Siemens SITRANS DA400 Operating Instructions Manual page 15

Figure 3-2
Figure 3-3
L
0
L
1
L
D
The measurement always refers to the operating noise of the pump. The measurement is
carried out in the ultrasonic range. In the ultrasonic range, the operating noise of the pump
and the closing noise of the valves are attenuated. Crosstalk between neighboring valves is
also attenuated.
SITRANS DA400 for oscillating positive displacement pumps with protection against explosion
Operating Instructions, 10/2007, A5E00841127-01
Sensor signal (a) and sound pressure level (b) on an intact valve
Sensor signal (a) and sound pressure level (b) on a defective valve
Sound pressure level produced by load-dependent operating noise of the pump
Sound pressure level produced by the operating noise of the pump as well as a leak
Is the measured value of the acoustic diagnostics unit and corresponds to the additional noise
caused by the leak
Description
3.4 Mode of operation
15