DRK311 water vapor transmission rate tester-electrolysis method (three chambers) 1.1 Equipment use It is suitable for the determination of water vapor transmission rate of plastic film, composite film and other films and sheet materials. Through the determination of the water vapor transmission rate, the technical indicators of the control and adjustment of packaging materials and other products can be achieved to meet the different needs of product applications. 1.2 Equipment characteristics R three chambers can simultaneously measure the water vapor transmission rate of the sample R The three tests are completely independent, and can test three same or different samples at the same time R wide range, high-precision temperature and humidity control, to meet the test under various test conditions The R system adopts computer control, and the whole test process is completed automatically R standard mode, proportional mode, continuous mode and other test process judgment modes R is equipped with a USB universal data interface to facilitate data transfer 1.3 Test principle Clamp the pre-treated sample between the test chambers. Nitrogen with a certain relative humidity flows on one side of the film, and dry nitrogen flows on the other side of the film. Due to the humidity gradient, water vapor will pass through the high humidity side. Diffusion through the film to the low humidity side. On the low humidity side, the permeated water vapor is carried by the flowing dry nitrogen to the sensor. When entering the sensor, an electrical signal of the same proportion is generated. The electrical signal of the sensor is analyzed and calculated to obtain the sample's value. Parameters such as water vapor transmission rate. 1.4 System indicators  test range: 0.001～40 g/(m2·24h)  resolution: 0.001 g/㎡·24h  number of samples: 3 pieces (independently)  sample size: 105mmx120mm  test area: 50c㎡  sample thickness: ≤3mm  temperature control range: 15℃～55℃  temperature control accuracy: ±0.1℃  humidity control range: 50%RH～90%RH;  humidity control accuracy: ±2%RH  carrier gas flow: 100 ml／min  carrier gas type: 99.999% high purity nitrogen  test condition: environment (standard condition 23℃)  Dimensions: 380mm (L) x680mm (B) x280 mm  power source: AC 220V 50Hz  Net weight: 72kg