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GA10218_0101 - 5/2002
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level is taken over anew, provided the PhoeniXL has been running in the
Standby or Vent status for at least 20s.
STOP / VENT-buttonThe STOP/VENT-button has two different fuctions, depending on how
long it is pressed:
STOP function
Based on the measurement mode of the PhoeniXL, a brief press of the
STOP-button interrupts the evacuation process of the test sample and the
measurement mode is interrupted. The duration of this key press must be
no longer than the time which is defined in the menu. The default time is
1.5 s. The PhoeniXL will return to the Standby mode, i.e. all valves except
valve V2a are closed. This condition is indicated to the operator by the
green LED in the START-button which is turned off.
After pressing the STOP/VENT-button the display will indicate the mes-
sage “Standby Vacuum”.
VENT function
When pressing the STOP/VENT-button for a period of time which exceeds
the time as defined in the menu, the connected test sample is vented as
soon as this time has elapsed. This is done by opening of the venting valve
V3. This operating mode is indicated to the operator by the green LED in
the STOP/VENT-button which comes on.
The venting valve may be closed again by pressing the STOP/VENT-but-
ton briefly once more. The PhoeniXL will return to the Standby mode. The
“Vent Vacuum” display is turned off.
ZERO-buttonA constant leak rate reading may be suppressed by pressing the ZERO-
button, i.e. a constant helium background within a test sample. This but-
ton is only active in the measurement mode. (see Chapter 4.1.2.4)
In AUTO mode and ZERO activated the indication limit is set to the highest
sensitivity range, for. ex. 1E-12 mbar l/s
The exponent on the remote control is retained in the case of “Zero” when
the leak rate display always remains at the upper decade of the bargraph
display. If the leak rate is indicated in the lower decade, the exponent is
decremented by one in the case of “Zero”. Thus the displayed leak rate
can always be suppressed by at least one decade so as to increase reso-
lution.
Example:
A leak rate of 4,1 · 10
-8
mbar l/s can be displayed in two ways on the
remote control:
In both cases the exponent -8 and the bargraph display is dark after pres-
sing ZERO.
With the background set to off pressing the zero button saves the cur-
a) The exponent indicates -8 and the narrow part of the bargraph dis-
play is fully on the wider section is on up to number 4.
b) The exponent indicates -7 and only the lower narrow section of the
bargraph display is on up to number 0.4.
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