Site: Home > Home > Products > Property > Water&Vapor permeability

water vapor transmission analyzer

Description:Qinsun provides water vapor transmission analyzer for testing water vapor & moisture transmission rate of films and packages for many applications.

Factory Direct SalesQuality AssuranceLightning DeliveryHassle-free Service
Free Quote
water vapor transmission analyzer

Product Details

The water vapor transmission analyzer can measure the water vapor transmission rate of various materials under different kinds of  restricted conditions. The test conditions can simulate the actual application environment. The test results are featured with accuracy and reproducibility.
Operating Principle

 Two independent gas streams are maintained on the two sides of a sample at the desired temperature. Humidity and gas flow rates are measured. The transmission rate through the sample is computed using mass balance.
 Operating Principle

n = moles Φ = humidity M = flow rate
t = time p = equilibrium vapor pressure
ί = inlet o = outlet P = total pressure


The PMI Water Vapor Transmission Analyzer is capable of measuring water vapor transmission through porous media such as textiles, leathers, man made materials, membranes, nonwovens, and fabrics used in numerous high technology components and consumer products manufactured by a variety of industries.

The instrument has the unique ability to measure vapor transmission rate over a wide range of humidity, temperature, and pressure under gradients of humidity, temperature, and pressure encountered in application environments.

· Humidity on any side can be maintained between 5 and 95%
· Any desired pressure gradient can be maintained.
· Any desired test temperature can be achieved.
· Simultaneous pressure and humidity gradients can be maintained
· Flat samples in a wide range of sizes can be accommodated
· Completely automated test implementation, data acquisition, data store and data simplification.
 Technical Parameters



Humidity (φ) measurement

Range: 5 - 95%
Accuracy: ± 2%

Differential pressure transducers

Range: 4 torr (2 mm Hg)
Accuracy: 0.015%

Mass Flow Transducers

Range: 5 L/min
Accuracy: 1%

Humidity (φ) control

Range: 0 - 100%
Accuracy: ± 1.5% (φ = 0.5) ± 5% (high & low φ)


Range: RT - 100 °C
Control: ± 2%
Accuracy: 0.4 °C (low φ) - 0.8 °C (high φ) at 100 °C

Mass Flow Controller

Range: 2000 cc/min
Accuracy: 1%


Related Products

Leave Message

Send message or email get favorable prices,reply tu you within 24 hours!

Copyright 2022:Qinsun Instruments Co., Limited

High-end textile tester supplier | Textile Testing Equipment pdf | Tel:021-67800179 |