ChemTron TFX Series Precision Contact Thermometers

Overview

The ChemTron TFX Series comprises a family of high-accuracy, handheld contact thermometers engineered for laboratory, industrial process, and quality assurance applications requiring reliable temperature monitoring across extreme thermal ranges. Each model employs platinum resistance thermometry (Pt1000) — a metrologically stable, internationally standardized sensing principle defined in IEC 60751 — ensuring long-term repeatability and minimal drift. Unlike infrared or thermocouple-based instruments, the TFX series delivers direct, conductive thermal measurement via interchangeable Lemosa-compatible probes, eliminating emissivity errors and ambient radiation interference. The core architecture is optimized for environments demanding ruggedness without compromising resolution: IP67-rated enclosures withstand dust ingress and temporary immersion, while the integrated microprocessor supports real-time linearization of Pt1000 resistance curves per DIN EN 60751 Class A tolerances. Designed for traceability-critical workflows, every unit ships with a factory-issued 3-point calibration certificate referencing NIST-traceable standards.

Key Features

• Pt1000-based measurement engine compliant with IEC 60751 and DIN EN 60751 Class A specifications
• Extended operational range: TFX430 supports -100 °C to +500 °C; TFX410/410-1 and TFX420/422C cover -50 °C to +300 °C or +200 °C respectively
• High-resolution display: 0.01 °C resolution within -10.00 °C to +199.99 °C (TFX430); 0.1 °C elsewhere across all models
• IP67-rated housing certified to IEC 60529 for full dust protection and water resistance up to 1 m for 30 minutes
• User-replaceable 3.0 V lithium battery with ≥5 years typical service life under standard usage conditions
• Lemosa probe interface enabling compatibility with a broad portfolio of ChemTron-certified Pt1000 sensors (e.g., rigid stem, flexible cable, surface-mount, and immersion variants)
• On-device data functions including Min/Max/Hold, programmable sampling interval (1–15 s on TFX430), and auto-power-off

Sample Compatibility & Compliance

The TFX series is not sensor-inclusive by default — probe selection is application-driven and calibrated separately. Compatible Pt1000 sensors include 0.6 m shielded cables (e.g., TFX410/410-1), miniature 3×12 mm encapsulated elements (TFX422C), and high-temperature variants rated for continuous exposure up to 500 °C (TFX430). All configurations support compliance with ISO/IEC 17025-accredited calibration protocols when used with documented probe certificates. The instruments meet CE marking requirements under the EU Measuring Instruments Directive (MID) Annex MI-001 for thermometers, and their calibration documentation satisfies audit requirements for GLP, GMP, and FDA 21 CFR Part 11 environments where electronic records and signature integrity are mandated. Traceability paths extend to national metrology institutes via ChemTron’s accredited calibration laboratory (DAkkS Certificate No. D-K-12345-0001).

Software & Data Management

While the TFX series operates as a standalone field instrument, optional USB-to-Lemosa adapters (sold separately) enable connection to ChemTron’s TFX-Link PC software for data logging, report generation, and re-calibration verification. The software supports CSV export, time-stamped measurement archives, and overlay of multi-channel probe data — essential for validation protocols such as IQ/OQ/PQ in pharmaceutical manufacturing. All stored readings retain embedded metadata: timestamp, probe ID, operator code (user-configurable), and environmental status flags (e.g., battery level, sensor disconnect warning). Audit trails comply with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available), satisfying regulatory expectations for data integrity in regulated industries.

Applications

• Validation of autoclave, sterilizer, and oven temperature uniformity (per ISO 17025 and ASTM E2875)
• In-process monitoring of chemical reaction vessels, extruders, and heat exchangers
• Calibration transfer between reference standards and working thermometers in metrology labs
• Environmental chamber qualification (ICH Q5C, USP )
• Food safety HACCP critical control point verification (ISO 22000)
• Material testing under thermal cycling (ASTM D696, ISO 11359)

FAQ

Are sensors included with the TFX430 unit?
No — the TFX430 (Order No. 1340-5430) is supplied without a probe. Sensors must be ordered separately using compatible Lemosa-interface Pt1000 models.

What does the 3-point factory calibration certificate cover?
It documents verification at three evenly spaced points across the instrument’s specified range (e.g., -50 °C, 0 °C, and +200 °C for TFX420), with deviations reported against NIST-traceable references and uncertainty budgets per ISO/IEC 17025.

Can the TFX series be used in hazardous areas?
Not intrinsically safe by default. For Zone 1/2 or Class I Div 1 environments, consult ChemTron’s Ex-certified accessories and enclosure options — standard units lack ATEX or IECEx certification.

Is firmware upgrade capability available?
Yes — firmware updates are distributed via ChemTron’s secure customer portal and applied using the TFX-Link software and certified programming adapter.

How is measurement uncertainty determined for my specific probe?
Total uncertainty depends on combined contributions from the meter (±0.05 °C at mid-range for TFX430), probe tolerance (e.g., Pt1000 Class A = ±(0.15 + 0.002|t|) °C), and calibration uncertainty. ChemTron provides uncertainty calculators and application notes upon request.