INFICON
Calibration | 11
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11 Calibration
11.1 About Calibration
There are two ways of calibrating the probe:
• Calibration gas: Available at gas suppliers and has a known concentration of
hydrogen (10 ppm hydrogen in synthetic air is recommended).
• Calibration leak: Available at INFICON and has a fixed leak rate (mbar l/s or g/y).
Both methods take less than 2 minutes to perform.
If calibration fails you can still use the instrument. Last valid calibration parameters will
be used. You should, however, check that the instrument reacts to the reference.
11.1.1 When Needed?
It is important to have a correct calibration when measuring the amount of a leak.
Calibration may then be necessary when the instrument is set in these modes:
• Measuring Mode, or
• Combined Mode used to measure leaks.
Set Calibration Interval
Automatic calibration reminder can be set in this way:
1. Click Settings > Calibration > Interval.
2. Set interval.
Spans between 1 second to a maximum of 255 days. Set the interval to "Off" to
turn the automatic calibration reminder off.
The unit will then signal the interval through a pulsating sound indication together with
the text "Calibrate!"
The sensitivity changes slowly with time. Therefore we recommend regularly
calibration to keep the highest measuring accuracy. How often you need to calibrate
depend on measuring situation and leak rate size. Contact INFICON to get help to this
assessment.
11.1.2 Required Equipment
• Calibration Gas or Calibration Leak
• Tracer gas (to feed the leak)
