OX-TRAN 2/61 OTR Analyser

The OX-TRAN 2/61 instrument allows you to test up to 6 film samples or packages with the optional adaptor. 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.

High Accuracy

  • Patented Coulox® sensor is the only absolute Coulometric sensor on the market, never requiring calibration
  • For common barriers with detection levels down to 0.5 cc/(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

The OX-TRAN 2/61 uses the MOCON’s patented Coulox absolute coulometric sensor requiring no calibration which is the basis for the ASTM standard D3985.

From simple barrier films to complex packages, the Ox-Tran 2/61 is one of the most trusted instruments found in permeation laboratories around the world for testing both films and packages. It is the only instrument with 6 cell capability providing high throughput in the popular permeation range from 0.5 to 200 cc/(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 OX-TRAN series of instruments have been the most trusted and longest-lasting on the market. The 2/61 offers cost-effective, versatile OTR 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
Coulox® Sensor
  • Short exam times reduces overall test time to increase throughput
  • No sensor calibration
  • Longer sensor life than others on the market
  • More accurate and repeatable results vs. sensors that require calibration
  • Intrinsic sensor fully complies with ASTM D3985
 OX-TRAN 2/61
Test Ranges (Single Cell)cc/(m2 × day)0.5 to 1000
cc/(100 in2 × day)0.03 to 65
cc/(pkg × day)0.0025 to 5
Test Ranges (Six cells combined)cc/(m2 × day)0.1 to 167
cc/(100 in2 × day)0.0065 to 10.8
cc/(pkg × day)0.0005 to 10
Resolutioncc/(m2 × day)0.1
Repeatability (single cell)cc/(m2 × day)± 0.5 cc/(m2-day) or ± 1% of value*
Repeatability (six cell)cc/(m2 × day)± 0.1 cc/(m2-day) or ± 1% of value
OX-TRAN 2/61Units
Test Temperature Range20° C to 65° C ± 0.5 ° C
Controlled RH Testing Range35% to 90% RH & 100% 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
Carrier GasNitrogen
Other Specifications:

Physical Specifications

  • 12” H x 12” W x 27” D (30.4 cm x 30.4 cm x 68.6 cm)
  • 52 Lbs. (23.6 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 95% RH (non-condensing)
Gas Supply Requirements
Carrier GasGas CompositionNitrogen/Hydrogen Mix (98%/2%)
Supply Pressure, Nominal25 PSI, (1.72 Bar), (172 kPa)
Test GasGas Composition100% Oxygen (purity 99.9%)
Supply Pressure, Nominal25 PSI, (1.72 Bar), (172 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
  • 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

ASTM D3985
ASTM F2622
ASTM F1307
ASTM F1927
ISO CD 15105-2
IS K-7126-2
DIN 53380-3

Test Methodology

Following ASTM D3985

Standard Test Method for Oxygen Gas Transmission Rate Through Plastic Film and Sheeting Using a Coulometric Sensor

The test specimen is mounted as a semi-barrier between two chambers at ambient atmospheric pressure. One chamber is slowly purged by a stream of nitrogen and the other chamber contains Oxygen. As Oxygen permeates through the film into the nitrogen carrier gas, it is transported to the coulometric detector where it produces an electrical current, the magnitude of which is proportional to the amount of oxygen flowing into the detector per unit of time.