Inficon Ecotec E3000, Technical Handbook

Page: 71 / 146

Equipment Settings
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Flow limits
In this submenu the minimum and maximum gas flow through the capillary is
entered.
If the actual gas flow drops below this limit (e.g. if the capillary becomes partially
blocked) or exceeds this limit (e.g. if the sniffer line is damaged so that ambient air is
sucked in) an alarm is issued.
The closer the
LOWER FLOW LIMIT
is set to the actual gas flow (160 sccm) the more
sensitive the Ecotec E3000 will respond to beginning clogging of the filters and the
sniffer line itself.
The closer the
UPPER FLOW LIMIT
is set to the actual gas flow the more sensitive the
Ecotec E3000 will respond to damages to the sniffer line.
The
LOWER FLOW LIMIT
can be set to values between 0 and 160 sccm.
Default value is 100.
The
UPPER FLOW LIMIT
can be varied between 160 and 999 with a factory default
value of 250.
Notice: The flow through the sniffer line depends on the atmospheric pressure. If
operated at high altitude the flow through the sniffer line may drop
significantly (approx. 20% per 1000 m [3000ft] altitude). In this case, please
adjust the flow limits accordingly.
Sensitivity check
S
ENSITIVITY CHECK
is a monitoring function which will help to ensure that the
sensitivity of the Ecotec E3000 will always be sufficient.
In the
SENSITIVITY CHECK
submenu the sensitivity check can be enabled or disabled.
With this setting the entire gas flow from the tip of the sniffer into the sensor is
monitored and at the same the software checks the Ecotec E3000 to determine if it
in turn determines the correct signal amplitude.
Running of this function ensures that the Ecotec E3000 will not become insensitive
without this being noticed by the user.
If sensitivity changes, E30 will be displayed. In this case, please recalibrate the
Ecotec E3000 to restore sensitivity (see Section
3.5 ). The error message will be
repeated every 15 seconds until a re-calibration is started.
Notice: It is highly recommended to always keep this function enabled. This
function should only be disabled when operating in an Argon-free
environment as the Argon signal is used for monitoring.
Default value: enabled.
Fig. 4-13 Changing the flow limits of the sniffer line