Inficon T-Guard Leak Detection Sensor Manual de usuario descargar pdf (Pagina 48)

46 Operation

jina85e 5.fm Technical Handbook(1112)

INFICON recommends this kind of set-up for Accumulation mode:

5.3.2 Carrier Gas Mode

In addition to the gas flow, which the T-Guard™ Leak Detection Sensor takes out of

a chamber, more air can be sucked through the chamber using a fan or a pump.

This additional gas flow quickly carries the helium from the leak to T-Guard™ Leak

Detection Sensor. This way of leak detection is called Carrier Gas mode.

In Carrier Gas mode, the T-Guard™ Leak Detection Sensor measures the helium

content in the gas stream for a certain time. The helium signal from the end of the

measurement will be used in order to calculate the leak rate.

Carrier Gas mode can be used to detect bigger leaks faster than in Accumulation

mode.

The Carrier Gas mode is very sensitive to fluctuations of the helium background. An

elevated helium background is usually not stable.

Fig. 6-9 Recommended settings for Accumulation mode

Item Description Item Description

1 Test sample 5 T-Guard™ Leak Detection Sensor

2 Testing chamber

6 Fore pump exhaust air far apart from the

chamber

3Fan

4 Measuring line connected

to the chamber

7 Reference line

8 Buffer volume > 4 litres

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Inficon T-Guard Leak Detection Sensor Manual de usuario Pagina 48