INFICON T-Guard Leak Detection Sensor - Manual (Page 32)

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Installation
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The T-Guard™ Leak Detection Sensor can be used in each orientation. You can
unscrew the rubber feet and use these holes to fasten the main unit.
Please only remove the plugs when you connect the hoses to the T-Guard™. At the
time of delivery, the T-Guard is filled with helium-free nitrogen. This avoids helium to
penetrate into the sensor.
The T-Guard™ Leak Detection Sensor must be installed near the test chamber,
since the standard measuring line is only 50 cm long (measuring line 2m length see
3.5.6 ).
Notice Changing the length or inner diameter of the test line affects the
measurement speed and results.
Notice Apply grease to the outside of the ends of the green measurement lines in
a thin film to be able to slide them into the connections until they snap in.
Otherwise it can happen that they are not deep enough in the connector
and measuring errors can appear.
4.3 Choosing a Fore Pump
You can use any vacuum pump with a gas flow of more than 200 sccm at a base
pressure of less than 50 mbar.
Connect the vacuum pump with a 6 mm tube to the tube connector labelled with
"
OUT " .
Caution
The T-Guard™ Leak Detection Sensor stops working when oil penetrates into it
from one of the fore pumps.
Arrange the pumps with oil seal below the T-Guard™ Leak Detection Sensor.