ISOTECH 525Isis Ultra-Low Temperature Dry-Block Calibrator

Overview

The ISOTECH 525Isis is a purpose-engineered ultra-low temperature dry-block calibrator designed for high-accuracy thermometric sensor verification and calibration in metrology laboratories, pharmaceutical quality control environments, and aerospace test facilities. Unlike traditional liquid-bath or refrigerated bath calibrators, the 525Isis achieves stable operation down to −100 °C using a proprietary multi-stage Peltier-based thermoelectric cooling architecture—eliminating the need for cryogenic liquids, compressor-based refrigerants, or hazardous coolants. Its measurement principle relies on precise thermal equilibrium establishment within a high-conductivity aluminum alloy block, coupled with integrated Pt100 reference sensors and closed-loop PID temperature control. This enables traceable calibration of resistance temperature detectors (RTDs), thermocouples (Types T, J, K, S, R, B, E, N), and thermistors across its full operating range, supporting compliance with ISO/IEC 17025, ASTM E2877 (Standard Guide for Calibration of Thermal Sensors), and EURAMET cg-18 (Guidelines on Calibration of Thermometers). The unit’s design emphasizes long-term stability, low maintenance, and operational safety—critical for regulated environments where audit readiness and uninterrupted calibration workflows are mandatory.

Key Features

• Ultra-low temperature capability: Stable, repeatable operation from −100 °C to +40 °C without liquid media or external chillers
• High thermal stability: ±0.03 °C at 0 °C and ±0.02 °C at 90 °C over 30-minute dwell periods—verified per ISO 17025 internal validation protocols
• Exceptional spatial uniformity: Radial uniformity ≤0.01 °C; axial gradient ≤0.1 °C at 0 °C and ≤0.2 °C at −90 °C—ensuring consistent sensor immersion performance
• Durable thermal block: Precision-machined anodized aluminum well (Ø35 mm × 160 mm depth) optimized for rapid heat transfer and minimal thermal lag
• Modular insert system: Standard six-hole sleeve set accommodates common probe diameters (9.5 mm, 8.0 mm, two × 6.4 mm, two × 4.5 mm); optional custom inserts available for specialized sensor geometries
• Robust power management: 200 W input with universal 100–240 VAC, 50/60 Hz compatibility—suitable for global laboratory deployment without voltage conversion hardware
• Extended service life: Rated for >20,000 hours of continuous operational duty—equivalent to >10 years under typical calibration lab usage profiles

Sample Compatibility & Compliance

The 525Isis supports calibration of contact temperature sensors requiring immersion depths ≥100 mm, including industrial-grade Pt100/Pt1000 RTDs, thin-film and wire-wound thermistors, and base-metal and noble-metal thermocouples. Its well geometry and thermal mass distribution comply with ASTM E74-22 (Standard Practice for Calibration of Laboratory Thermometers) requirements for minimum immersion depth and axial gradient limits. All internal reference sensors are factory-traceable to NPL (UK) standards, and calibration certificates include uncertainties calculated per GUM (JCGM 100:2008). The instrument meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and low-voltage safety (EN 61010-1), and is suitable for use in GLP- and GMP-regulated settings when operated with documented procedures and periodic verification per ISO/IEC 17025 clause 6.4.

Software & Data Management

While the 525Isis operates as a standalone calibrator with intuitive front-panel controls and real-time display of setpoint, actual block temperature, and stability status, it integrates seamlessly with ISOTECH’s optional CalSoft Pro software suite via RS-232 or USB-to-serial interface. CalSoft Pro enables automated calibration sequences, data logging at user-defined intervals (down to 1-second resolution), uncertainty budgeting, certificate generation (PDF/CSV), and electronic signature support compliant with FDA 21 CFR Part 11 Annex 11 requirements. Audit trails record all parameter changes, calibration events, and user actions—including timestamps and operator IDs—to support regulatory inspections and internal quality audits.

Applications

• Primary and secondary calibration of temperature sensors in national metrology institutes and accredited calibration labs
• Verification of environmental chamber and incubator sensors in pharmaceutical manufacturing (per ICH Q5C and EU GMP Annex 15)
• Thermal validation of cold chain monitoring systems used in biologics and mRNA vaccine distribution
• Research-grade low-temperature characterization of novel thermoelectric materials and cryogenic sensor prototypes
• Field-deployable calibration for offshore oil & gas platforms and polar research stations—enabled by its compact footprint (420 mm wide) and absence of liquid handling requirements

FAQ

Does the 525Isis require regular refrigerant servicing or coolant replenishment?

No. It uses solid-state thermoelectric cooling and contains no compressors, refrigerants, or consumable liquids.
Can the 525Isis be used for calibrating sensors with non-standard diameters?

Yes. Optional custom-diameter sleeves are available upon request, and the standard six-hole insert accommodates most industrial probe sizes.
Is the unit compatible with automated calibration management systems (LIMS/QMS)?

Yes—via CalSoft Pro’s export-ready CSV reports and API-compatible data streaming for integration with major LIMS platforms.
What is the recommended recalibration interval?

ISOTECH recommends annual verification against a certified reference thermometer; frequency may be adjusted per risk assessment in accordance with ISO/IEC 17025 clause 6.4.3.
Does the 525Isis support dual-zone or differential temperature calibration?

No—it is a single-zone dry-block calibrator. For multi-point or differential applications, pairing with a high-accuracy reference thermometer and external controller is required.