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Operate
December 2020
Figure 3-1: Suggested Alarm Levels
A. Alarm level (dB), 6 dB above background sound level
B. Background sound level (dB)
Figure 3-1
for known background sound levels. The values shown have been found to provide
sufficient immunity against most spurious alarms; however, take care to survey the area of
installation for potential spurious noise.
If you don't know background levels, use typical historical process background levels along
with a safety factor. Contact an Emerson representative for historical values and guidance.
You can set alarm levels in the detector (via HART
Most installations set the alarm levels in the control system. However, please note that the
best practice is to have the control panel and the GDU-Incus's internal alarm level to
always mirror each other. The reason for this is when the detector is in a sensor fault
condition, the detector's mA output will be a constant 2 mA and will not change to the real
30
shows the suggested alarm level settings (6 dB above background sound level)
Reference Manual
00809-0100-3003
®
/TREX/AMS) or at the control panel.
GDU-Incus
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