Edwards ELD500 Series

D135-10-880C - Operation
Page 76
Maximum evacuation time
Main menu > Settings > Monitoring functions > Maximum evacuation time
This menu item is used to define when the gross leak message is to occur. The gross leak
detection process operates in two steps and the limits can be adapted as required.
This menu item is particularly useful in series testing under the same conditions at all times.
After pressing the start button the test sample is evacuated. If the pressure conditions
(p1 < 100 mbar) are not attained, or if the pressure does not drop low enough within the
periods of time specified here, the pump down process is terminated and the display will
indicate a message (see Troubleshooting, W75 and W76).
The periods which are selected in each case depend firstly on the desired reaction time for
the gross leak message, and secondly on the volume of the test sample and the effective
pumping speed.
If the evacuation time was set to endless, the oil level of the mechanical pump should be
checked more often.
Softkey No. 6: Pressure limits for vacuum mode
Setting for the pressure limits between evacuation, GROSS and FINE mode.
Softkey No. 7: Pressure limits for sniff mode
Definition of the upper and lower limit of the sniffer pressure
Softkey No. 2: 
Decreasing maximum evacuation time until p1 < 100 mbar. Within this period of time the
inlet pressure at the test flange must have dropped below 100 mbar. The duration may be
selected freely between 1 second and 9 minutes or can be set to endless. The default is 30
seconds.
Softkey No. 3: 
Decreasing maximum time until measurement. Within the period of this time the status of
measurement readiness must have been attained, that is, the inlet pressure must have
dropped below 15 mbar. The duration may be freely selected between 5 seconds and 30
minutes or can be set to endless.
Softkey No. 5: ?
Help text
Softkey No. 6: 
Increasing maximum evacuation time until p1 < 100 mbar
Softkey No. 7 
Increasing maximum time until measurement.