Pfeiffer Vacuum ASM 340 - Set Points

8.1.2 Set points
This menu is used to define the different set points (pollution, test, pressure).
Access: Menu [Measurement] [Set points] Choice -
Setting limit
1)
Pollution To be enabled
This is a safety device for the detector. It prevents too much leaked tracer gas from penetrat-
ing the detector. We recommend setting the pollution set point to a maximum of 4 decades
above the reject set point. If the leak rate rapidly increases above the pollution set point, the
cycle stops automatically and the leak detector returns to ‘Stand-by’ mode.
The function is only available with the ‘hard vacuum’ test method.
Useful function if the part or installation to be tested is likely to have gross leaks.
Enabled
Disabled
To be set
1 · 10
-19
–
1 · 10
+19
Hard Vac-
uum Set
Points
Reject point To be set for each tracer gas
The reject point is the acceptance set point for parts.
● Measured leak rate < reject point: part accepted
● Measured leak rate > reject point: part rejected
The set point is not displayed on the main screen or graph
screen when the detector is in ‘Stand-by’ mode.
1 · 10
-13
–
1 · 10
-06
Warning point To be enabled
The warning point is an intermediate set point defined ac-
cording to the reject point. It indicates that the user is ap-
proaching the reject point, but the part tested is good.
The set point is not displayed on the main screen or graph
screen when the detector is in ‘Stand-by’ mode.
Display of the test result: see details below.
Enabled
Disabled
To be set
Example: reject point = 5 · 10
-5
-> if 20%, warning point =
1 · 10
-5
0–100%
Sniffer set
points
Reject point To be set for each tracer gas
The reject point is the acceptance set point for parts.
● Measured leak rate < reject point: part accepted
● Measured leak rate > reject point: part rejected
The set point is not displayed on the main screen or graph
screen when the detector is in ‘Stand-by’ mode.
1 · 10
-12
–
1 · 10
+06
Probe Clogged To be set
The probe clogged set point is used to verify that the sniff-
er probe (accessory) is operational. When the probe flow is
below the ‘Probe clogged’ set point, a code is displayed to
inform the operator.
1 · 10
-19
–
1 · 10
+19
Warning point To be enabled
The warning point is an intermediate set point defined ac-
cording to the reject point. It indicates that the user is ap-
proaching the reject point, but the part tested is good.
Display of the test result: see details below.
Enabled
Disabled
To be set
Example: reject point = 5 · 10
-5
-> if 20%, warning point =
1 · 10
-5
0–100%
1) Initial setting: see chapter “Tree diagram to the Settings menu”
Settings menu
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