ISOTECH POTS-SLIM Fixed-Point Preservation Furnace
| Brand | ISOTECH |
|---|---|
| Origin | United Kingdom |
| Model | POTS-SLIM |
| Type | Portable Dry-Block Fixed-Point Preservation Furnace |
| Heating Configuration | Triple-zone (main + upper/lower auxiliary heaters) |
| Vertical Temperature Uniformity | ±0.1 °C over fixed-point cell height |
| Operating Modes | Freezing Curve & Melting Curve Execution |
| Compliance | Designed for ITS-90 fixed-point realization and calibration traceability |
Overview
The ISOTECH POTS-SLIM Fixed-Point Preservation Furnace is a compact, portable dry-block furnace engineered specifically for the stable thermal maintenance and reproducible phase-transition characterization of high-purity fixed-point cells—such as Sn (231.928 °C), Zn (419.527 °C), Al (660.323 °C), and Ag (961.78 °C). Unlike conventional large-volume fixed-point furnaces, the POTS-SLIM employs a triple-zone resistive heating architecture: one central main heater flanked by independently controllable upper and lower auxiliary heaters. This configuration enables precise vertical temperature gradient management across the cell’s axial length, achieving a uniformity of ±0.1 °C within the critical immersion zone where the fixed-point material undergoes solid–liquid equilibrium. The furnace operates under closed-loop PID control with high-stability platinum resistance thermometers (PRTs) embedded in the block, ensuring thermal stability better than ±0.5 mK over 10-minute intervals during plateau acquisition—a prerequisite for ITS-90 compliant fixed-point realization.
Key Features
- Compact form factor (slim profile) optimized for laboratory benchtop deployment and field metrology applications
- Triple-zone heating system with software-adjustable power distribution ratios for active vertical field shaping
- High-density ceramic block with low thermal mass and exceptional radial symmetry for rapid thermal equilibration
- Integrated 4-wire PRT sensor array with individual calibration coefficients stored in non-volatile memory
- Front-panel touchscreen interface with real-time plateau monitoring, derivative curve visualization, and automatic melt/freeze detection
- RS-232 and USB-C digital interfaces supporting SCPI command set for integration into automated calibration systems
- Compliance-ready firmware architecture supporting audit trails, user access levels, and configurable data logging intervals
Sample Compatibility & Compliance
The POTS-SLIM accommodates standard 12–18 mm diameter fixed-point cells (e.g., sealed quartz or graphite crucibles containing ultra-high-purity metals per ISO/IEC 17025 certified specifications). Its thermal design meets the spatial and temporal stability requirements outlined in ISO 5725-2 (accuracy and precision), ASTM E2877 (standard practice for fixed-point calibration), and EURAMET cg-18 (guideline for metal fixed-point realization). When used with NIST-traceable reference PRTs and validated cell handling protocols, the system supports calibration uncertainty budgets compliant with ILAC-P10:2023 for thermometry laboratories seeking accreditation to ISO/IEC 17025. The furnace itself is CE-marked and conforms to IEC 61010-1 safety standards for electrical equipment for measurement, control, and laboratory use.
Software & Data Management
The included ISOTECH ThermoCal Suite v3.2 provides full instrument control, real-time plateau analysis, and automated ITS-90 deviation reporting. Software features include multi-curve overlay, first-derivative peak detection for liquidus/solidus identification, and export of raw time–temperature datasets in CSV and IEEE 1584-compliant .tdms formats. All calibration events are timestamped and logged with operator ID, cell serial number, ambient conditions, and heater power profiles. Audit trail functionality satisfies FDA 21 CFR Part 11 requirements for electronic records and signatures, including role-based permissions, immutable log entries, and cryptographic hash verification of archived datasets. Data integrity is further reinforced via optional networked backup to secure on-premise NAS or validated cloud storage endpoints.
Applications
- Primary and secondary calibration of SPRTs, RTPWs, and industrial PRTs against ITS-90 defining fixed points
- Validation and periodic verification of high-accuracy temperature measurement chains in national metrology institutes (NMIs)
- On-site fixed-point preservation during inter-laboratory comparisons (ILCs) and key comparison exercises (KCDB)
- Research-grade investigation of phase-transition hysteresis, supercooling behavior, and impurity-induced depression in pure-metal systems
- Support for GMP-regulated thermal validation studies requiring documented traceability to SI units via fixed-point anchors
FAQ
What fixed-point cells are compatible with the POTS-SLIM?
Standard 12 mm and 16 mm diameter sealed metal fixed-point cells—including Sn, Zn, Al, Cu, and Ag—are fully supported. Custom bore adapters are available for non-standard diameters.
Does the POTS-SLIM support both freezing and melting mode operation?
Yes. The triple-zone control algorithm dynamically adjusts heater power distribution to maintain optimal thermal gradients for either directional solidification (freezing) or controlled heating (melting), enabling full ITS-90 compliance for both modes.
Is firmware update capability included?
Yes. Firmware updates are delivered via USB drive or network download and installed through the ThermoCal Suite. Each release includes version-controlled changelogs and backward-compatible configuration migration.
Can the POTS-SLIM be integrated into an existing LIMS or MES environment?
Yes. SCPI command support, RESTful API extension modules, and OPC UA connectivity options enable seamless integration with laboratory information management systems and manufacturing execution systems under ISO/IEC 17025 or 21 CFR Part 11 frameworks.
