INFICON Sensistor Sentrac Hydrogen Leak Detector - Manual (Page 49)

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10 Calibration
10.1 About Calibration
There are two ways of calibrating the probe:
• Calibration gas: Available at gas suppliers and has a known concentration of
hydrogen (recommend 10 ppm hydrogen in synthetic air).
• 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.
10.1.1 When Needed?
It is important to have a correct calibration when measuring the amount of a leak.
Calibration may then be necessary when detector is set in these modes:
• Locating Mode
• 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.
To turn automatic calibration reminder off.
The unit will then signal the interval through a pulsating sound indication together with
the text "Calibrate!"
10.1.2 Required Equipment
• Calibration Gas or Calibration Leak
• Tracer gas (to feed the leak)
• Relevant Certificate
For more information see Chapter 17 “Spare Parts and Accessories” on p. 73.
Notice 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.
Notice The sensitivity change slowly during the 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.