hanna HI2004 is a benchtop digital dissolved oxygen (DO) and saturation DO meter engineered for precision, flexibility, and regulatory compliance in laboratory, quality control, and field-deployable applications. It employs the Clark-type polarographic measurement principle: a constant voltage (typically −0.7 V) is applied between a platinum cathode and silver anode within an electrolyte-filled cell, separated from the sample by a gas-permeable polytetrafluoroethylene (PTFE) membrane. Dissolved molecular oxygen diffuses through the membrane and is electrochemically reduced at the cathode surface, generating a diffusion-limited current proportional to the partial pressure of oxygen—directly correlating to concentration (mg/L) and saturation (%). The integrated thermistor enables automatic temperature compensation across 0–50°C, while salinity (0–40 g/L) and altitude (−500 to +4000 m) corrections ensure metrological rigor in diverse environmental and process conditions. Designed as a modular platform, the HI2004 supports benchtop, wall-mounted, and portable operational modes without hardware modification—enabling seamless transition between routine QC testing, multi-user lab workflows, and on-site validation.

Key Features

• 5.5-inch high-contrast LCD touchscreen display with 150° viewing angle—optimized for shared workspaces and remote readability up to 5 meters.
• Digital polarographic DO electrode (HI764080A/P) with embedded microchip storing calibration history, serial number, and sensor diagnostics—enabling plug-and-play recognition and GLP-compliant traceability.
• 3.5 mm proprietary electrode interface—eliminates misalignment risk and contact damage; ensures repeatable electrical connection with zero insertion force.
• Triple-mode mechanical design: benchtop stand with adjustable rotating electrode holder, wall-mount bracket for overhead installation, and lightweight handheld configuration (250 g).
• Dual USB architecture: USB-A port for direct data export to FAT32-formatted flash drives; micro-USB port for simultaneous charging and bidirectional data transfer to Windows/macOS systems.
• Comprehensive GLP data logging: each stored entry includes DO value, saturation %, temperature, salinity, altitude, calibration status, timestamp, and operator ID (user-definable).
• Auto-ranging measurement engine with configurable auto-hold, stability detection, and real-time trend graphing—reducing operator dependency and inter-observer variability.

Sample Compatibility & Compliance

The HI2004 is validated for aqueous matrices across environmental monitoring (wastewater effluent, surface water, aquaculture), pharmaceutical process water (PW, WFI), food & beverage production (brewing, bottling), and academic research. Its Clark-type electrode design ensures stable response in low-conductivity samples (>20 µS/cm recommended) and resistance to fouling in moderately turbid or particulate-laden media when used with standard membrane replacement and electrolyte (HI7041S) maintenance protocols. The instrument conforms to ISO 5814:2012 (electrochemical determination of dissolved oxygen), ASTM D888-12 (standard test methods for dissolved oxygen), and supports FDA 21 CFR Part 11 compliance when paired with validated LIMS or ELN software via exported CSV/Excel files. All firmware and calibration routines are auditable, with full electronic signature support for user-defined roles and password-protected configuration changes.

Software & Data Management

Data handling is implemented via native on-device logic—no proprietary software required. The HI2004 stores 1000 automatic readings (with user-configurable intervals), 200 interval logs, and 600 manually triggered entries. Timestamps adhere to ISO 8601 (YYYY-MM-DD HH:MM:SS), and all records include contextual metadata: ambient temperature, barometric pressure (derived from altitude input), salinity setting, electrode status flag, and calibration date. Exported files are plain-text CSV with UTF-8 encoding—compatible with Excel, Python pandas, JMP, and laboratory information management systems (LIMS). Firmware updates are delivered via USB flash drive using signed .bin files; version history and update logs are retained in non-volatile memory for audit readiness. Internal battery state-of-charge and cycle count are logged for predictive maintenance planning.

Applications

• Environmental laboratories performing EPA Method 360.1 and ISO 5815-1 compliant DO analysis in raw influent, activated sludge, and treated effluent.
• Pharmaceutical manufacturing units verifying dissolved oxygen levels in purified water distribution loops per USP and EU Annex 1 requirements.
• Aquaculture facilities monitoring pond and recirculating aquaculture system (RAS) oxygenation thresholds to prevent hypoxia-induced mortality.
• Breweries and wineries tracking DO ingress during filtration, transfer, and packaging—critical for oxidative stability assessment.
• University teaching labs demonstrating electrochemical sensor principles, diffusion-controlled kinetics, and environmental parameter interdependence.
• Field technicians conducting rapid DO profiling in rivers, lakes, and groundwater wells using the wall-mounted mode for hands-free operation.

FAQ

What electrode type does the HI2004 use, and why is it suitable for regulated environments?
It uses a Clark-type polarographic DO electrode (HI764080A/P) with a Pt cathode, Ag anode, and PTFE membrane—providing NIST-traceable accuracy, long-term stability, and documented performance per ISO 5814. Its digital chip enables automatic electrode identification and calibration history retention—key for GLP/GMP audits.
Can the HI2004 perform altitude and salinity compensation simultaneously?
Yes. Both parameters are applied concurrently during measurement calculation, ensuring accurate DO concentration reporting in high-elevation freshwater systems (e.g., mountain reservoirs) and saline estuaries.
Is the internal battery replaceable by the end user?
No. The sealed Li-ion battery is not field-replaceable; however, its cycle life exceeds 500 full charges, and diagnostic indicators report remaining capacity and health status in the system menu.
Does the HI2004 support external temperature probes?
No. Temperature sensing is exclusively performed by the integrated thermistor in the HI764080A/P electrode—ensuring spatial correlation between DO and thermal measurement points.
How often should the DO membrane and electrolyte be replaced?
Hanna recommends membrane replacement every 2–4 weeks under continuous use, or immediately after exposure to oils, solvents, or heavy metals. HI7041S electrolyte must be replenished before each membrane change to maintain optimal diffusion kinetics and signal stability.