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May 2019
Figure 4-3 Graph Showing no Alarm Activation with Spurious Noise
In
Figure 4-3
ultrasonic noise produced through normal maintenance procedures. Noise 3 is a longer spurious noise
of approx. 13 seconds typical of a pressure relief valve. Delay time is introduced to ignore spurious
noise spikes as the detector will reset when noise level drops below the alarm level before the delay
time is reached.
Figure 4-4 Graph Showing Alarm Activation with Spurious Noise and Leak
26
noise 1 and 2 are spurious noise spikes of approx. 1.5 seconds, typical of man-made
Reference Manual
00809-0100-3003, Rev AA
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