GTTGas transmission tester

Our new GTT is a gas permeability tester that combines cutting-edge technology with the proven robust measuring principle of its predecessor, the GDP-C. This makes the GTT an exceptionally compact device with a high-resolution touchscreen for inputting all the data needed for measurements and outputting analysis results. A wireless keyboard (and wireless mouse) can also be used to enter data if required. Even more con-nectivity options are provided in the form of two readily available USB connections on the front of the device and a LAN port at the back. There is no need for an additional PC to control the GTT or evaluate its data. This new model has replaced the extremely energy-hungry external water bath thermostat with an energy-ef-ficient electrothermal temperature control device. This means that the GTT is easy to install without extra apparatus (except a vacuum pump) and is ready to use as soon as it has been set up.

The GTT also boasts the following features• The device has been designed without any wear parts, making it exceptionally low-maintenance. • It comes with a highly robust sensor (piezoresistive pressure sensor) and can withstand the sudden ingress

of air during a measurement without being damaged in any way. It is also immune from the oversaturation that can affect electrochemical sensors.

• The combination of an extremely low measurement volume (typically 0.3 cm3) and sophisticated analysis software enables highly sensitive measurements of gas transmission.

• The measurement principle used means that the requirements for generating a vacuum are relatively low. As the starting pressure level has no impact within a broad range (up to 10 hPa), all that is needed is a simple rotary vane pump.

• Its ability to directly measure the gas transmis-sion of a wide range of different test gases significantly increases the number of poten-tial uses for this device. For instance, the properties of the materials being tested can often be measured much faster and more precisely. The device does not require any modifications, let alone any intervention, to be used for different test gases.

• The device comes with a gas-saving mode in which the flow rate of the test gas can be reduced to approximately 1.2 l per hour – in other words, for example, that the contents of a small 10 l bot-tle can give 60 days of uninterrupted measurement.

• Several measurement modes enable values including the time lag to be calculated. This is needed in order to determine further physical properties such as the solubility or the diffusion coefficient of the sample.

• The temperature is controlled electrothermally by ultra-precise, energy-efficient Peltier elements during the sampling process, covering the full temperature range of 15°C to 45°C that is conventionally used for measurements. This gives the user numerous options for measuring other material properties, such as the activation energy.

• Potential uses for the GTT even include humidified test gases thanks to a digital sensor located right inside the top sample chamber that relays continuous measurements of the relative humidity and temperature of the test gas.

The information contained in this document is subject to change without notice.

Specification

Sample chart and test report

Test method Quantitative determination of the Gas Transmission Rate of film materials using differential pressure me- thods (manometric methods) according to ISO 15105-1Test gas All non-corrosive, inert gasesGas flow of the test gas 50 cm3/min approx. \ 20 cm3/min using test gas save modeMeasuring Range 0.05 cm3/(m2×d×bar) to 20.000 cm3/(m2×d×bar) [up to 106 cm3/(m2×d×bar) with masking]Resolution 0.01 cm3/(m2×d×bar) Leak rate of the test system better 0.03 cm3/(d×bar)Zero pressure 0 Pa (depending on the vacuum pump used)Pressure sensor permeat piezoresistive element pressure Tolerance better 0.3% FS Resolution (internal) 21 bit resp. 0,05 Pa Pressure sensor test gas 0 hPa to 1200 hPaTolerance better 1% FS Resolution (display) 0.1 hPaHumidity sensor test gas 10% R.H. to 90% R.H.Tolerance better 3%Temperature sensor test gas 0°C to 80°CTolerance better 3%Sample temperature range 15°C to 45°C Tolerance better 1 °CTemperature constancy better 0.2 °CControl in-build, 10” touch panel PC, high industrial standard Dimensions approximately 45 x 50 x 30 cmWeight approximately 23 kgStorage temperature 0°C to 50°CWorking temperature 20°C - 26°C (to be constant during testing) Relative humidity max. 80%, non-condensingElectrical connection GTT 100-115 VAC / 220-240 VAC, 50-60 Hz, power consumption approx. 150 W

3/13/2017

Sample informations:

Test conditions:

Test informations:

Sample name: PET23

Sample typ: PET

Thickness [µm]: 23

Sample number: 1b

Order number: 260

Received: -

Requested: xxx

Tested by: Lallinger

-

Mask: False

Area [cm²]: 78.4

Test method: A

Flush time [s]: 0

Device number: 260

Device constant: 398000

Test start: 2017-02-14 12:52:37

Test period: 01:30:51

Evacuation time: 00:45:00

3/13/2017

Sample informations:

Test conditions:

Test informations:

Sample name: PET23

Sample typ: PET

Thickness [µm]: 23

Sample number: 1b

Order number: 260

Received: -

Requested: xxx

Tested by: Lallinger

--

Pre-conditioning [h]: -

Mask: False

Area [cm²]: 78.4

Test method: A

Flush time [s]: 0

Device number: 260

Device constant: 398000

Test start: 2017-02-14 12:52:37

Test period: 01:30:51

Evacuation time: 00:45:00

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h:mm

3/13/2017

Sample informations:Results for O2:

Test conditions:

Test informations:

Sample name: PET23

Sample typ: PET

Thickness [µm]: 23

Sample number: 1b

Order number: 260

Received: -

Requested: xxx

Tested by: Lallinger

GTR [cm³/(m²dbar)]: 61.2

P [100µm*cm³/(m²dbar)]: 14.1

Solubility [cm³/cm³bar)]: 3.6e-02

Diff. coefficient [cm²/s]: 4.6e-09

Time lag [s]:192

example

Test gas:O2

Humidity [% RH]:25

Sample temperatur [°C]: 23

Layer:Bottom

Pre-conditioning [% RH]: -

Pre-conditioning [°C]: -

Pre-conditioning [h]: -

Room Conditions [% RH]: 50

Room Conditions [°C]: 25

Mask: False

Area [cm²]: 78.4

Test method: A

Flush time [s]: 0

Device number: 260

Device constant: 398000

Test start: 2017-02-14 12:52:37

Test period: 01:30:51

Evacuation time: 00:45:00