SmartAlarm Instruction Manual Rev 2
Page 84 of 115
Additional Features
Automatic Reset
Once a channel has been acknowledged and its input has returned to normal
the alarm can be set to automatically reset without the operator having to
press the reset pushbutton.
Non Latch Sequence
– (No Lock In)
Alarms can be set to non lock-in, which allows the alarm to automatically
return to the non alarm state as soon as the signal input returns to normal.
Ringback Sequence
Ringback sequence is used to inform the operator both visually and audibly
that an alarm condition has cleared and the channel can be reset to its normal
off state. When a contact returns to normal the associated window will flash at
approx ½ the speed of a normal alarm and the audible will sound. This
identifies the specific alarm and informs the operator that the alarm can be
reset to its normal off state.
First Up Sequences
When monitoring devices with interlinked functions such as a turbine or
compressor it is often important to know the specific alarm that occurred first,
as it will invariably result in cascade of secondary alarms. This allows the
operator to focus on the root cause of failure and therefore limits the
downtime and associated costs. This is achieved by having the first-up alarm
flashing in a different manner compared to the subsequent alarms. Four
different first-up sequences are available F0, F1, F2 and F3 as detailed below
and in the following sequence tables.
F0
The standard mode adopted by RTK Instruments, which indicates the first-
up alarm by flashing at twice the rate of subsequent alarms.
F1
In this mode subsequent alarms appear in the acknowledged state, hence
they do not flash. The audible device does not operate when subsequent
alarms occur, unless still operating from the first alarm. The acknowledge
pushbutton will reset the first-up indication.
F2
In this mode all subsequent alarms do not flash, they will however operate
the audible device. The acknowledge pushbutton will reset the first-up
indication.
F3
In this mode initial alarms appear with an intermittent flash rate and
subsequent alarms flash at a steady rate. On acknowledge subsequent
alarms revert to the steady on state and only the first alarm continues to
flash at a slower rate.
Please note auto reset and non lock- in functions are not recommended when
using first up sequences as the true sequence of events cannot be
guaranteed
.
The most common sequences are detailed below:-
