Labthink C230H Oxygen Transmission Rate (OTR) Tester – Coulometric Sensor-Based Isobaric Method System

Overview

The Labthink C230H Oxygen Transmission Rate (OTR) Tester is an isobaric, coulometric-sensor-based analytical system engineered for precise, reproducible quantification of oxygen permeation through polymeric films, rigid sheets, and packaged goods. It operates on the fundamental principle of differential gas partial pressure: oxygen diffuses across a conditioned test specimen under controlled temperature and relative humidity, then is carried by a high-purity nitrogen carrier stream to a coulometric oxygen sensor—where electrochemical reduction generates a current linearly proportional to O₂ concentration. This analog signal is digitized and processed in real time to calculate OTR values per ASTM D3985 and ISO 15105-2. Unlike manometric or volumetric methods, the coulometric approach delivers inherent zero-drift stability, minimal calibration drift, and immunity to ambient atmospheric fluctuations—making it the reference method for regulatory-grade barrier validation in pharmaceutical, food, and medical device packaging development.

Key Features

• Tri-chamber integrated test block engineered via computational fluid dynamics (CFD) and thermodynamic modeling to minimize inter-chamber thermal, hygral, and flow-path variance—ensuring <0.2 °C and <1% RH uniformity across all three test stations.
• Independent high-resolution温湿度 sensors (±0.2 °C, ±1% RH) mounted directly within each test chamber enable closed-loop feedback control of both temperature and humidity—critical for simulating real-world storage conditions per USP & ICH Q1 guidelines.
• Simultaneous parallel testing of up to three identical specimens (for statistical validation per ISO 5725) or three distinct materials under identical environmental parameters—reducing inter-test variability and accelerating method qualification.
• Automated climate conditioning: no manual humidifier refills or external chiller connections required. Integrated Peltier-based heating/cooling and ultrasonic humidification deliver stable setpoints from 10–55 °C and 0–100% RH.
• 12-inch industrial-grade Windows 10 touchscreen interface with dual-mode operation: “Quick Test” for routine QC (fully automated parameter loading, result export, pass/fail flagging) and “Advanced Mode” for R&D (custom ramp profiles, multi-step humidity transitions, transient OTR monitoring).
• DataShield™ software architecture compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, full audit trail (user action, timestamp, data modification history), role-based access control, and encrypted local/cloud backup.

Sample Compatibility & Compliance

The C230H accommodates flat sheet materials (films, foils, laminates, rubber sheets, silicon wafers) up to 108 mm × 108 mm and 3 mm thick, with standardized 50 cm² test area. Optional package testing module supports rigid and flexible containers up to 3 L volume—including PET bottles, aluminum cans, blister packs, pouches, and composite drums—using inverted or upright orientation per ASTM F1307. All hardware and firmware are validated against GMP Annex 11 and ISO/IEC 17025 documentation requirements. Calibration traceability is maintained to NIST-traceable O₂ standards, and instrument qualification protocols (IQ/OQ/PQ) are supplied as part of the GMP-compliant configuration package.

Software & Data Management

DataShield™ is a purpose-built laboratory information management system (LIMS)-ready platform supporting CSV, PDF, XML, and SQL export formats. It enforces ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) throughout the data lifecycle. Audit trails record every parameter change, test initiation, result override, and user login/logout event. Role-based permissions allow administrators to define operator, reviewer, and approver privileges. Optional integration with enterprise SAP QM, LabVantage, or Thermo Fisher SampleManager modules is supported via RESTful API and OPC UA protocol.

Applications

Primary applications include barrier performance verification of food packaging (e.g., vacuum-sealed meat trays, retort pouches), pharmaceutical primary packaging (cold-form blister cavities, HDPE prescription bottles, foil-laminated sachets), and medical device sterile barriers (Tyvek® pouches, peel-open trays). Extended use cases validated by end-users include solar backsheet OTR screening per IEC 61215, fuel tank permeation assessment per SAE J1708, lithium-ion battery enclosure integrity testing, and automotive headlamp lens fogging prediction models. The system also supports accelerated aging studies when coupled with Labthink’s TSO series thermal-humidity chambers.

FAQ

What gas purity is required for carrier nitrogen?
High-purity nitrogen ≥99.999% (5.0 grade) is mandatory; impurities >1 ppm O₂ or H₂O will compromise sensor baseline stability and measurement accuracy.
Can the C230H test metallized or aluminum-laminated films?
Yes—its coulometric sensor is insensitive to metal particulates or coating defects; however, pinhole-free sample mounting and edge sealing are essential to prevent bypass leakage.
Is third-party calibration certification available?
Yes—NIST-traceable calibration certificates issued by CNAS-accredited labs (ISO/IEC 17025) are available upon request, including uncertainty budgets per GUM guidelines.
How is compliance with 21 CFR Part 11 enforced?
DataShield™ implements electronic signature workflows with biometric or PKI-based authentication, immutable audit logs, and automatic session timeout—fully aligned with FDA guidance for computerized systems in regulated environments.
Does the system support custom test sequences for dynamic RH cycling?
Yes—Advanced Mode allows programmable multi-step humidity ramps (e.g., 0% → 75% → 0% RH over 24 h) to simulate seasonal storage conditions and assess moisture-dependent barrier degradation kinetics.