Gas Transmission Rate Measurement System GTms-1 Series

Measure the absolute amount of gas transmission rate with a high sensitivity
With Standard Conductance Unit developed by AIST(National Institute of Advanced Industrial Science and Technology), this system can measure the absolute amount of transmission rate with a high sensitivity.

Applications

Gas transmission rate measurement of gas barrier films widely used as packaging for food, drink and medical products or sealing of electronic device

Features

By the use of Standard Conductance Unit, an absolutely-corrected measurement data is available.
By the use of a mass spectrometer, other gases like O2 or N2 as well as water vapor are available

Specifications

Temperature range	40 °C (standard)　*up to the heat-resistance temperature of a sample
Minimum measurement sensitivity	Water vapour: 10^-6 g/m²/day or less Oxygen: 10^-2 cc/m²/day or less
Measurable gas	Water vapour, Oxygen, Nitrogen etc.
Detecting method	Quadrupole mass spectrometer

Model

Model	GTms-11CM	GTms-11CA	GTms-12CM	GTms-12CA
Number of samples (Number of chambers)	1	1	2	2
Data analysis	Manual	Automatic	Manual	Automatic

Measurement Principle

Preparation of calibration curve: With no sample placed, flow vapor (or gas) by using Standard Conductance Unit under some amount of vapor (or gas) pressure and measure ion current with a mass spectrometer. Repeat this process several times under the different amounts of vapor (or gas) pressure to make calibration curve.
Sample setting: Set a sample and exhaust a sample chamber with a turbo molecular pump into a high vacuum condition.
Gas introduction and measurement: After reaching the high vacuum condition, introduce vapor (or gas) from the upper side of the sample chamber and start measuring. With the mass spectrometer, measure the ion current of the vapor (or gas) that has transmitted through the sample.
Transmission rate analysis: With the calibration curve, calculate the transmission rate from the ion current of the vapor (or gas) that has transmitted.