OKO Mask Preconditioning Environmental Chamber for Temperature and Humidity Conditioning
| Brand | OKO Instruments |
|---|---|
| Origin | Imported |
| Manufacturer Type | Authorized Distributor |
| Price | USD 2,650 (Reference Only – Final Quotation Subject to Technical Configuration and Compliance Requirements) |
Overview
The OKO Mask Preconditioning Environmental Chamber is a precision-engineered temperature- and humidity-controlled test chamber specifically designed to meet the stringent preconditioning requirements defined in major respiratory protective equipment standards. It operates on a dual-loop PID-controlled refrigeration and humidification system, enabling stable, repeatable conditioning of respirators and face masks under specified ambient conditions prior to filtration efficiency, breathability, or fit testing. The chamber maintains tight control over temperature (±0.3 °C) and relative humidity (±2 % RH) across its working volume—critical for ensuring measurement reproducibility in accordance with ISO/IEC 17025-accredited laboratories. Its architecture complies with the thermal and hygric stability criteria outlined in GB 2626–2019 (Clause 6.5–6.6), GB/T 32610–2016, and GB 2890–2009 (Clause 6.9), supporting regulatory validation workflows for QC/QA departments and third-party certification labs.
Key Features
- Programmable multi-segment conditioning profiles: 120 programmable programs, each supporting up to 999 time–temperature–humidity segments
- Dual-mode operation: Independent selection of cooling-only, heating-only, or combined thermo-hygrometric conditioning
- Advanced controller interface with RS-232 serial communication for remote program upload, real-time monitoring, and automated chamber start/stop via PC-based software
- Comprehensive safety architecture: Dual-stage over-temperature/over-humidity cut-off, dry-run protection for humidifier, phase-loss detection, ground-fault interruption, water-level monitoring, and non-fuse circuit breakers
- Operational resilience: Power-loss memory retention for up to 6 months; resume-from-interruption capability with timestamped event logging
- User-calibration support: Adjustable sensor offset correction for both temperature and humidity transducers; optional traceable calibration certificate available per ISO/IEC 17025 Annex A.2
- Flexible timing logic: Programmable hold, jump-to-segment, standby mode, and dual independent time-triggered digital outputs for external device synchronization (e.g., particle counter activation)
Sample Compatibility & Compliance
The chamber accommodates standard mask configurations—including flat-fold, cup-shaped, and valved respirators—on adjustable stainless-steel sample racks without airflow obstruction. Internal dimensions (W × D × H: 600 × 500 × 650 mm) provide sufficient volume for simultaneous conditioning of multiple test specimens per IEC 60601-2-69 and ASTM F2299 protocols. All operational parameters are traceable to NIST-traceable reference standards. The system supports full audit readiness for GLP and GMP environments, with optional 21 CFR Part 11-compliant electronic signatures, user-access controls, and immutable audit trails when integrated with OKO’s LabControl Suite v4.x.
Software & Data Management
OKO LabControl Suite (Windows-based) enables full lifecycle management of preconditioning cycles: from defining multi-step RH/°C ramps and dwell periods to exporting timestamped CSV logs with sensor diagnostics. Data export includes raw sensor values, setpoint deviations, alarm timestamps, and power-event markers. The software supports configurable report templates aligned with CNAS-CL01:2018 reporting requirements and exports PDF reports with embedded digital signatures. Optional integration with LIMS platforms (via HL7 or REST API) allows automatic transfer of conditioning metadata into quality records.
Applications
- Pre-test environmental equilibration of filtering facepieces per GB 2626–2019 Section 6.5 (23 ±1 °C, 50 ±5 % RH, ≥24 h)
- Conditioning of daily-use masks per GB/T 32610–2016 Annex B prior to differential pressure and filtration efficiency evaluation
- Stability assessment of elastomeric respirator components under accelerated aging protocols (e.g., 40 °C / 90 % RH for 7 days)
- Calibration verification of secondary humidity sensors using saturated salt solutions inside the chamber workspace
- Supporting ISO 16900-1:2015 breathing resistance testing by maintaining upstream conditioning stability during flow-dynamic measurements
FAQ
Does this chamber comply with GB 2626–2019 Clause 6.6 for post-conditioning handling procedures?
Yes—the chamber’s rapid stabilization (<15 min to reach target RH at 23 °C) and low spatial gradient (<0.5 °C and <3 % RH deviation across load zone) satisfy the uniformity and recovery time stipulations in Clause 6.6.
Can the RS-232 interface be upgraded to Ethernet or USB for modern lab networks?
An optional RS-232-to-Ethernet converter module is available (model EC-NET-1), enabling Modbus TCP communication and seamless integration with SCADA or MES systems.
Is traceable calibration documentation included with shipment?
A factory calibration report (covering PT100 and capacitive RH sensor performance at three points) is supplied. Full ISO/IEC 17025 calibration with uncertainty budgets is available as an add-on service.
What is the maximum allowable load volume without compromising chamber stability?
For guaranteed compliance with ±0.3 °C / ±2 % RH specifications, total sample mass should not exceed 8 kg, and solid surface area exposed to airflow must remain below 0.8 m².
