MOCON OX-TRAN® Model 2/22 Oxygen Transmission Rate Analyzer

Overview

The MOCON OX-TRAN® Model 2/22 Oxygen Transmission Rate (OTR) Analyzer is a fully automated, dual-chamber gravimetric-permeation instrument engineered for high-precision measurement of oxygen permeability through flexible packaging films, laminates, and rigid containers. It operates on the principle of coulometric detection—where oxygen molecules permeating through a test specimen are quantitatively reduced at a gold cathode in an electrolytic cell, generating a current directly proportional to the molar flux of O₂ (in accordance with Faraday’s law). This absolute measurement method eliminates the need for calibration standards or reference gases, ensuring long-term stability and traceability to NIST-certified reference materials. Designed for compliance with ASTM D3985 (standard test method for oxygen gas transmission rate through plastic film and sheeting using a coulometric sensor), ISO 15105-2, and pharmacopoeial requirements (e.g., YBB 00082003, USP ), the Model 2/22 delivers metrologically robust data essential for barrier validation in regulated environments—including pharmaceutical primary packaging, sterile medical device pouches, and shelf-life-critical food packaging.

Key Features

• Dual independent 50 cm² test chambers enabling parallel or comparative testing under identical or divergent environmental conditions
• Coulox® coulometric sensor—patented, drift-free, self-calibrating, with >10-year operational life and no consumable electrolytes
• TruSeal™ dynamic nitrogen purge seal technology: continuous peripheral N₂ sweep prevents ambient O₂ ingress at chamber edges, critical for sub-0.1 cc/(m²·day) measurements
• Fully automated parameter orchestration: simultaneous real-time control of temperature (10–40 °C ±0.2 °C), relative humidity (0–90% RH, independently adjustable on both sides), carrier gas pressure, and flow rate
• Intelligent equilibrium detection algorithm reduces test duration by up to 40% versus fixed-time protocols—especially effective for high-permeability samples (≥2.0 cc/(m²·day)) where zero-step elimination is permitted
• Pneumatic sample clamping with horizontal chamber orientation ensures rapid, reproducible sealing and minimizes operator-induced variability
• Onboard embedded computer with intuitive touchscreen interface; optional remote operation via PermNet® Lite software over Ethernet or USB
• Integrated calendar, audit trail logging, and sensor protection logic (over-pressure, over-humidity, and current-limiting circuits) enhance system longevity and reduce TCO

Sample Compatibility & Compliance

The Model 2/22 accommodates flat film specimens (10.8 cm × 10.8 cm) and rigid or semi-rigid packages up to 3 L volume (with optional package test conversion chamber). Its dual-side RH control supports asymmetric humidity profiles—essential for simulating real-world storage conditions (e.g., dry interior vs. humid ambient). The instrument meets GLP/GMP data integrity requirements: all test parameters, raw sensor outputs, timestamps, and user actions are automatically timestamped and stored with immutable digital signatures. Full 21 CFR Part 11 compliance is achievable when deployed with validated PermNet® Lite software—including electronic signatures, role-based access control, and audit-ready report generation. Regulatory submissions supported include FDA IND/NDA filings, EMA Annex 1 documentation, and China NMPA packaging compatibility dossiers.

Software & Data Management

Data acquisition, analysis, and reporting are managed through either the onboard touchscreen UI or the optional PermNet® Lite platform. Raw coulometric current traces, calculated OTR values, equilibrium curves, and environmental logs are stored in vendor-neutral CSV and PDF formats. Built-in statistical tools compute mean, SD, CV%, and confidence intervals per ASTM E29. Exported datasets integrate seamlessly with LIMS (e.g., LabWare, Thermo Fisher SampleManager) and QMS platforms (e.g., MasterControl, Veeva Vault). Remote diagnostics enable MOCON-certified engineers to perform firmware updates, sensor health assessments, and troubleshooting without onsite visits—minimizing instrument downtime.

Applications

• Pharmaceutical packaging: OTR validation of blister foils, cold-forming aluminum laminates, and polymer-coated vials per ICH Q5C and USP
• Medical device sterilization packaging: Quantification of O₂ ingress into Tyvek®-based pouches and peel-open trays for ethylene oxide and gamma sterilization cycle qualification
• Food packaging R&D: Barrier performance mapping of metallized PET, SiOₓ-coated films, and multilayer coextrusions under accelerated aging conditions
• Resin & additive development: Correlation of OTR with polymer crystallinity, plasticizer content, and nanofiller dispersion using controlled RH/temperature ramps
• Regulatory stability studies: Supporting ICH Q1A(R3) photostability and accelerated stability protocols where O₂ sensitivity is a critical degradation pathway

FAQ

Does the OX-TRAN® Model 2/22 require daily calibration?
No. The Coulox® coulometric sensor is an absolute measurement device governed by Faraday’s law; it requires no routine calibration. NIST-traceable verification is performed during annual service or as part of IQ/OQ/PQ protocols.
Can the instrument test both film and package formats without hardware modification?
Yes—film testing uses the standard dual-chamber configuration; package testing requires the optional Package Test Conversion Chamber accessory, which replaces one film chamber with a sealed headspace vessel.
What humidity control precision is achieved during asymmetric RH testing?
Each side maintains setpoint accuracy within ±1.5% RH across the full 0–90% range, verified per ISO 15105-2 Annex B using chilled-mirror hygrometry.
Is data export compatible with FDA-submission-ready formats?
Yes—CSV exports include raw current, time, temperature, RH, and calculated OTR with metadata. When used with PermNet® Lite under 21 CFR Part 11 configuration, full electronic record/electronic signature (ERES) compliance is achieved.
How does TruSeal™ improve low-level OTR measurement reliability?
By maintaining a continuous nitrogen curtain around the test cavity perimeter, TruSeal™ suppresses edge diffusion artifacts that dominate error budgets below 0.1 cc/(m²·day), thereby extending the validated lower detection limit to 0.05 cc/(m²·day) with ≤1% RSD.