INFICON Protec P3000(XL) Helium Leak Detector - Manual (Page 63)

Equipment Settings
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4.4 Settings Sub-menu
In the settings sub-menu several settings which are important for the leak testing
procedure can be edited.
4.4.1 Vacuum & Access
In the Vacuum Access sub-menu setting monitoring functions like the ZERO function,
the flow limits and the contamination limit setting can be edited.
Zero time
The ZERO function is automatically updated when the background decreases so that
negative values will never be displayed, thus avoiding unintended missing of leaks.
The
ZERO TIME is the time the leak rate has to be negative in order for the Protec
P3000 to update the background level. The ZERO TIME can be set to values between
1.0 and 9.9 s.
Default value: 5.0 s
Contamination Limit
The Protec P3000 offers a protection mode against high helium concentrations
(contamination with helium).
This feature should be used to prevent the sensor from accelerated aging when
seeing large helium concentrations very frequently. The
CONTAMINATION LIMIT can be
set to levels of LOW , NORMAL AND HIGH . The contamination limit function will track the
accumulated amount of helium sniffed over the last couple of seconds. If this
accumulated amount of helium exceeds the preset level (
LOW , NORMAL , HIGH ) the
message „contaminated“ will be displayed until the amount of helium in the system
has decreased again sufficiently. However, the lower the
CONTAMINATION LIMIT setting
the smaller the largest possibly detected leak will be.
Notice You should start with the CONTAMINATION LIMIT set to LOW . If you feel that
you get the „contaminated“ message too often, you may increase the
CONTAMINATION LIMIT by one level at a time (to get the best usage out of
your Wise Technology Sensor).
Default: N ORMAL
The lower the contamination limit is set, the longer the life time of the Wise
Technology sensor of the Protec P3000.