testo 175 T2 Dual-Channel Temperature Data Logger with Integrated NTC Sensor and External NTC Probe Interface

Overview

The testo 175 T2 is a dual-channel temperature data logger engineered for regulatory-compliant, long-term thermal monitoring in cold chain logistics, food storage, pharmaceutical warehousing, and industrial process validation. It operates on the principle of high-stability NTC (Negative Temperature Coefficient) thermistor sensing—delivering traceable, repeatable measurements across two independent channels: one integrated high-precision sensor for ambient or surface temperature, and one external NTC probe interface for invasive or remote point measurement (e.g., core temperature of perishable goods). Designed to meet stringent requirements for data integrity in regulated environments, the device features non-volatile memory architecture that retains all logged values—even during battery replacement or complete power loss—ensuring continuity of critical thermal history records.

Key Features

• Dual-channel architecture: Simultaneous logging of internal ambient temperature (−35 °C to +55 °C) and external probe temperature (−40 °C to +120 °C), enabling concurrent environmental and product-core monitoring.
• High data fidelity: Built-in NTC sensor calibrated to ±0.5 °C over its primary operating range; external probe accuracy dependent on selected NTC probe model (e.g., testo 0600 1752 series), with typical performance of ±0.3 °C up to +120 °C.
• Robust data retention: 1,000,000 measurement slots stored in fail-safe flash memory; automatic backup on low-battery condition or battery swap—no data loss under power interruption.
• IP65-rated enclosure: Dust-tight and protected against low-pressure water jets—suitable for deployment in refrigerated trucks, cold rooms, wash-down zones, and distribution centers without removal for cleaning or transit.
• Intuitive local display: Shows real-time readings, user-defined alarm thresholds, min/max values, battery status, and exceedance indicators—enabling immediate field verification without PC connection.
• Flexible power management: Operates on three standard AAA alkaline batteries with up to 3 years’ service life at 15-minute logging intervals (tested at +25 °C); hot-swappable design supports uninterrupted operation.

Sample Compatibility & Compliance

The testo 175 T2 is validated for use with a broad range of NTC-based temperature probes—including penetration, surface, air, and immersion types—allowing adaptation to diverse sample geometries and thermal mass conditions. Its firmware and hardware architecture comply with DIN EN 12830:2018 for temperature monitoring equipment used in refrigerated transport and storage of perishable foodstuffs. The device satisfies HACCP prerequisite program requirements for continuous temperature verification and has undergone third-party certification for HACCP conformance. For pharmaceutical applications, optional ComSoft CFR 21 Part 11 software enables audit-trail generation, electronic signatures, and role-based access control—supporting FDA 21 CFR Part 11 compliance when deployed as part of a validated cold chain system. All units are CE-marked per EU Electromagnetic Compatibility Directive 2014/30/EU and RoHS Directive 2011/65/EU.

Software & Data Management

Data configuration, retrieval, and analysis are supported through testo’s ComSoft software suite—available in three tiers to match operational rigor and regulatory scope. ComSoft Basic (freely downloadable) provides essential functionality: instrument setup, start/stop logging, and CSV export compatible with Excel® for basic trending and reporting. ComSoft Professional adds advanced features including multi-device synchronization, statistical evaluation (mean, standard deviation, CPK), automated report generation (PDF/HTML), and customizable alarm logic. For GxP-regulated environments, ComSoft CFR 21 Part 11 offers full 21 CFR Part 11 compliance: electronic signature enforcement, immutable audit trails, user privilege management, and data encryption during USB or SD card transfer. Raw data exports retain full timestamp resolution (ms-level precision) and channel metadata, ensuring traceability from acquisition to archival. Data transfer occurs via mini-USB cable (not included) or optional SD card (up to 32 GB, FAT32 formatted).

Applications

• Food cold chain validation: Monitoring both refrigerated vehicle cabin temperature and internal product core temperature during transport and storage—critical for compliance with EU Regulation (EC) No 852/2004 and FDA Food Safety Modernization Act (FSMA) requirements.
• Pharmaceutical warehouse qualification: Continuous mapping of temperature uniformity in controlled-room-temperature (CRT) and cold storage areas, supporting IQ/OQ/PQ documentation.
• Process validation in baking, sterilization, or freeze-drying: Capturing transient thermal profiles using high-temperature NTC probes (e.g., testo 0600 1752-1) with extended range up to +120 °C.
• Environmental chamber monitoring: Long-duration stability testing of electronics, polymers, or packaging materials under thermal stress conditions.
• HACCP plan execution: Real-time alerting on temperature excursions beyond critical limits, with visual indicators and stored exceedance logs for root-cause analysis.

FAQ

Is the testo 175 T2 compliant with FDA 21 CFR Part 11?
Yes—when used with the optional ComSoft CFR 21 Part 11 software, the device supports electronic signatures, audit trails, and secure user authentication required for regulated pharmaceutical and biotech applications.
What is the maximum external probe temperature the device can record?
The external NTC interface supports probes rated up to +120 °C; actual upper limit depends on the connected probe’s specifications—not the logger itself.
Does the device require factory calibration before first use?
Each unit ships with an individual calibration certificate traceable to national standards (DKD/DAkkS-accredited); no additional calibration is required prior to deployment.
Can data be exported directly to Excel without proprietary software?
Yes—ComSoft Basic generates native .csv files fully compatible with Microsoft Excel®, LibreOffice Calc, and statistical analysis platforms.
Is the SD card slot compatible with encrypted or password-protected cards?
No—the SD card interface operates in standard FAT32 mode only; encryption must be applied post-transfer using host-system tools.
What happens if the battery dies mid-log?
All stored data remains intact due to non-volatile memory; the device resumes logging immediately upon battery replacement, with no gap or timestamp reset.