Emerson Process Management GmbH & Co. OHG 3-31
X-STREAM X2FD
Instruction Manual
HASXMDE-IM-EX
01/2015
3
Startup
3.9 Checking the settings
Note!
Off FS is preset by default unless otherwise
specifi ed on time of order.
• High pre-alarm and main alarm: A pre-
alarm and a main alarm are set for rising
concentrations.
• Low pre-alarm and main alarm: A pre-
alarm and a main alarm are set for falling
concentraions.
For more detailed information on alarm set-
tings, please see the following instructions
and illustrations.
The function of each limit can be set in the
“Function” parameter:
Low: An alarm is triggered if the measured
value drops below the set limit.
The alarm relay is activated.
High: An alarm is triggered if the measured
value exceeds the set limit.
The alarm relay is activated.
Off: The alarm function is deactivated and
the corresponding relay is not activa-
ted (remains dead).
The “Function” parameter also supports the
“ Failsafe” operational mode:
Failsafe (FS) means that the alarm relay is
activated during normal operation. This is
the reverse of the usual function in which a
relay is activated when an alarm is triggered.
In FS mode, if an alarm is triggered, the relay
is switched off. In this way, an alarm is also
triggered if, for example, the analyzer loses
power. Cable breaks can also be detected in
this way. Options are:
Low FS: An alarm is triggered if the measured
value drops below the set limit.
The alarm relay is deactivated.
High FS: An alarm is triggered if the measu-
red value exceeds the set limit.
The alarm relay is deactivated.
Off FS: The alarm function is deactivated and
the corresponding relay is activated.
Various different behaviours can be program-
med using combinations of operational modes
and limit settings:
• Window mode: An alarm is triggered, if
the concentration drops below or exceeds
the limits of a concentration window, .
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