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Emerson Process Management GmbH & Co. OHG6-14
Instruction Manual
HASAxE-IM-HS
05/2006
6-2 Checking the Instrument's Setup
Note!
"Function" parameter factory setting is Off FS
(fail-safe) unless otherwise specified at time
of order.
Combining the different modes with setting
the threshold levels in a proper way gives
the operator the choice of programming diffe-
rent behaviours:
• Window mode: If the concentration
exceeds the limits defining a concentra-
tion window, an alarm is activated.
• High and high-high alarms: This mode
allows to set a prealarm level and a main
alarm level for increasing concentrations
• Low and low-low alarms: This mode allows
to set a prealarm and a main alarm for
decreasing concentrations.
Refer to the following paragraphs and figures
for detailed information on alarm settings!
Each threshold may be configured to be OFF,
a LOW or a HIGH alarm, utilizing the "Function"
parameter:
Off: Alarm function deactivated, output level
is digital "LOW" all the time.
Low: The moment, the currently measured
concentration goes below the specified
level, an alarm signal is activated.
Alarm signal level is digital "HIGH".
High: The moment, the currently measured
concentration goes above the specified
level, an alarm signal is activated.
Alarm signal level is digital "HIGH".
In addition the "Function" parameter supports
the fail-safe operation mode:
Fail-Safe means an activated alarm gives a
digital "LOW" level signal instead of a "HIGH"
level signal:
Off FS: Alarm function deactivated, output level
is digital "HIGH" all the time.
Low FS: The moment, the currently measured
concentration goes below the specified
level, an alarm signal is activated.
Alarm signal level is digital "LOW".
High FS: The moment, the currently measured
concentration goes above the specified
level, an alarm signal is activated.
Alarm signal level is digital "LOW".