INFICON T-Guard Leak Detection Sensor - Manual (Page 43)

Operation
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5.2 Calibrating
Before you measure, you should set-up the unit according to your measuring
arrangement and calibrate it. This ensures that the unit will really be able to measure
what you want to.
5.2.1 Preparing Calibration
Before calibrating the T-Guard™, you should follow these steps in the described
order:
For the Carrier Gas mode:
1 Input the carrier gas flow (e.g from the mass flow controller, 30,000 sccm in
Settings
→
Measurement Settings
→
Carrier Gas Flow)
2 Change Trigger 1
3 Change the measuring time, when required (a shorter measuring time causes a
lower repeatability).
4 Enter the Calibration Leak Rate (must be higher than half of the trigger level)
5 Place the calibrated leak inside the chamber.
6 Close the chamber
7 Wait for a certain time which is calculated by:
8 Start the calibration (refer to Chapter 5.2.2 )
For the Accumulation mode:
1 Enter the net volume (chamber volume minus sample volume)
2 Set Trigger 1
3 Change the measuring time, when required (a shorter measuring time causes a
lower repeatability).
4 Enter the Calibration Leak Rate (must be higher than half the trigger level)
5 Place the calibrated leak inside the chamber.
6 Close the chamber
7 Start the calibration (refer to Chapter 5.2.2 )
Notice You can also view and edit all settings on one page in:
Main menu
→
Info
→
View/Edit settings
Most important settings are on top, least important settings are on
the bottom of this table.
3 x chamber volume (in ccm)
Carrier gas flow (in ccm per seconds)
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