Pfeiffer Vacuum ASM 310 - Calibration in hard vacuum test mode with external calibrated leak

●
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.
Calibration
Calibration can be performed when the detector is in ‘Stand-by’ mode.
1. Configure the following settings:
●
test method: hard vacuum (see chapter “Test method”)
●
calibration type: internal (see “Calibration type”)
●
type of calibrated leak: internal (see chapter “Calibrated leak”)
●
calibration: operator (see chapter “Calibration function”)
2. Check the leak settings (leak rate corrected for temperature and time as needed) (see chapter
“Calibrated leak”).
3. Press the CAL button to start a calibration.
To stop a calibration, press the CAL button 3 times in under 5 seconds.
7.5.3 Calibration in hard vacuum test mode with 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.
Calibration with an external calibrated leak is advised when the reject point is far from the
internal calibrated leak value.
Calibration
To stop a calibration at any time, press the CAL button 3 times in under 5 seconds.
1. Configure the following settings:
●
test method: hard vacuum (see chapter “Test method”)
●
calibration type: external (see “Calibration type”)
●
type of calibrated leak: external (see chapter “Calibrated leak”)
●
calibration: operator (see chapter “Calibration function”)
2. Verify the setting for the external calibrated leak used (see chapter “Calibrated leak”).
3. As needed, correct the parameters of the external calibrated leak used (see the label for the cali-
brated leak or the calibration certificate).
4. Select the tracer gas for the external calibrated leak (see chapter “Calibrated leak”).
5. Check that the detector is in ‘Stand-by’ mode.
6. Carry out air inlet by pressing the [VENT] function key.
7. Check that the detector is in ‘Stand-by’ mode.
8. Press the CAL button to start a calibration.
9. Follow the instructions given by the leak detector.
–
Press [Next] to move to the next step.
At the end of the calibration, the detector returns to ‘Stand-by’ mode.
Operation
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