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PERME^TM  W3/0120 Water Vapor Transmission Rate Test System is for the water vapor transmission property determination of packaging materials as plastic films and laminated films, as well as various materials applied in the medical field. Through water vapor transmission rate measurement, the technical index control and adjustment as well as product applications are satisfied.
Characteristics
Computer control; automatic testing process.
12 independent chambers;
Interval weighing measurement, auto-zero before each weighing;
Cylinder cam type lifter lift and lower the cups;
Standard wind velocity;
Heating and refrigeration; automatic temperature control;
Automatic humidity control;
Temperature and humidity testing port;
Specific function compliance;
Two rapid calibration modes of standard weight and reference films;
RS232 interface;
Network transmission interface for LAN data management and Internet data transmission.
Principle
A specific humidity difference is formed among the two sides of the specimen under a certain temperature. The water vapor permeates through the specimen and into the dry side. By measuring the weight changes of the cup, water vapor transmission rate and water vapor transmission coefficient can be obtained.
Performance
Max. 12 kinds of materials can be measured at the same time. Varied testing modes are
selectable according to actual situation.
Through computer processing, data can be statistically grouped and stored. When inquire for the historical data, the historical record and data dynamic analysis drawing can be obtained so as to realize thorough analysis of manufacturing processes.
Technical Indexes
Test Range: 0.1～10,000g/m²·24h
Numbers of Specimen: 1-12 pieces
Test Accuracy: 0.01g/m²·24h
Resolution: 0.0001g
Test Temperature: 15℃～65℃
Temperature Accuracy : ±0.1℃
Test Humidity: 40% RH～95% RH (Standard 90% RH)
Humidity Accuracy : ±1%RH
Purge Velocity: 0.5～2.5 m/s(non-standard, optional)
Test Area: 33 cm²
Specimen Thickness: ≤3mm
Specimen Size: φ74 mm
Testing Chamber Volume: 80L
Gas Source: air
Gas Source Pressure: 0.6MPa
Power: AC 220V 50Hz
Dimensions: 826 mm (L)×726 mm (B)×702mm (H)
Mainframe Net Weight: 114kg
Standards:
ASTM E96, ASTM D1653, TAPPI T464, ISO 2528, DIN 53122-1, JIS Z0208, YBB 00092003, GB1037, GB/T 16928
Configuration 
Standard: Mainframe, software, cup, gas dry device, auto dry filter, calibration weight,communication cable, sample cutter.
Optional: reference film, air compressor, desiccant.
Note: Users provide distilled water for themselves.