Pfeiffer ASM 340 - Bypass Option and Regeneration Function

Advanced settings
45
Fig. 25: "Memo function" screen using a function key
7.4.8 Zero activation
This function is used to help the operator identify very small leak rate variations in the
surrounding background or to dilate small measured leak rate fluctuations on the analog-
ical display.
 To activate the function manually, press the [Zero].
● Press once: activate/deactivate zero by quickly pressing the [Zero] function key.
● Press > 3 s:
– activation: quickly press the [Zero] function key. Each time the key is pressed
quickly, a new zero is carried out.
– deactivation: press > 3 s the [Zero] function key.
7.4.9 Bypass Option
Prerequisites:
● Detector with the 37 pin I/O board (option/accessory)
● Bypass kit (accessory) and its Bypass pump (at customer's expense), connected to
the detector.
For more information about the Bypass and installing it on the leak detector, see the Op-
erating instructions included with the kit.
 From the "Settings" screen, press [Advanced] [I/O Connector] [Quick View] and
check that the following inputs/outputs are set (initial settings):
● Setting required for using the Bypass
● Digital Input 32 – Ground = Bypass option
Display time Setting required if the function is active.
 Activate the display time delay.
• On = the value of the measured leak rate flashes for the set duration.
• Off = the value of the measured leak rate will flash until a new test begins.
 Set the display duration.
From the "Settings" screen, press [Test] [Memo Function].
For quick access from the control panel, set a function key for [Memo] (see 7.7.2).
From the "Settings" screen, press [Test] [Zero Activation].
Activation  Activate the function (activated if ’automatic’ is set).
Zero Exit Setting required if ’operator’ is set.
 Set the type of keystroke for exiting the function (see below).
Trigger Setting required if ’automatic’ is set.
 Set the function trigger factor.
Value Setting required if ’automatic’ is set.
 Set the function trigger value.
To launch the function manually from the control panel, set a function key to [Ze-
ro] (see 7.7.2).
Using this function is recommended when the background of the tracer gas is
stable and significant.This function is used to measure a leak rate that is lower :
- 2 decades in hard vacuum test mode 5·10
-13
Pa·m
3
/s (5·10
-12
mbar·l/s) maximum
- 3 decades in sniffing mode (5·10
-10
Pa·m
3
/s (5·10
-9
mbar·l/s) maximum
than the detector’s background when the detector is no longer in roughing.