OK Instruments OK-HL-100 High-Low Temperature Environmental Test Chamber

Overview

The OK Instruments OK-HL-100 High-Low Temperature Environmental Test Chamber is an engineered thermal stress testing system designed for rigorous evaluation of material and product performance under controlled extreme temperature conditions. Based on forced-air convection and dual-stage compressor refrigeration (R404A/R23), the chamber delivers stable, repeatable thermal profiles across a wide operational range of −70 °C to +150 °C. Its architecture adheres to fundamental principles of environmental simulation: precise thermal energy transfer via high-efficiency heat exchangers, minimized thermal inertia through optimized airflow distribution, and robust thermal isolation using high-density polyurethane insulation (≥100 mm thickness). The chamber serves as a core validation tool in development and quality assurance workflows—particularly where thermal cycling, cold soak, or high-temperature endurance testing is mandated by industry standards such as IEC 60068-2-1 (cold tests), IEC 60068-2-2 (dry heat), MIL-STD-810H Method 502.7, and ASTM D3418.

Key Features

• Industrial-grade hermetic compressors (European-manufactured, low-noise design) enabling reliable long-term operation at cryogenic temperatures down to −70 °C
• Dual-wall construction with SUS#304 stainless steel interior and exterior chambers—resistant to oxidation, corrosion, and thermal fatigue
• High-resolution color touchscreen controller with real-time graphing, programmable ramp/soak profiles, and dual-language interface (English/Chinese)
• Multi-layer tempered observation window with integrated conductive ITO film—ensures electrostatic discharge (ESD)-safe visibility without condensation or fogging
• Single Ø50 mm test port positioned on the left side, sealed with high-temperature silicone gasket for external signal/power line routing
• Comprehensive safety architecture: independent over-temperature cut-out, compressor high-pressure protection, phase failure detection, and automatic emergency shutdown with on-screen fault diagnostics
• Adjustable stainless steel shelves (2 included), leveling casters with locking mechanism, and adjustable leveling feet for stable installation on non-uniform floors

Sample Compatibility & Compliance

The OK-HL-100 accommodates a broad spectrum of test specimens—from printed circuit boards (PCBs) and automotive ECUs to polymer composites, lithium-ion battery modules, aerospace fasteners, and coated metal substrates. Its internal volume (0.1 m³) supports standard sample mounting fixtures per IPC-TM-650 2.6.7 and JEDEC JESD22-A104E. The chamber’s thermal uniformity (±2.0 °C) and stability (±0.5 °C fluctuation) meet the spatial and temporal repeatability requirements outlined in ISO 17025-accredited calibration protocols for environmental test equipment. While not intrinsically explosion-proof, the unit complies with CE machinery directive (2006/42/EC) and RoHS 2011/65/EU for restricted substances. Optional humidity integration (not included in base model) enables combined temperature-humidity stress testing aligned with IEC 60068-2-30.

Software & Data Management

The embedded controller logs all operational parameters—including chamber setpoint, actual temperature, compressor status, alarm history, and cycle timestamps—at user-defined intervals (1–60 sec resolution). Data export is supported via USB 2.0 port (CSV format) for traceability and post-processing in Excel or statistical analysis platforms (e.g., Minitab, JMP). Audit trail functionality records operator login events, parameter modifications, and manual overrides—supporting GLP/GMP documentation requirements. Although the base firmware does not include network connectivity or remote monitoring, optional RS-485 Modbus RTU or Ethernet TCP/IP modules enable integration into centralized lab management systems compliant with FDA 21 CFR Part 11 for electronic records and signatures.

Applications

• Thermal shock screening of avionics components per DO-160 Section 4.5
• Accelerated aging of elastomeric seals and gaskets under cyclic low-temperature embrittlement
• Pre-conditioning of lithium-ion cells prior to electrical performance characterization (UN 38.3 T1–T5)
• Validation of adhesive bond integrity in structural automotive assemblies exposed to seasonal thermal extremes
• Stability assessment of pharmaceutical packaging materials per USP and ICH Q1A(R2)
• Qualification testing of industrial sensors operating in outdoor or unheated warehouse environments

FAQ

What is the standard warranty coverage for the OK-HL-100?

The unit includes a 24-month parts-and-labor warranty covering manufacturing defects in materials and workmanship, excluding consumables (e.g., door gaskets) and damage from improper installation or misuse.
Can the chamber be calibrated to NIST-traceable standards?

Yes—OK Instruments provides optional factory calibration with certificate traceable to national metrology institutes (e.g., CNAS-accredited labs in China; equivalent to UKAS/NIST). On-site calibration services are available upon request.
Is remote monitoring possible without upgrading the controller?

No—the base controller lacks built-in Ethernet or Wi-Fi. Remote access requires retrofitting with the optional communication module and compatible SCADA or LabVIEW driver.
What maintenance is required to sustain thermal accuracy over time?

Quarterly inspection of condenser coils, annual verification of door seal compression force, and biannual recalibration of temperature sensors using reference-grade PRTs are recommended per ISO/IEC 17025 maintenance guidelines.
Does the chamber support custom test profiles beyond standard ramps?

Yes—the controller supports up to 100 programmable segments per profile, including step, ramp, soak, and loop functions—enabling complex multi-step sequences such as thermal cycling with dwell periods and variable ramp rates.