Hanna HI9241 Waterproof Portable Thermistor Thermometer

Overview

The Hanna HI9241 Waterproof Portable Thermistor Thermometer is a precision-engineered handheld instrument designed for rapid, reliable, and repeatable temperature measurements across food safety, catering, retail, pharmaceutical cold chain, and laboratory field applications. Utilizing a high-stability NTC thermistor sensor housed in a rugged stainless-steel HI765PW penetration probe, the HI9241 delivers fast thermal response (≤6 seconds to 90% of final value) and calibrated accuracy of ±0.4 °C at 20 °C—traceable to NIST-certified reference standards. Its microprocessor-controlled architecture integrates real-time linearization, automatic ambient compensation, and BEPS (Battery Error Prevention System), which actively monitors voltage drift to suppress erroneous readings caused by declining battery performance—a critical safeguard in time-sensitive food temperature checks per FDA Food Code §3-201.12 and EU Regulation (EC) No 852/2004.

Key Features

• IP67-rated enclosure: Fully submersible up to 1 meter for 30 minutes; resistant to washdown, steam, dust, and accidental drops—validated per IEC 60529
• Large, high-contrast backlit LCD with intuitive one-button interface: Enables rapid power-on, calibration, and measurement without menu navigation—optimized for gloved operation in commercial kitchens
• BEPS low-battery protection system: Continuously evaluates battery voltage during measurement cycles and displays a dedicated icon when voltage falls below operational threshold, preventing false compliance records
• Auto-power-off after 8 minutes of inactivity: Extends battery life while maintaining readiness for immediate use—critical in high-throughput inspection workflows
• HI765PW stainless-steel penetration probe: 3.5 mm diameter, 150 mm length, food-grade polished finish; designed for rapid insertion into solids (e.g., meat, cheese, dough) and semi-solids (e.g., sauces, custards)
• Calibration-ready design: Supports two-point verification using certified ice point (0.0 °C) and boiling water (100.0 °C, adjusted for local barometric pressure) per ASTM E74–22 guidelines

Sample Compatibility & Compliance

The HI9241 is validated for direct-contact measurement in a broad range of food matrices—including raw and cooked meats, dairy products, baked goods, ready-to-eat meals, and chilled/frozen preparations—without cross-contamination risk due to its seamless probe housing and chemical-resistant ABS/PC body. It meets functional requirements outlined in USDA FSIS Directive 7120.1 (Temperature Monitoring in Meat & Poultry Processing), FDA Bacteriological Analytical Manual (BAM) Chapter 18 (Thermometer Validation), and Codex Alimentarius CAC/RCP 1-1969 (Recommended International Code of Practice). While not a data-logging device, its measurement stability and repeatability support GLP-aligned recordkeeping when paired with manual log sheets or LIMS-integrated digital forms compliant with 21 CFR Part 11 signature requirements.

Software & Data Management

The HI9241 operates as a standalone field instrument with no embedded firmware updates or cloud connectivity. All calibration, measurement, and battery-status functions are executed locally via hardware-based logic—ensuring deterministic response times and eliminating cybersecurity vulnerabilities associated with networked devices. Users may document readings manually or integrate results into external QA/QC platforms via barcode-scannable calibration certificates (supplied with each unit) and traceable serial-number registration. Hanna provides downloadable calibration checklists and HACCP plan templates aligned with ISO 22000:2018 Annex SL clause 8.5.1 (Control of Monitoring and Measuring Resources).

Applications

• HACCP Critical Control Point (CCP) monitoring: Core temperature verification during cooking, cooling, hot-holding, and cold storage
• Foodservice quality assurance: Batch validation prior to service, receiving inspection for frozen/refrigerated deliveries
• Regulatory audit preparation: On-site temperature verification during USDA, FDA, or local health department inspections
• Training and education: Demonstrating proper probe insertion depth, dwell time, and calibration frequency to food handlers
• Pharmaceutical logistics: Ambient and refrigerated transport temperature spot-checks per WHO Technical Report Series No. 961 (Annex 9)
• Research and development labs: Preliminary thermal profiling in formulation trials where portability and speed outweigh continuous logging needs

FAQ

What is the recommended calibration frequency for the HI9241 in daily food safety operations?
Per FDA Food Code 2022 §3-201.13, thermometers used for time/temperature control must be calibrated before each shift, before each new batch, and after exposure to extreme temperatures—verified using ice water (0.0 °C) and/or boiling water (adjusted for elevation).

Can the HI765PW probe be autoclaved?
No. The HI765PW probe is not autoclavable; it is designed for surface disinfection using food-safe sanitizers (e.g., 200 ppm chlorine or 70% ethanol) and mechanical cleaning per FDA Food Code §3-201.15.

Does the HI9241 meet ISO/IEC 17025 requirements for accredited laboratories?
While the HI9241 itself is not an accredited measuring instrument, its measurement uncertainty budget (±0.4 °C at 20 °C, k=2) and NIST-traceable calibration certificate enable inclusion in laboratory scope assessments when operated under documented SOPs and environmental controls.

Is the battery compartment sealed to maintain IP67 integrity?
Yes—the battery cover features dual O-ring sealing and a torque-limited screw mechanism, independently verified per IEC 60529 test protocol for dust and immersion resistance.