MOCON AQUATRAN-W 3/38 H Photovoltaic Backsheet Water Vapor Transmission Rate (WVTR) Analyzer
| Brand | MOCON |
|---|---|
| Origin | USA |
| Model | AQUATRAN-W 3/38 H |
| Application | PV Backsheet & Encapsulant Barrier Testing |
| Compliance | ASTM F1249 |
| Detection Range | 0.05–200 g/(m²·day) |
| Sensor Type | Patented Modulated Infrared Detector |
| Chamber Configuration | Dual removable test cells (4 samples per run) |
| Control System | Fully automated temperature, RH, and carrier gas flow |
| Sealing Technology | TruSeal nitrogen purge ring |
| Measurement Principle | Modulated IR detection of water vapor in carrier gas stream |
Overview
The MOCON AQUATRAN-W 3/38 H is a high-precision, laboratory-grade water vapor transmission rate (WVTR) analyzer engineered specifically for the evaluation of barrier performance in photovoltaic (PV) backsheet materials, encapsulants, and edge-seal systems. It operates on the principle of modulated infrared (IR) spectroscopy — a highly selective and stable detection method that quantifies water vapor concentration in a dry nitrogen carrier gas stream after permeation through the test specimen. Unlike traditional coulometric or gravimetric methods, the AQUATRAN-W’s patented modulated IR sensor eliminates baseline drift and significantly reduces zero-point calibration frequency, enabling rapid, high-reproducibility measurements critical for R&D and QC environments in solar manufacturing. Designed to meet the stringent demands of long-lifetime PV modules—targeting operational stability beyond 25 years—the instrument delivers trace-level sensitivity down to 0.05 g/(m²·day), making it suitable for both ultra-high-barrier fluoropolymer backsheets and emerging low-cost polymer alternatives.
Key Features
- Patented modulated infrared sensor compliant with ASTM F1249–22, ensuring regulatory alignment and inter-laboratory data comparability
- Ultra-low detection limit of 0.05 g/(m²·day), validated across humidity gradients from 10% to 90% RH and temperatures up to 60 °C
- Dual independent test chambers with quick-release fixtures—enabling simultaneous analysis of four specimens without cross-contamination
- Fully automated environmental control: precise regulation of sample-side RH (±0.5% RH), temperature (±0.1 °C), and nitrogen flow rate (±0.5 sccm)
- TruSeal nitrogen ring technology minimizes edge leakage and eliminates mandatory zero-gas purging, reducing cycle time by up to 40%
- Integrated touchscreen interface with preloaded test methods for IEC 61215, UL 1703, and PVQAT-1 compliance protocols
Sample Compatibility & Compliance
The AQUATRAN-W 3/38 H accommodates rigid and flexible PV backsheet laminates—including PET-based, fluoropolymer-coated (e.g., TPT, TPE), and polyolefin alternatives—as well as ethylene-vinyl acetate (EVA), POE, and silicone encapsulants. Specimen sizes range from 100 mm × 100 mm to full-sheet coupons (up to 300 mm × 300 mm with optional fixtures). All test configurations adhere to ISO 15106-3, ASTM F1249, and JIS K 7129 methodologies. Data output meets GLP/GMP documentation requirements, with full audit trails, user access levels, and electronic signatures compatible with FDA 21 CFR Part 11–compliant software packages (available as optional upgrade).
Software & Data Management
Instrument control and data acquisition are managed via MOCON’s proprietary BarrierSuite™ v5.2 software. The platform supports real-time WVTR curve visualization, statistical process control (SPC) charting, batch reporting, and export to CSV, PDF, or LIMS-compatible XML formats. Each measurement includes timestamped metadata: chamber conditions, sensor diagnostics, seal integrity verification, and raw IR signal stability metrics. For integrated quality systems, BarrierSuite offers API-driven connectivity to enterprise MES and SAP QM modules, enabling automatic release decisions based on predefined WVTR acceptance thresholds (e.g., <0.5 g/(m²·day) for Class A backsheets per IEC TS 62788-2-1).
Applications
- Accelerated lifetime modeling of PV module encapsulation systems under damp heat (IEC 61215-2 MQT10)
- Comparative screening of new fluoropolymer coatings, SiOx/AlOx barrier layers, and nanocomposite films
- Root-cause analysis of field-failure incidents linked to moisture ingress at junction boxes or frame interfaces
- Validation of adhesive bond-line integrity during lamination process development
- Supplier qualification testing per PVQAT-1 Annex B specifications for backsheet WVTR stability after UV + thermal cycling
FAQ
Does the AQUATRAN-W 3/38 H measure oxygen transmission rate (OTR) as well?
No — this model is dedicated to WVTR only. For simultaneous OTR/WVTR characterization, MOCON recommends the PERMATRAN-W 3/38 H paired with an OX-TRAN system in tandem configuration.
Can it test textured or embossed backsheets?
Yes — the dual-chamber design includes adjustable clamping force and conformal gasketing to accommodate surface topographies up to 150 µm peak-to-valley deviation.
Is ASTM F1249 the only applicable standard?
While ASTM F1249 is the primary reference, the system’s measurement physics and calibration traceability also support ISO 15106-3 and GB/T 21528–2008 equivalency assessments.
How often does the IR sensor require recalibration?
Under normal operation with daily system checks, sensor recalibration is recommended every 12 months; MOCON provides NIST-traceable water vapor standards and on-site certification services.
What sample preparation steps are required prior to testing?
Specimens must be conditioned at 23 °C/50% RH for ≥48 h per ASTM D618, with clean-cut edges and no visible pinholes or delamination — verified via helium leak testing if required.
