7. Then run the sniffer probe slowly over the areas of the part to be tested that may leak: the leak
rate displayed varies when a leak is detected (quantitative value of the measured leak rate).
8. Stop the test by pressing the START/STOP button.
7.5 Calibration
Calibration is used to ensure that the leak detector is correctly adjusted to detect the tracer gas selected
and display the correct leak rate.
A calibrated leak is used to calibrate the leak detector.
By default, internal leak is selected to allow for a rapid calibration of the leak detector. It is also possible
to calibrate the leak detector using an external leak.
The leak detector should be calibrated with a calibrated leak of the same type as the tracer gas used.
Detector calibration
20 minutes after switching it on, the detector suggests that the user perform a calibration.
For correct use of the detector and to optimize the accuracy of the measurement, this cali-
bration must be performed.
It is recommended to perform a calibration:
●
at least once a day,
●
for intense operation: start calibration at the beginning of each work session (e.g. work
in shifts, every 8 hours),
●
if it is uncertain whether the detector is working properly.
Internal calibrated leak
The internal calibrated leak is specifically designed for the leak detector. It is composed of:
●
a reservoir filled with
4
He tracer gas (no internal calibration with other tracer gases),
●
a temperature sensor (to take into account the effect of temperature on the leak rate),
●
an integrated diaphragm (to calibrate the leak rate),
●
an identification label (identical to the identification label of an external calibrated leak).
The calibrated leak is supplied with a calibration certificate.
Use a calibrated leak in the range of ≈ 10
-7
mbar · l/s (≈ 10
-8
Pa · m
3
/s).
In the case of intensive use of the detector, a spare internal calibrated leak is recommend-
ed. By default, the detector can be calibrated with an external calibrated leak.
External calibrated leak
The operator must use a calibrated leak containing the tracer gas selected (
4
He, Mass 3 or H
2
).
There are several types of external calibrated leaks, with or without reservoir, with or without valve, cov-
ering several ranges of leaks.
The manufacturer does not provide calibrated leaks in Mass 3 and H
2
.
The choice of external calibrated leak depends on application requirements: use a calibrat-
ed leak from the same leak rate range as the leak to be measured.
7.5.1 Calibration type
The user assigns a calibration type to the CAL button.
Operation
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