OK Walk-in Constant-Temperature Environmental Laboratory OK-STH-8.00m²

Overview

The OK Walk-in Constant-Temperature Environmental Laboratory OK-STH-8.00m² is an engineered precision climate-controlled space designed to maintain a highly stable and spatially uniform thermal environment over extended operational cycles. Unlike rapid thermal transition chambers, this system operates on the principle of steady-state thermal equilibrium—achieving and sustaining target temperatures with minimal temporal drift and exceptional spatial consistency across its 8.00 m² internal volume. Its core architecture integrates high-performance insulation, laminar air distribution, and adaptive PID-based temperature regulation to serve as a reference-grade thermal infrastructure for calibration laboratories, long-duration product validation, controlled manufacturing staging, and ambient-conditioned storage of temperature-sensitive materials.

Key Features

• Structural integrity via 100 mm thick polyurethane insulated panels with seamless tongue-and-groove joints and vapor barrier lamination—ensuring thermal resistance (R-value) compliant with ISO 13788 for condensation control under extreme low-temperature operation.
• Optimized air circulation system featuring dual-directional centrifugal blowers, perforated plenum ducts, and adjustable flow diffusers—validated to deliver ≤±3°C temperature uniformity (per IEC 60068-3-5) at any point within the working volume at steady state.
• Modular refrigeration architecture: single-stage vapor compression for 0°C models; cascade refrigeration systems for −20°C to −70°C variants—each equipped with electronic expansion valves and redundant pressure safety cut-offs per ASME B31.5 requirements.
• Industrial-grade programmable logic controller (PLC) with 7-inch HMI touchscreen interface, supporting multi-segment ramp-soak profiles, real-time deviation logging, and configurable alarm thresholds for over-temperature, under-temperature, door-open duration, and sensor fault conditions.
• Full compliance with CE machinery directive (2006/42/EC), EMC directive (2014/30/EU), and RoHS 2011/65/EU—certified by TÜV Rheinland for electrical safety and functional reliability.

Sample Compatibility & Compliance

The OK-STH-8.00m² accommodates full-scale equipment under test—including automotive ECUs, medical device packaging batches, aerospace avionics assemblies, and pharmaceutical stability samples—without requiring disassembly or environmental compromise. Its interior dimensions (2000 × 2000 × 2000 mm) support standard palletized loads and permit operator ingress for manual intervention or instrumentation setup. All configurations meet ASTM E145-22 Class II chamber performance criteria for uniformity and stability. For GLP/GMP-regulated environments, optional 21 CFR Part 11-compliant audit trail modules are available, enabling electronic signature-capable data archiving, user role-based access control, and immutable event logs traceable to NIST-traceable reference thermistors.

Software & Data Management

Standard firmware includes embedded Ethernet (TCP/IP) and RS-485 Modbus RTU connectivity for integration into facility-wide SCADA or MES platforms. Optional OK-EnviroLink™ software provides remote monitoring, automated report generation (PDF/CSV), historical trend analysis with deviation heatmaps, and scheduled calibration reminders. Data acquisition records temperature at 1-second intervals from up to six independently calibrated PT100 sensors (Class A tolerance per IEC 60751), with timestamps synchronized to UTC via NTP. All raw datasets are exportable in SI-unit-aligned formats compatible with JMP, MATLAB, and Qualtrics statistical validation workflows.

Applications

• Long-term stability testing of lithium-ion battery modules per UN 38.3 Section 40.3 and IEC 62660-2:2018.
• Reference environment for metrological calibration of thermocouples, RTDs, and infrared pyrometers (ISO/IEC 17025 accredited labs).
• Controlled aging studies of polymer composites and elastomers under ISO 188:2018 accelerated thermal exposure protocols.
• Pre-conditioning of optical components prior to interferometric measurement in cleanroom-adjacent installations.
• Environmental hold phase in HALT/HASS test sequences where thermal soak stability—not rate—is the critical success metric.

FAQ

What distinguishes this chamber from walk-in thermal shock or rapid temperature transition systems?
This laboratory is engineered for thermal steadiness—not speed. It prioritizes spatial uniformity (±3°C) and temporal stability (±1°C over 24 h), whereas rapid-transition chambers emphasize heating/cooling rates (>10°C/min) at the expense of uniformity and long-term drift control.
Can the chamber be validated per IQ/OQ/PQ protocols?
Yes. Factory-installed NIST-traceable sensor ports, documented uncertainty budgets (<0.15°C k=2), and FAT/SAT documentation packages support full GAMP 5-aligned qualification for regulated industries.
Is remote diagnostics and preventive maintenance supported?
All units include embedded SNMP v3 agents and predictive fault indicators for compressor oil pressure, fan current draw, and defrost cycle efficiency—accessible via secure HTTPS portal with TLS 1.2 encryption.
What power supply and utility requirements apply for the −70°C configuration?
The E-series variant requires three-phase 380 VAC ±10%, 50 Hz, with minimum 63 A circuit protection and dedicated chilled water supply (7–12°C, 2.5 m³/h) for condenser cooling.
Are custom interior modifications—such as pass-through ports or integrated power feeds—available?
Yes. OK Instruments offers engineering-led customization including ISO 14644-1 Class 7 cleanroom-compatible interiors, EMI-shielded feedthroughs, and explosion-proof lighting per ATEX Directive 2014/34/EU.