Inficon T-Guard Leak Detection Sensor Manual do Utilizador descarregar pdf (Página 65)

Operation 63

jina85e 5.fm Technical Handbook(1112)

Main menu → Info →

Cal Factor

This screen shows the actual calibration factor and its global limits. The calibration

factor should be near 1 for a good setting of the automatic times.

Possible values: 0.2 to 5.

Default setting: 1.

Service

This menu item is for authorized INFICON service personnel only.

Main menu → Access control →

Access to CAL function

Here, you can lock and unlock the access to the calibration function.

Change Menu PIN

Here, you can set or change a 4 digit PIN to prevent access to the menu via the

control unit. A Menu PIN of "0000" means, that no Menu PIN is assigned.

5.9 F.A.Q. - Frequently asked questions

Q: Why can the measurements not be reproduced?

A1: It is less possible to reproduce measurements when the T-Guard indicates

"moderate background" or "bad background".

Remedial measures: Decrease the background by checking the helium supply

for leaks. If possible, place the helium supply far away from the T-Guard.

Evacuate the test sample after the measurement in order to dispose of the

helium.

Purge the measurement chamber with ambient air. Carrier gas mode only works

if you have a constant pressure of 5 ppm of helium in the air.

A2: Measurements are less reproducible if the chamber has little slots or holes. A

calibration factor of 1.3 or more indicates that he chamber volume was entered

correctly.

A3: Measurements are less reproducible if the trigger level is a lot higher than the

measured leakage rate. The trigger level should be equal to the leakage rate to

be measured.

A4: Measurements are less reproducible if the measurement time was reduced too

much. This has the same effect as a trigger level that is too high.

A5: Measurements are less reproducible if the chamber fan is too weak. The fan

should circulate the chamber volume twice per second.

A6: Measurements are less reproducible if they are carried out in Only GROSS

mode. If this is the case, the T-Guard displays "Only GROSS" when changing the

trigger level.

Remedial measures: Avoid an Only GROSS measurement by using diluted

helium (and setting this) or by using a larger chamber.

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Inficon T-Guard Leak Detection Sensor Manual do Utilizador Página 65