Humidity tester W3/062

temperaturewater vapor permeabilityair velocity

The W3/062 is a WVTR (water vapor transmission rate) test system based on the cup method for precise measurement of films and sheet materials. It combines automated weighing, controlled temperature/humidity and data management for laboratory and production testing.

Product features

• Cup‑method design: Gravimetric cup method for film and sheet WVTR measurements; high‑resolution weighing sensor (mass resolution 0.001 g) for sensitive detection.
• Supports both water (wet‑cup) and desiccant (dry‑cup) test methods.
• Wide‑range, high‑precision automatic temperature and humidity control to accommodate non‑standard test conditions.
• Standardized air velocity control to maintain a stable humidity differential across the specimen.
• Automatic reset before weighing and periodic weighing with gas‑cylinder lifting to reduce systematic errors.
• Fast‑access calibration ports for temperature and humidity; reference film or standard weight for quick calibration.

• High efficiency: Circular rack with 6 independent test dishes (6 specimens per run); expandable via satellite bases for up to 60 simultaneous tests.
• Intelligent: Windows‑based operating software with intuitive UI, multi‑format export, historical data search/compare/analyze/print and support for Lystem™ Lab Data Sharing System for centralized result management.

Principle
Under controlled test temperature a constant humidity difference is established between the two sides of the specimen. Water vapor permeates through the sample to the dry side; the system measures weight change of the test dish over time to calculate WVTR and related parameters.

Standards

• ISO 2528
• GB 1037
• GB/T 16928
• ASTM E96
• ASTM D1653
• TAPPI T464
• DIN 53122‑1
• JIS Z0208
• YBB 00092003

Applications

• Primary: Plastic films, composite films, paper‑plastic laminates, co‑extruded films, aluminized films, aluminum foil composites.
• Sheets: Engineering plastics, rubber, building materials (e.g. PP, PVC, PVDC).
• Paper & board: Foil‑laminated paper, packaging materials (Tetra Pak, cigarette foil).
• Textiles & nonwovens: Waterproof‑breathable fabrics, nonwovens for diapers and hygiene products.
• Extended: Medical films and accessories (dressings, wound‑protection films, masks), artificial skin, solar back‑sheets, LCD films, paint films, cosmetics packaging, biodegradable films.

Configurations

• Standard: Instrument, professional software, test dishes, desiccant tube, humidity generator, calibration weight, communication cable, round sample cutter, valve set.
• Optional: Satellite base, reference film, air compressor, desiccant.

Technical specifications

• Test range: 0.1–10,000 g/m2·24h (Water method); 0.1–2,500 g/m2·24h (Desiccant method).
• Number of specimens: 1–6 (independent results); expandable to up to 60 simultaneous tests via satellite bases.
• Accuracy (WVTR): 0.01 g/m2·24h.
• Mass resolution: 0.001 g (customizable).
• Temperature range: 15 °C–55 °C; temperature accuracy: ±0.1 °C.
• Humidity range: Water method: ∆RH 90%→70% (chamber RH ≈10%–30% accordingly); Desiccant method: ∆RH 10%→98% (depends on temperature).
• Humidity accuracy: ±1% RH.
• Air velocity: 0.5–2.5 m/s (customizable).
• Specimen thickness: ≤ 3 mm (customizable).
• Test area: 33 cm²; specimen size: Φ74 mm.
• Test chamber volume: 45 L.
• Gas supply: Air; supply pressure: 0.6 MPa; port size: Φ6 mm PU tubing.
• Instrument dimensions: 660 × 580 × 580 mm (L×W×H).
• Power supply: 220 VAC 50 Hz / 120 VAC 60 Hz.
• Net weight: 80 kg.