Highly Accurate Water Vapour Permeation Analyser Using Infrared Sensor ASTM F1249 - W401 - Hylec Controls

Highly Accurate Water Vapour Permeation Analyser Using Infrared Sensor ASTM F1249 - W401

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The W401L high-end precision water vapour transmission rate tester, employing the infrared method, is an advanced packaging material testing instrument. It adheres to ASTM, GB standards, and market demands, specifically designed for testing the water vapour transmission rate under predefined temperature and humidity conditions. This instrument is ideal for evaluating the water vapour transmission rate performance of films, sheets, papers, packages and various materials in industries such as food, medicine, medical equipment, daily chemistry, and photovoltaic electronics.

Test Principle The W401L tester operates on the infrared method, featuring a test chamber where a pre-treated sample is fixed in the middle. The chamber is divided into high-humidity and low-humidity sides. Humidified nitrogen flows on one side of the film, while dry nitrogen (carrier gas) flows on the other side at a fixed rate. In the presence of a humidity gradient, water vapor permeates from the high-humidity side to the low-humidity side. The infrared sensor captures the water vapor carried by the flowing dry nitrogen, providing the water vapor transmission rate and other parameters through the sensor's electrical signal output.

Standard ASTM F 1249, BS EN ISO 15106-2, JIS K7129, GB/T 26253, YBB 00092003


  • Test Range: 0.01~200 g/(m2·24h)
  • Resolution: 0.0001 g/(m2·24h)
  • Temperature Control Range: 15~45℃
  • Temperature Control Accuracy: ±0.2℃
  • Humidity Control Range: (5~90) %RH, 100%RH
  • Humidity Control Accuracy: ±2%RH
  • Permeable Area: 50.24 cm2
  • Sample Size: Φ100 mm
  • Sample Thickness: ≤3 mm
  • Sample Quantity: 1 piece
  • Carrier Gas: 99.999% Nitrogen (user-provided)
  • Carrier Gas Pressure: ≥0.1 MPa
  • Carrier Gas Flow: 5~100 mL/min
  • Dimension: 380545315mm
  • Power: 450 W
  • Power Supply: AC 220 V, 50 Hz


  • High-precision patented infrared moisture sensor for accurate testing.
  • Accurate and reliable test data with precise control of temperature and humidity.
  • Ultra-wide test range for high instrument applicability.
  • Intelligent operating system with global certification.
  • Professional calibration service for accurate and reliable data.


  • Film: Water vapor transmittance test of various plastic films.
  • Sheet: Water vapor transmittance test of solid pharmaceutical hard sheets.
  • Paper, Cardboard, and its Composites: Water vapor transmittance test of coated paper, silicone paper, cigarette bag aluminized paper, etc.
  • Medicinal Patches: Water vapor transmission performance test of medical plasters.
  • Package: Customisable fixtures for packages like pharmaceutical polyethylene bottles, sealed bags, pharmaceutical ointment tubes, etc.

Factory Configuration

  • Standard Configuration: Power cord, communication line, sample cutter, sealing grease, ferrule joint, reference material, hexagonal wrench, syringe, sealing ring, syringe sealing ring, fork wrench, Phillips screwdriver, mouse, metal gas tube.
  • Optional: Computer, Metrology certificate, Air compressor.
  • Remark: Standard laboratory environment, power requirements, computer requirements, and other accessories specified.


Technical Parameters

Test range

0.01~200 g/(m2·24h)


0.0001 g/(m2·24h)

Temperature control range


Temperature control accuracy


Humidity control range

(5~90) %RH, 100%RH

Humidity control accuracy


Permeable area

50.24 cm2

Sample size

Φ100 mm

Sample thickness

≤3 mm

Sample quantity

1 piece

Carrier gas

99.999% Nitrogen (user-provided)

Carrier gas pressure

≥0.1 MPa

Carrier gas flow

5~100 mL/min




450 W

Power supply

AC 220 V, 50 Hz