Professional Selection Guides & Technical Insights
Key Takeaway: The MadgeTech HiTemp140 is a US-made high-temperature data logger that accurately records temperature data from -200°C to +400°C. Its fully sealed 316L stainless steel housing, high-precision sensor, and FDA 21 CFR Part 11 compliant software make it an ideal tool for rigorous process validation including pharmaceutical steam sterilization, food thermal sterilization, and dry heat sterilization.
The MadgeTech HiTemp140 is a professional-grade high-temperature data logger series designed by MadgeTech Inc. (USA) specifically for data acquisition in extreme temperature environments. The series features a fully sealed 316L stainless steel housing with a built-in high-precision PT1000 platinum resistance temperature sensor, capable of continuous operation across an ultra-wide temperature range of -200°C to +400°C with ±0.1°C measurement accuracy.
The HiTemp140 series includes multiple sub-models covering different temperature ranges and probe length requirements: HiTemp140 (standard, -200°C to +260°C), HiTemp140-FP (food-grade probe), HiTemp140-2 (dual-channel), and HiTemp140-PT (autoclave-specific, up to +400°C). All models support user-customizable sampling intervals, start delays, and alarm thresholds.
The HiTemp140's fully sealed stainless steel construction enables normal operation under extreme conditions such as high-pressure steam sterilizers (121°C/134°C), dry heat sterilization ovens (180°C-250°C), and low-temperature freeze-drying (-80°C). Compared to ordinary electronic thermometers, its battery and electronic components are specially encapsulated to ensure long-term stable operation in high-temperature and high-humidity environments.
The built-in PT1000 platinum resistance sensor is factory-calibrated with NIST-traceable calibration, achieving ±0.1°C temperature accuracy. User self-calibration or factory recalibration is supported, meeting ISO 17025 laboratory quality management requirements. Data recording is stable and reliable, suitable for sterilization process validation required by FDA, EU GMP Annex 1, and other regulations.
The built-in non-volatile memory can store over 32,000 temperature readings. The high-energy-density battery can operate continuously for over 1 year at typical sampling intervals (1 minute), meeting long-term online monitoring needs. Recorded data is not lost even when the battery is depleted.
The companion MadgeTech 4 software supports electronic signatures, audit trails, user permission management, and data tamper-proofing, fully compliant with FDA 21 CFR Part 11 and EU Annex 11 electronic record compliance requirements. The software can automatically generate PDF reports including temperature curves, statistical summaries, and calibration information.
In the pharmaceutical industry, steam sterilizer (autoclave) validation is a core component of GMP compliance. The HiTemp140-PT can withstand 134°C, 2.2 bar high-pressure steam environments. By placing units at cold spots, hot spots, and representative locations within the sterilizer, it records complete temperature-time curves. Validation engineers can precisely assess sterilization hold time (≥121°C for ≥15 minutes), heat penetration effectiveness, and temperature uniformity within the sterilizer.
The HiTemp140's compact design (102mm length, 24mm diameter) allows placement inside actual product containers such as IV bags, vials, and syringes, enabling heat penetration validation under real loading conditions. This is far more convenient than traditional thermocouple wired validation methods, eliminating the complexity of wiring and sealing issues.
In the food processing industry, pasteurization and ultra-high temperature (UHT) sterilization are critical quality control processes. The HiTemp140-FP features a food-grade stainless steel probe that can directly measure core temperatures inside cans and flexible packaged foods, verifying whether sterilization F-values meet preset standards. This is of significant value for exported foods to meet FDA and EU regulatory sterilization process validation requirements.
Typical applications include: canned food heat penetration testing, dairy pasteurization validation, beverage UHT sterilization monitoring, pet food heat treatment validation, and more. The logger can travel with the product through the entire sterilization process without external wiring.
Dry heat sterilization of glassware, metal instruments, and heat-resistant materials is typically performed at 180°C-250°C. The HiTemp140 series can withstand up to +400°C, fully covering dry heat sterilization and depyrogenation (≥250°C) temperature requirements. The logger can be placed directly inside the oven to record temperature changes throughout the heating, holding, and cooling processes.
| Parameter | HiTemp140 | HiTemp140-PT | HiTemp140-FP |
|---|---|---|---|
| Temperature Range | -200°C to +260°C | -200°C to +400°C | -200°C to +260°C |
| Accuracy | ±0.1°C | ±0.1°C | ±0.1°C |
| Sensor | PT1000 | PT1000 | PT1000 (food-grade probe) |
| Storage Capacity | 32,256 readings | 32,256 readings | 32,256 readings |
| Housing Material | 316L Stainless Steel | 316L Stainless Steel | 316L Stainless Steel |
| Waterproof Rating | IP68 | IP68 | IP68 |
| Dimensions | 102mm × 24mm | 140mm × 24mm | 102mm × 24mm (with probe) |
The typical workflow for sterilization validation using the HiTemp140 is as follows:
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