ISOTECH Fixed-Point Blackbody Calibrator
| Brand | ISOTECH |
|---|---|
| Origin | United Kingdom |
| Model | ISOTECH Fixed-Point Blackbody Series (Indium, Zinc, Aluminum, Silver, Copper Points) |
| Cavity Diameter | 10 mm |
| Cavity Depth | 90 mm |
| Emissivity | >0.999 |
| Plateau Duration | >3 hours |
| Temperature Range | 156.60 °C (In) to 1084.62 °C (Cu) |
| High-Temperature Operation | Requires inert gas purge (N₂ or Ar) for Al/Ag/Cu points |
| R999 Mid-Temperature Reference Source | 30–550 °C, Cavity Ø45 mm × 285 mm depth |
| R426 High-Temperature Calibration Furnace | Sodium heat-pipe design, axial temperature gradient <0.01 °C/cm |
Overview
The ISOTECH Fixed-Point Blackbody Calibrator is a primary-standard reference source engineered for high-accuracy calibration of radiation thermometers, infrared pyrometers, and thermal imagers. Based on the thermodynamic principle of phase-change equilibrium, each unit realizes a highly reproducible temperature plateau by maintaining a pure metal (e.g., In, Zn, Al, Ag, Cu) at its defined triple-point or freezing point under controlled atmospheric conditions. The cylindrical cavity—precision-machined from high-purity graphite or refractory metal—is designed to achieve near-ideal blackbody behavior: deep cavity geometry (10 mm diameter × 90 mm depth), optimized aspect ratio (>9:1), and surface treatment yielding emissivity ≥0.999. This configuration minimizes reflected radiation and ensures spectral radiance closely approximates Planck’s law, enabling traceable calibration in accordance with ISO/IEC 17025, ASTM E2758, and the International Temperature Scale of 1990 (ITS-90). Units are manufactured in the UK to stringent metrological tolerances and certified per NPL or NIST-traceable protocols.
Key Features
- Primary-standard fixed-point realization for ITS-90-defined temperatures: Indium (156.60 °C), Zinc (419.53 °C), Aluminum (660.32 °C), Silver (961.78 °C), and Copper (1084.62 °C)
- Cavity emissivity ≥0.999, verified via absolute reflectance measurement and validated against cavity radiation models
- Stable thermal plateau duration exceeding 3 hours, supporting full uncertainty budgeting per EURAMET cg-18 guidelines
- R999 mid-temperature reference source (30–550 °C) with Ø45 mm × 285 mm cavity—optimized for large-aperture IR sensor calibration
- R426 high-temperature furnace featuring sodium heat-pipe technology, delivering axial temperature uniformity <0.01 °C/cm across the calibration zone
- Inert gas purging capability (N₂ or Ar) integrated into Al/Ag/Cu units to prevent oxidation and ensure long-term stability of the fixed-point material
Sample Compatibility & Compliance
The ISOTECH Fixed-Point Blackbody series supports calibration of all non-contact radiation thermometers operating in spectral bands from 0.7 µm to 14 µm—including narrowband, broadband, and ratio pyrometers. Each fixed-point unit complies with ISO 5725 (accuracy, repeatability, reproducibility), IEC 60584-2 (thermocouple reference tables), and supports GLP/GMP audit requirements through documented traceability chains. All units ship with full calibration certificates indicating measurement uncertainty (k=2), reference standard used (e.g., NPL S101), and environmental conditions during verification. For FDA-regulated applications, the system supports 21 CFR Part 11-compliant electronic records when paired with ISOTECH’s optional data acquisition software.
Software & Data Management
ISOTECH provides dedicated calibration management software compatible with Windows 10/11, enabling automated plateau detection, real-time deviation monitoring, and uncertainty propagation per GUM (JCGM 100:2008). The software logs timestamped cavity temperature profiles, plateau onset/offset identification, and deviation thresholds—exportable as CSV or PDF reports compliant with ISO/IEC 17025 clause 7.8. Optional integration with LabWare LIMS or Thermo Fisher SampleManager enables direct audit-trail linkage. Firmware updates are delivered via secure HTTPS channel; all software modules undergo annual validation per IQ/OQ protocols.
Applications
- Primary calibration of industrial infrared thermometers used in steel, glass, and semiconductor manufacturing
- Validation of thermal imaging systems in aerospace NDT and power plant condition monitoring
- Reference source for national metrology institutes performing inter-laboratory comparisons (e.g., CCT-K3, CCT-K8)
- Uncertainty reduction in high-temperature process control loops (e.g., annealing furnaces, sintering ovens)
- Supporting ISO 9001 and AS9100 quality audits requiring documented temperature measurement traceability
- Research-grade characterization of detector responsivity and spectral response functions
FAQ
What inert gas is recommended for aluminum, silver, and copper fixed-point operation?
Nitrogen (N₂) or argon (Ar) at ≥99.998% purity is required; flow rate must maintain positive pressure (≥100 mL/min) throughout the plateau phase to suppress oxide formation.
Can the R999 and R426 furnaces be used interchangeably with all fixed-point cells?
No—the R999 is dimensionally optimized for mid-temperature cells (In, Zn, Sn); the R426’s heat-pipe architecture and higher thermal mass are mandatory for Al/Ag/Cu points due to their elevated melting enthalpy and thermal conductivity requirements.
Is emissivity verification performed per unit before shipment?
Yes—each cavity undergoes absolute hemispherical emissivity measurement using a calibrated FTIR spectroradiometer at three wavelengths (1.0 µm, 3.9 µm, 10 µm), with results reported in the certificate of calibration.
Does ISOTECH provide on-site installation and verification services?
Yes—certified metrologists offer IQ/OQ/PQ support, including cavity alignment verification, plateau stability assessment, and uncertainty budget review aligned with EURAMET cg-18.
How often does a fixed-point cell require re-certification?
Annually for routine use; every 6 months if operated >200 cycles/year or exposed to thermal shock—per ISO/IEC 17025 clause 6.6.2 on reference material stability monitoring.
