Hanna HI2221 Benchtop pH/ORP/Temperature Meter
| Brand | Hanna Instruments |
|---|---|
| Origin | USA |
| Manufacturer Type | Manufacturer |
| Product Category | Imported Laboratory Instrument |
| Model | HI2221 |
| Instrument Type | Laboratory Water Quality Analyzer |
Overview
The Hanna HI2221 is a precision benchtop meter engineered for reliable, repeatable measurement of pH, oxidation-reduction potential (ORP), and temperature in laboratory water quality analysis applications. Based on potentiometric measurement principles, the instrument employs high-impedance circuitry (1012 Ω input impedance) to minimize signal drift and ensure stable electrode response across diverse aqueous matrices—including drinking water, wastewater, process streams, and environmental samples. Its dual-display interface simultaneously presents primary parameter (pH or mV) and real-time temperature, enabling immediate interpretation of compensated results without manual conversion. Designed for compliance-critical environments, the HI2221 supports traceable calibration workflows and meets fundamental requirements for GLP-compliant documentation when used with appropriate accessories and procedural controls.
Key Features
- Simultaneous dual-parameter display: pH (or mV) and temperature on a large, high-contrast LCD screen with intuitive on-screen guidance icons
- Auto-ranging ORP measurement capability: ±699.9 mV (0.1 mV resolution) and ±2000 mV (1 mV resolution) for broad redox monitoring applications
- Multi-point pH calibration: Up to 5-point automatic calibration using built-in NIST-traceable buffer points (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)
- Calibration verification function: Real-time validation of electrode slope and offset post-calibration to confirm sensor integrity
- Flexible temperature compensation: Automatic or manual mode, covering –20.0 to 120.0 °C (–4.0 to 248.0 °F) using the included HI7662 stainless steel probe
- Stable reading indicator: Visual confirmation of measurement equilibrium before data logging or recording
- BNC-compatible electrode interface: Supports interchangeable glass (e.g., HI1131P) or polymer-body (e.g., HI1230B) pH electrodes optimized for specific sample types
- USB connectivity: Enables direct data export to PC via Hanna’s HI92000 software for spreadsheet integration, trend analysis, and audit-ready reporting
Sample Compatibility & Compliance
The HI2221 is validated for use with standard aqueous solutions across pH 0–13 (glass electrode) or pH 0–10 (low-conductivity electrode HI1300B). It accommodates routine calibration and measurement per ASTM D1293 (pH of water), ISO 10523 (water quality — determination of pH), and USP (pH measurement in pharmaceutical preparations). While not inherently 21 CFR Part 11 compliant as a standalone device, its data export functionality—when paired with validated software and procedural controls—supports alignment with GMP/GLP documentation standards. The instrument operates within an ambient range of 0–50 °C and ≤95% RH, making it suitable for climate-controlled laboratories and QC environments where environmental stability is maintained.
Software & Data Management
The HI2221 integrates with Hanna’s HI92000 Windows-based data management software via USB. This application facilitates time-stamped data capture of up to 100 stored measurements, customizable report generation (including calibration logs, electrode history, and measurement sessions), and CSV/Excel export. Software features include configurable pass/fail limits, statistical summaries (mean, SD, CV%), and visual trend plotting. When deployed under documented SOPs—including user access control, electronic signature protocols, and audit trail activation—the system supports regulatory expectations for data integrity in regulated testing labs.
Applications
- Environmental monitoring labs performing EPA-method-compliant pH and ORP screening of surface water, groundwater, and effluent
- Pharmaceutical and biotechnology QA/QC departments verifying buffer preparation, cleaning validation rinse water, and purified water systems
- Food and beverage R&D and production facilities monitoring process pH in fermentation, dairy, and beverage formulation
- Academic teaching laboratories requiring robust, student-friendly instrumentation for electrochemical fundamentals instruction
- Municipal water treatment plants conducting daily pH/ORP checks for coagulation, disinfection, and corrosion control optimization
FAQ
What electrode types are compatible with the HI2221?
The meter accepts any BNC-output pH or ORP electrode, including refillable glass electrodes (HI1131P), rugged polymer-body electrodes (HI1230B series), and low-conductivity probes (HI1300B) for ultrapure water applications.
Does the HI2221 support automatic temperature compensation during pH measurement?
Yes—using the included HI7662 temperature probe, the instrument performs automatic temperature compensation across the full –20.0 to 120.0 °C range, or allows manual entry if external sensing is preferred.
Can calibration data be verified after completion?
Yes—the built-in Calibration Check function evaluates electrode slope (% recovery) and offset (mV at pH 7.01) immediately following calibration, alerting users to potential electrode degradation or contamination.
Is the HI2221 suitable for field use?
It is designed as a benchtop instrument; while portable in size (235 × 222 × 109 mm), it requires a 12 VDC power adapter and is not battery-operated or IP-rated for outdoor deployment.
What buffer standards are supported for pH calibration?
The meter includes seven pre-programmed NIST-traceable calibration points (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45), allowing flexible 1–5 point calibration strategies based on application requirements.
