Desktop Temperature and Humidity Controlled Chamber – OK-TH Series (Customizable Internal Volume)

Overview

The OK-TH Series Desktop Temperature and Humidity Controlled Chamber is an engineered environmental test system designed for precise, repeatable simulation of thermal and hygrothermal conditions in laboratory and quality control settings. Based on forced-air convection with dual independent control loops—PID-regulated refrigeration and steam-based humidification—the chamber maintains stable setpoints across defined operational ranges. Its compact footprint and modular internal geometry support integration into benchtop workflows without compromising compliance with internationally recognized environmental testing standards. Unlike walk-in chambers, this desktop variant prioritizes rapid thermal response, spatial uniformity, and operator accessibility while retaining full traceability and audit-ready operation under GLP and ISO/IEC 17025-aligned laboratory practices.

Key Features

• Modular internal volume options: 80 L to 1000 L (OK-TH-80 through OK-TH-1000), configurable to accommodate user-specific sample dimensions and fixture requirements
• Four standard temperature range configurations: 0–150 °C (A), −20–150 °C (B), −40–150 °C (C), and −70–150 °C (D), enabling qualification testing from ambient to extreme low-temperature regimes
• Humidity control range: 20–98 %RH (standard); optional extended ranges of 5–98 %RH or 10–98 %RH available for specialized material aging or condensation studies
• Thermal performance: typical heating rate of 4.0 °C/min; cooling rate of 1.0 °C/min (measured under no-load, mid-chamber conditions per IEC 60068-3-5)
• Uniformity & stability: ±0.5 °C temperature uniformity and ±2.5 %RH humidity uniformity across working volume; temperature fluctuation ≤ ±2 °C, humidity fluctuation ≤ +2–3 %RH (as verified per ASTM E145 Annex A3)
• Control interface: high-resolution LCD touchscreen controller with real-time graphing, multi-language support (English/Chinese), programmable ramp-soak profiles, and event logging
• Construction: interior and exterior walls fabricated from SUS#304 stainless steel; insulated with high-density polyurethane foam (≥100 mm thickness) for thermal efficiency and condensation resistance
• Refrigeration system: hermetically sealed, low-noise, dual-stage compressor unit utilizing environmentally compliant refrigerants R404A (primary stage) and R23 (cascade stage for sub-zero models)
• Standard accessories: one 50 mm diameter cable port (gland-sealed), two adjustable stainless steel shelves, four locking casters, and four leveling feet

Sample Compatibility & Compliance

The OK-TH series accommodates a broad spectrum of physical samples—including electronic assemblies, polymer components, pharmaceutical packaging, optical lenses, and battery cells—without requiring modification to chamber integrity. Internal dimensions are fully customizable during order specification to ensure optimal airflow distribution and sensor placement per IEC 60068-3-5 guidelines. The chamber meets the technical requirements of multiple international test standards, including but not limited to: MIL-STD-810G Method 501.6 (High Temperature), Method 502.6 (Low Temperature), Method 507.5 (Humidity), IEC 60068-2-1 (Cold), IEC 60068-2-2 (Dry Heat), IEC 60068-2-78 (Steady-State Damp Heat), and IEC 60068-2-30 (Cyclic Damp Heat). All units undergo factory calibration against NIST-traceable reference instruments prior to shipment, with documentation provided for ISO/IEC 17025-accredited laboratories.

Software & Data Management

The embedded controller supports data logging at user-defined intervals (1 s to 60 min resolution) with storage capacity for ≥30 days of continuous 10-channel recording (temperature, humidity, alarms, setpoints, runtime). Export formats include CSV and PDF reports compatible with LIMS integration. Optional Ethernet or RS485 interfaces enable remote monitoring via SCADA systems or enterprise lab management platforms. For regulated environments, optional software packages provide 21 CFR Part 11-compliant features—including electronic signatures, audit trails, role-based access control, and password-protected parameter lockdown—ensuring full traceability during GMP or GLP audits.

Applications

• Accelerated aging of polymers and elastomers under controlled thermal-hygrometric stress
• Pre-conditioning of electronic components prior to HALT/HASS testing
• Stability testing of medical device packaging per ISO 11607
• Material compatibility assessment for adhesives, coatings, and composites
• Calibration verification of hygrometers and thermometers using fixed-point references
• Environmental stress screening of PCBAs and semiconductor devices
• Validation of desiccant performance and moisture barrier integrity

FAQ

Is the chamber suitable for continuous operation at −70 °C?
Yes—models configured with the D-range (−70 to 150 °C) utilize a cascade refrigeration system rated for uninterrupted operation at minimum setpoint, subject to ambient room conditions ≤25 °C and relative humidity ≤60 %RH.

Can I integrate external sensors or third-party data acquisition systems?
The chamber provides analog voltage outputs (0–10 VDC) for both chamber temperature and humidity signals, along with dry-contact alarm relays, enabling seamless integration with external DAQ hardware or PLCs.

What is the recommended maintenance schedule?
Compressor oil and refrigerant levels should be verified annually; humidity sensor calibration is advised every six months using saturated salt solutions or certified humidity generators. Full preventive maintenance is documented in the included service manual and aligns with ISO 55001 asset management principles.

Does the unit comply with CE or UKCA marking requirements?
All OK-TH series units shipped to EEA or UK markets carry CE/UKCA marking, supported by EU Declaration of Conformity referencing EN 61000-6-2 (immunity) and EN 61000-6-4 (emissions), as well as Machinery Directive 2006/42/EC.