PERMATRAN-W 3/61 WVTR Analyser

The PERMATRAN-W 3/61 instrument allows you to test up to 6 film samples or packages at a time. The single head design is easy to load with one clamp while the user software provides a convenient dashboard showing cell status or individual cell test progress.

Highest Accuracy

  • MOCON’s Patented Modulated InfraRed sensor is the only modulated sensor system on market meeting ASTM F1249
  • For common barriers with detection levels down to 0.05 g/(m2*day)
  • Fully adjustable temperature, flow and RH controls for a wide range of testing

High Throughput and Flexibility

  • Fast sensor response time allows short test times
  • Parallel testing of 6 samples at a time
  • Option to test either films or packages with the optional adaptor

The PERMATRAN-W 3/61 can test the Water Vapor Transmission Rate (WVTR) on both films and packages from low to high barriers. It uses the MOCON’s patented long-life modulated IR sensor which is the basis for the ASTM standard F1249. This analyser provides very accurate and repeatable test results within a wide detection range from 0.05 to 500 g/(m2*day).

The instrument has interchangeable heads allowing testing of films, packages, or connection to remote testing cells. The easy to use operator interface can be connected to other MOCON instruments providing centralized control and monitoring of multiple instruments. It’s fully adjustable temperature, flow and RH range allows a wide range of testing.

For more than 25 years, MOCON’s PERMATRAN series of instruments have been the most trusted and longest-lasting on the market. The 3/61 offers cost-effective, versatile WVTR analysis.

High Throughput
  • Integrated 6-cell test head for parallel testing of 6 samples or two triplicate tests at the same time
  • Compact test chamber area is easy to load
  • Consistent test conditions across all 6 cells
  • Single clamp provides repeatable results
  • Optional head adaptors allow package testing or connection to remote test cells
Simple user interface
  • Overview dashboard screen provides the status of all cells at a glance
  • Automatically generated test reports contain complete test data and conditions for all 6 cells
  • One control system can be connected to other MOCON instruments providing centralized monitoring and control for multiple instruments
Modulated IR Sensor
  • Short exam times reduce overall test time to increase throughput
  • Longer sensor life than others on the market
  • Accurate and repeatable results
  • Most trusted modulated IR sensor that fully complies with ASTM F1249
Test Ranges (Single Cell)g/(m2 x day)0.05 to 500
g/(100 in2 x day)0.003 to 32
g/(pkg x day)0.00025 to 5
Test Ranges (Six cells combined)g/(m2 x day)0.01 to 85
cc/(100 in2 x day)0.0065 to 5.5
cc/(pkg x day)0.0005 to 0.423
Resolutiong/(m2 x day)0.0003
Repeatability (single cell)g/(m2 x day)± 0.5 cc/(m2-day) or ± 1% of value*
Repeatability (six cell)g/(m2 x day)± 0.1 cc/(m2-day) or ± 1% of value

*whichever is greater

PERMATRAN-W 3/61 OTR AnalyserUnits
Temperature Control Range20 °C to 65 °C ± 0.5 °C
Humidity Control, Film Cell, Test Gas100% and 35% to 90% RH ± 3 RH
RH Film Cell-to-Cell Uniformity± 3 RH
Film Size1.5″ x 1.5″ (3.81 x 3.81 cm), each cell
Film ThicknessUp to 100 Mil
Film Test Area6 cells @ 10 cm2 each

Physical Specifications

  • 12″ x 12″ x 26″ (30.4 cm x 30.4 cm x 66.0 cm)
  • 63Lbs. (28.6 kg)

Electrical Requirements

  • Voltage: 100 – 240 VAC 50/60 Hz
  • Maximum Power Draw: 500 VA
Laboratory Requirements
TemperatureOperation22 °C ± 2 °C
Storage10 °C to 30 °C
HumidityOperation20% to 80% RH (non-condensing)
Storage5% to 85% RH (non-condensing)
Gas Supply Requirements
Carrier GasGas CompositionNitrogen (99.7% N2 or better)
Supply Pressure, Nominal29 PSI, (2.0 Bar), (200 kPa)
  • Dual RS-485 ports (One for input from other instrument and one for output to a computer)
Compliance Standards
  • Conforms to CE Product Safety, Electromagnetic Emission & Susceptibility requirement
Cartridges & Options
  • Package Testing Adaptor Head Rack 6 Package testing station
  • Cert Films 1-2, & set
  • Data collection software – PermNet

Packaging Films

  • Monolayer
  • Multi-layer
  • Coated Films
  • Coated Paper/paperboard


  • Common food packages
  • Medical packages
  • Bottles/Closures
Test Standard Compliance

ISO 15106-2

Test Methodology

Following ASTM F1249;

Standard Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor

Summary of Test Method
1. A dry chamber is separated from a wet chamber of known temperature and humidity by the barrier material to be tested. The dry chamber and the wet chamber make up a diffusion cell in which the test film is sealed. Water vapor diffusing through the film mixes with the gas in the dry chamber and is carried to a pressure-modulated infrared sensor. This sensor measures the fraction of infrared energy absorbed by the water vapor and produces an electrical signal, the amplitude of which is proportional to water vapor concentration. The amplitude of the electrical signal produced by the test film is then compared to the signal produced by the measurement of a calibration film of known water vapor transmission rate. This information is then used to calculate the rate at which moisture is transmitted through the material being tested.