Transfer To Test - Agilent Technologies Helium User Manual

Technical Information

Transfer to Test

The value input and hidden keypad is to the right of the Transfer to Test feature.
Use it to set the pressure at which the system goes into Test.
The Transfer to Test setting can be adjusted to lower values for specific
applications. The limit on the maximum test pressure prevents the operator from
inadvertently setting the leak detector to transfer into test at too high a pressure,
which would result in excessive spectrometer contamination or ion source filament
failure.
Figure 36 Transfer to Test
Maximum Test
Pressure
The transfer pressure from the Test mode to the Fine Test mode is set at 100
NOTE
milliTorr (1.0E-1 Torr). You may wish to lower that value under certain
circumstances. The mid-stage transfer pressure limit is adjustable from 1 to 100
milliTorr via an RS-232 command (see ML-XFER and INIT-ML-XFER in Section A
"Communications Protocol"). The pressure limit is not adjustable using the display.
Agilent Helium Leak Detector User Manual
Determines the test pressure cross over point at which
the system transfers from Roughing into Test and then
into the Contra-Flow Test mode. In the Contra-Flow
Test mode, the gas sample is pumped through the leak
detector and swept across the high vacuum pump
foreline. The Contra-Flow mode allows for higher sensi-
tivity testing at exceptionally high test pressures.
The maximum test port pressure is 10 Torr.
Press the
value to access
its keypad
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