SYSTEST Jinan SikeThe infrared detection sensor method water vapor transmission tester is an instrument developed and produced by Jinan Sike Testing Technology Co., Ltd. for measuring the water vapor transmission rate of materials. The main instruments include WVTR-220 and WVTR-226, which use infrared sensors to detect water vapor concentration and accurately measure the water vapor transmission rate of materials. It is used to evaluate the moisture barrier performance of materials.

Taking the WVTR-226 water vapor permeability tester as an example for introduction:

Test principle: Infrared detection sensor

This method is based on the logic of "humidity difference driven diffusion+infrared precision detection", and the specific process is as follows:

1. Seal the sample between the dry chamber (low humidity) and the wet chamber (high humidity) of the instrument, and maintain a constant temperature environment in both chambers.

2. Water vapor diffuses from the wet chamber to the dry chamber through the sample due to the humidity difference on both sides.

3. The carrier gas inside the dry chamber (such as dry nitrogen) will carry diffused water vapor and transport it to the infrared sensor.

4. Infrared sensors output electrical signals proportional to the concentration of water vapor based on its absorption characteristics of specific wavelengths of infrared light.

5. By analyzing the variation pattern of electrical signals, the water vapor transmission rate (WVTR) and moisture permeability coefficient of the material are calculated.

Main Features

• Easy to operate: computer-controlled, fully automatic testing, one click operation, and multiple testing modes such as intelligent mode to choose from, which can meet various standard and non-standard tests.

• Powerful data management: data audit tracking, traceability, system log recording, 5-level user permission management, supporting temperature, flow, humidity, transmittance and other curve displays, can achieve unified data management.

• Accurate temperature and humidity control: It has a wide range and high-precision temperature and humidity control capability, with a temperature control range of 5 ℃ -95 ℃ and a temperature control accuracy of ± 0.1 ℃. The humidity in the humidity chamber can be set between 0% RH, 35% RH-90% RH, and 100% RH, with a humidity control accuracy of ± 1% RH.

• Complete safety protection: It has multiple protection functions such as overvoltage, overcurrent, overtemperature, and automatic overload protection.

Sensitivity of WVTR-226 Water Vapor Transmittance Tester to Water VaporhighIt can capture trace changes in water vapor and is suitable for testing low moisture permeable materials such as barrier films. Compared to traditional weighing methods, there is no need to wait for moisture accumulation for a long time, which can shorten the testing period and improve testing efficiency. Adopting constant temperature and humidity control, combined with stable transportation of carrier gas, reducing external environmental interference, and strong repeatability of test data. Suitable for testing the water vapor transmission rate of various plastic films, composite films, paper plastic composite films and other film like materials, as well as packaging containers such as bottles, boxes, bags, etc. It can be applied in packaging fields such as food, medicine, daily chemical, and industry.