Moisture transmission tester

Operating principle: when using the instrument of sensor technology to test the transmittance of water vapor, the sample will be clamped or pasted to a test chamber, and the test chamber will be divided into upper and lower parts. At this time, ammonia with certain humidity will enter the upper half of the test chamber, and dry ammonia will flow through the lower half. Water vapor molecules enter the lower half of the test chamber through the sample and are carried to the sensor by the carrier gas.

features

All instruments are traceable to NIST.

The instrument can be calibrated with standard gas or standard membrane, which is convenient and fast.

Absolute moisture test, no calibration required.

Electronic control of gas flow, temperature and relative humidity, extremely high repetition accuracy and responsiveness.

Friendly windows operating software.

No coolant, catalyst or special gas mixture is required.

measuring range

0.002-70g/m2/day (without mask) 0.02-1000g/m2/day (face).

The original imported instrument ensures the test accuracy, repeatability and sensitivity of the instrument.

Up to 5 instruments can be used together to measure more samples at the same time.

Precise control

All analytical instruments provide accurate electronic control of temperature, relative humidity and gas flow, with extremely high repetition accuracy and response capability.

The gas flow of test gas and carrier gas is controlled by high-precision electronic mass flowmeter.

Accurately provide 0%-90% relative humidity.

The widest temperature regulation range on the market, 5-50 ° C.

Barrier and permeability of materials

Dissolution diffusion mechanism

• dissolution diffusion mechanism of permeation: the gas is adsorbed on the film surface at the high concentration side, diffuses in the polymer film, and finally desorbs and volatilizes at the low concentration film side.

• the permeability of the material can be used to describe the flow rate of gas molecules from the high concentration side to the low concentration side of the object.

• specific process of infiltration:

Gas molecules are adsorbed on the film surface at the high concentration side, diffused in the polymer film, and finally desorbed and volatilized at the low concentration side.

• final permeation balance:

The gas molecules reach the equilibrium of dissolution and diffusion in the film, and the permeation rate reaches a stable state.