Cryo-77Pro 800K Liquid Nitrogen Cryostat
| Brand | Orient KOJI |
|---|---|
| Temperature Range | 77 K to 800 K |
| Temperature Stability | ±0.1 K |
| Liquid Nitrogen Capacity | 2 L |
| Hold Time at 78 K | 4 h |
| Compatible Spectrometers | HORIBA FluoroMax, Edinburgh Instruments FLS980/FLS1000, Hitachi F-7000 |
| Origin | Tianjin, China |
Overview
The Cryo-77Pro 800K Liquid Nitrogen Cryostat is an engineered thermal control platform designed for high-precision spectroscopic measurements under cryogenic to elevated temperature conditions. Based on a dual-mode liquid nitrogen cooling and resistive heating architecture, it enables stable, programmable temperature control across a continuous range from 77 K (liquid nitrogen boiling point) to 800 K—covering critical regimes for low-temperature photoluminescence, temperature-dependent absorption, and thermally activated energy transfer studies. Unlike single-stage cryostats limited to sub-ambient operation, the Cryo-77Pro integrates a vacuum-jacketed sample chamber, multi-layer radiation shielding, and active PID-regulated heating elements to ensure uniform thermal distribution and minimal thermal drift. Its open-platform design supports direct optical access through orthogonal quartz windows (standard AR-coated for UV–NIR transmission), making it suitable for integration into commercial fluorescence spectrometers without requiring proprietary mechanical interfaces.
Key Features
- Wide operational temperature span: 77 K–800 K with <±0.1 K short-term stability (measured over 30 min at setpoint, under static vacuum and ambient lab conditions)
- 2 L liquid nitrogen reservoir enabling ≥4 hours of continuous operation at 78 K; refill port accessible without breaking vacuum or interrupting measurement
- Vacuum-tight stainless steel chamber with integrated radiation shields and conduction-limited cold finger design to minimize heat load and maximize thermal efficiency
- Standard optical configuration: two perpendicular 25 mm clear-aperture quartz viewports (UV-grade fused silica, 190–2500 nm AR coating)
- Modular flange system compliant with CF-35 and ISO-KF25 standards for rapid integration with spectrometer sample compartments
- Onboard digital controller with RS-232 and USB interfaces; supports external trigger synchronization and analog voltage input for external temperature ramping protocols
Sample Compatibility & Compliance
The Cryo-77Pro accommodates standard spectroscopic sample formats including 10 mm × 10 mm cuvettes, solid-state pellets (up to Ø25 mm × 5 mm), thin-film substrates, and fiber-coupled probes. Sample mounting is facilitated via a removable copper cold stage with threaded M4 and M6 holes for custom fixture integration. All internal materials—including O-rings (Viton®), gasketing, and thermal interface compounds—are selected for ultra-low outgassing and compatibility with high-vacuum environments (base pressure ≤5×10⁻⁶ mbar). The system conforms to CE safety directives for laboratory equipment and meets electromagnetic compatibility (EMC) Class B requirements. While not certified to ISO/IEC 17025 or GLP as a standalone instrument, its temperature calibration traceability aligns with NIST-traceable Pt100 sensors (Class A tolerance per IEC 60751), supporting audit-ready documentation in regulated R&D environments.
Software & Data Management
Orient KOJI provides the CryoControl Suite—a Windows-based application enabling real-time temperature monitoring, multi-step ramp/soak programming, and synchronized data logging with external spectrometers via TTL triggers or analog voltage output. The software exports timestamped CSV files containing temperature, heater power, LN₂ level (via capacitive sensor), and user-defined metadata fields. Audit trail functionality records all parameter changes, operator logins, and system events—supporting basic 21 CFR Part 11 compliance when deployed on validated networked workstations. API support (DLL and LabVIEW VI libraries) allows integration into custom Python- or MATLAB-driven automation frameworks for high-throughput screening applications.
Applications
- Temperature-resolved photoluminescence quantum yield (PLQY) mapping of perovskite thin films and quantum dots
- Exciton binding energy determination in 2D semiconductors via variable-temperature absorption edge analysis
- Thermal quenching kinetics modeling in phosphor materials used in solid-state lighting
- Low-temperature Raman spectroscopy of superconducting oxides and topological insulators
- In situ fluorescence lifetime imaging (FLIM) of biological chromophores under controlled thermal stress
FAQ
Can the Cryo-77Pro be operated under high vacuum or UHV conditions?
Yes—the chamber is rated for ≤1×10⁻⁷ mbar when equipped with optional all-metal seals and bake-out compatible components. Standard configuration uses Viton® seals rated to 1×10⁻⁶ mbar.
Is liquid helium cooling supported?
No—this model is optimized for liquid nitrogen cooling only. For sub-77 K operation, Orient KOJI offers the Cryo-4K series with closed-cycle cryocooler integration.
What spectrometer coupling kits are available off-the-shelf?
Pre-engineered adapters are supplied for HORIBA FluoroMax-4/FluoroMax-5, Edinburgh FLS980/FLS1000, and Hitachi F-7000. Custom couplers for Zeiss, JASCO, and custom-built systems are available upon request with mechanical drawings.
Does the system include temperature calibration certificates?
Each unit ships with a factory calibration report referencing NIST-traceable Pt100 sensor verification at 77 K, 298 K, and 573 K. Optional third-party calibration (e.g., by UKAS-accredited labs) can be arranged.
How is condensation prevented on optical windows during warm-up cycles?
A purge gas inlet (N₂ or dry air) is integrated adjacent to each viewport; recommended flow rate is 0.5–1.0 L/min to maintain dew point below –40 °C during transition through the 200–300 K range.
