Emerson Rosemount FCL, Reference Manual

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d. Setting the interval timer parameters.
2. Simulating an alarm means making the transmitter energize or de-energize an
alarm relay.
5.4.2 Definitions
Assigning
alarms There are four alarm relays. The relays are freely assignable to any sensor
and to either the measurement (for example, chlorine) or temperature.
Alarm relays can also be assigned to operate as interval timers or as fault
alarms. A fault alarm activates when the transmitter detects a fault in
either itself of the sensor.
Fault alarm A fault condition exists when the transmitter detects a problem with the
sensor or with the transmitter itself that is likely to cause seriously
erroneous readings. If an alarm was programmed as a fault alarm, the
alarm activates. At the same time, a fault message appears in the main
display.
Alarm logic,
setpoints,
and
deadbands See Figure 5-1 and Figure 5-2 .
Figure 5-1: High Alarm Logic
A. Chlorine, ppm
B. Alarm activates
C. Deadband = 0.3 ppm
D. Alarm deactivates
E. Time
F. High alarm setpoint
The alarm activates when the chlorine concentration
exceeds the high setpoint. The alarm remains
activated until the reading drops below the value
determined by the deadband.
Reference Manual Programming the transmitter
00809-0100-3412 May 2019
Rosemount FCL 1056 47