testo 175 T3 Dual-Channel External Thermocouple Data Logger (Type K/T)

Overview

The testo 175 T3 is a rugged, dual-channel external thermocouple data logger engineered for long-term, unattended temperature monitoring in industrial, HVAC, pharmaceutical, and food safety applications. It operates on the principle of thermoelectric voltage measurement using standardized Type K (NiCr–Ni) and Type T (Cu–CuNi) thermocouples—enabling precise, traceable temperature acquisition across an extended range from −50 °C to +1000 °C (K-type) or −50 °C to +400 °C (T-type). Unlike integrated-sensor loggers, the testo 175 T3 features two dedicated BNC-style thermocouple inputs, allowing independent, simultaneous measurement of two physically separated points—such as supply/return lines in heating systems, inlet/outlet temperatures in thermal process validation, or ambient/core temperature gradients in cold chain logistics. Its high-reliability architecture includes non-volatile memory that retains all stored data—even during battery depletion or replacement—ensuring continuity of critical measurement records without interruption or loss.

Key Features

• Dual-channel thermocouple interface supporting simultaneous, independent acquisition from two external Type K or Type T probes
• High-capacity internal memory storing up to 1,000,000 timestamped readings with automatic rollover
• IP65-rated enclosure providing full protection against dust ingress and low-pressure water jets—suitable for demanding industrial environments
• Intuitive monochrome LCD display showing real-time values, user-defined alarm limits, min/max statistics, battery status, and over-limit indicators—no PC required for field verification
• Configurable measurement interval from 10 seconds to 24 hours, optimized for energy-efficient long-term deployment
• Automatic data backup upon battery replacement or power interruption, preserving measurement integrity per IEC 60751 and ISO/IEC 17025-aligned practices
• Wall-mount bracket included; optional lock mechanism for tamper-resistant installation in regulated facilities

Sample Compatibility & Compliance

The testo 175 T3 is designed for use with a broad portfolio of certified testo thermocouple probes—including surface, immersion, penetration, and air probes—each calibrated to NIST-traceable standards. Probe selection determines final system accuracy and application suitability: e.g., stainless-steel sheathed K-type probes for furnace monitoring, flexible T-type probes for low-temperature cryogenic storage validation, or food-grade penetration probes for HACCP-compliant thermal profiling. The device complies with EU Electromagnetic Compatibility Directive 2014/30/EU and RoHS Directive 2011/65/EU. When used with ComSoft CFR 21 Part 11 software and appropriate procedural controls, it supports audit-ready documentation for FDA-regulated environments, including electronic signatures, audit trails, and role-based access management—fully aligned with 21 CFR Part 11 Subpart B requirements for closed systems.

Software & Data Management

Data configuration, retrieval, and analysis are supported via three tiered software options: ComSoft Basic (freely downloadable) enables rapid setup, basic graphing, and CSV export; ComSoft Professional adds advanced statistical evaluation, multi-device synchronization, report templating, and automated compliance reporting; ComSoft CFR 21 Part 11 delivers full regulatory functionality—including electronic signature workflows, immutable audit logs, and user authentication—for validated pharmaceutical and biotech applications. Data transfer occurs via USB connection (cable not included) or optional SD card—both methods preserve original timestamps and metadata. All exported files include embedded calibration certificates and instrument identification, facilitating GLP/GMP traceability and third-party audit readiness.

Applications

• Thermal validation of HVAC systems: simultaneous logging of supply/return air or water loop temperatures for efficiency analysis and EN 15232 compliance verification
• Pharmaceutical cold chain monitoring: continuous tracking of warehouse, transport, and storage conditions per WHO Technical Report Series No. 961 and EU GDP Annex 9
• Industrial process control: real-time thermal profiling of ovens, autoclaves, sterilizers, and heat exchangers under ISO 9001 and ASME BPE guidelines
• Frozen food logistics: dual-point monitoring of refrigerated trailer compartments to verify temperature uniformity and detect hot/cold spots
• Energy auditing: long-term assessment of boiler feed/return differentials, radiator surface temperatures, and district heating network performance
• Research & development: stable, high-resolution temperature acquisition for material testing, reaction kinetics, and environmental chamber characterization

FAQ

Does the testo 175 T3 require external probes to operate?
Yes—the device has no built-in sensor and must be connected to at least one external Type K or Type T thermocouple probe to acquire measurements.
Is the internal memory volatile if the battery dies?
No—data is stored in non-volatile flash memory and remains intact during battery replacement or complete discharge.
Can I export raw data directly to Excel?
Yes—ComSoft Basic and higher versions support direct export to .csv and .xlsx formats, preserving timestamps, channel identifiers, and unit metadata.
What is the maximum recommended measurement interval for 3-year battery life?
A 15-minute logging interval at +25 °C ambient yields up to 3 years of operation using standard AAA alkaline batteries.
Is the testo 175 T3 suitable for outdoor use?
Its IP65 rating permits outdoor deployment in sheltered locations, but prolonged exposure to direct sunlight, rain, or sub-zero ambient conditions may affect battery performance and long-term seal integrity.
Does the device support alarm notifications beyond visual display?
No—it provides local visual alerts (flashing icons and limit violation indicators) only; remote notification requires integration with external SCADA or IoT gateways via exported data streams.