ISOTECH TTI-10 Dual-Channel Handheld Precision Thermometer

Overview

The ISOTECH TTI-10 Dual-Channel Handheld Precision Thermometer is a portable, high-stability temperature measurement instrument engineered for metrological-grade field applications where traceable accuracy and dual-sensor correlation are essential. It operates on the fundamental principle of platinum resistance thermometry—leveraging the well-characterized, highly repeatable resistive response of platinum elements (Pt100 or Pt1000) to temperature changes in accordance with IEC 60751 and ITS-90 reference functions. Unlike basic digital thermometers, the TTI-10 employs four-wire resistance measurement architecture with low-noise current sourcing and ratiometric ADC conversion to eliminate lead-wire resistance errors and minimize self-heating effects. Its calibrated measurement range spans –200 °C to +660 °C (dependent on probe selection), with a base accuracy of ±10 mK at 0 °C and system-level uncertainty maintained below 20 mK when used with ISOTECH’s SEMI-compliant standard platinum resistance thermometers (SPRTs). Designed for calibration laboratories, semiconductor process monitoring, pharmaceutical cold chain validation, and ISO/IEC 17025-accredited facilities, the TTI-10 delivers laboratory-grade performance in a rugged, battery-powered handheld form factor.

Key Features

• Dual independent PRT input channels with simultaneous real-time measurement and differential comparison capability
• 0.001 °C resolution and ±10 mK accuracy at reference point, validated per ISO/IEC 17025 procedures
• Integrated data logger storing up to 4,000 timestamped readings—including minimum, maximum, and arithmetic mean values per channel
• Configurable logging interval from 1 second to 30 minutes, supporting both transient thermal profiling and long-term stability monitoring
• USB 2.0 interface compliant with CDC ACM class drivers—no proprietary runtime required for host PC recognition
• Backlit graphical LCD with intuitive menu navigation and real-time statistical overlay (ΔT, drift rate, standard deviation)
• Internal rechargeable Li-ion battery providing >12 hours continuous operation; supports hot-swap charging via USB-C
• Rugged IP54-rated enclosure with rubberized grip and drop-tested to 1.2 m per MIL-STD-810G

Sample Compatibility & Compliance

The TTI-10 is specifically optimized for use with ISOTECH’s family of SEMI-standard platinum resistance probes—including the TTP-100 (100 Ω, 4-wire, sheathed SPRT) and TTP-1000 (1000 Ω, low-mass surface probe)—all individually calibrated and supplied with UKAS-accredited certificates traceable to the National Physical Laboratory (NPL). Probe interchangeability is ensured via standardized DIN 43760-compatible connectors and automatic sensor identification via embedded EEPROM. The instrument meets electromagnetic compatibility requirements per EN 61326-1:2013 (Class B) and safety compliance per IEC 61010-1:2010 (CAT II 300 V). All firmware and calibration constants are digitally signed and stored in write-protected memory to support GLP/GMP audit readiness. Full traceability documentation—including as-found/as-left reports, uncertainty budgets, and calibration interval recommendations—is generated automatically during software-assisted verification.

Software & Data Management

The TTI-10 interfaces natively with ISOTECH Cal Notepad—a Windows-based metrology software platform designed for calibration record management and uncertainty analysis. Cal Notepad supports automated data import via USB virtual COM port, real-time graphing with dual-channel overlay, customizable report templates (PDF/CSV/XLSX), and configurable pass/fail limits aligned with ISO 17025 clause 7.7. The software implements full 21 CFR Part 11 compliance features including electronic signatures, audit trails with immutable timestamps, role-based user access control, and secure encrypted local database storage. Raw measurement data retains full metadata—including probe serial numbers, environmental conditions (if external humidity sensor connected), operator ID, and GPS coordinates (when paired with optional Bluetooth GNSS module). Exported datasets include full uncertainty propagation calculations per GUM (JCGM 100:2008) using probe-specific covariance matrices.

Applications

• On-site verification of temperature uniformity in environmental chambers, autoclaves, and stability incubators per ISO 14644-3 and USP
• Differential thermal monitoring of wafer chucks, ESD-safe workbenches, and cleanroom HVAC ducts in semiconductor fabrication facilities
• Validation of cryogenic storage systems (-196 °C LN₂) and ultra-low temperature freezers (-80 °C) per FDA 21 CFR Part 211 and EU Annex 15
• Field calibration of industrial RTDs and thermocouples against reference SPRTs using fixed-point cells (e.g., gallium, indium, water triple point)
• Thermal mapping of pharmaceutical transport containers and cold chain logistics assets under dynamic ambient conditions
• Research-grade temperature profiling in materials science labs—e.g., phase transition detection in polymers, superconductors, or battery electrolytes

FAQ

What types of platinum resistance thermometers (PRTs) are compatible with the TTI-10?
The TTI-10 supports both Pt100 and Pt1000 sensors configured in 4-wire mode, including ISOTECH’s TTP-series SPRTs and third-party probes meeting IEC 60751 Class A or AA tolerances. Probe auto-identification requires embedded EEPROM with manufacturer-defined calibration coefficients.
Is the TTI-10 suitable for accredited calibration laboratories?
Yes—the instrument’s documented measurement uncertainty (<20 mK), traceable calibration hierarchy, and software audit-trail capabilities fully support ISO/IEC 17025:2017 clause 6.5 (measurement traceability) and clause 7.7 (results reporting).
Can logged data be exported for external analysis in MATLAB or Python?
Yes—Cal Notepad exports time-stamped CSV files with SI-unit headers, metadata JSON sidecar files, and optional uncertainty columns. Native Python libraries (e.g., isotech_tti_reader) are available via PyPI for direct binary file parsing.
Does the TTI-10 require annual recalibration?
Per ISOTECH’s recommended calibration interval policy, annual verification is advised for routine metrological use; however, interval adjustments may be justified via risk-based assessment per ILAC G8:2022 guidelines, especially when used with stable SPRTs in controlled environments.