Signal Processing; Evaluating Acoustic Channels - Siemens SITRANS DA400 Operating Instructions Manual

Signal processing

7.1

Evaluating acoustic channels

Introduction
Essentially, the four sensor inputs are evaluated according to the same principle, with the
only differences being in the signal names and/or the associated parameters. If a channel is
disconnected due to its configuration (P.1, P.2, P.3 or P.4 set to "oFF"), the measured value
is set to "0" and no alarm is generated.
The evaluation takes place in two steps:
1. Calculation of the measured value as shown in the "Block diagram for calculation of the
2. Formation of the alarm messages as shown in "Block diagram for the formation of alarm
SITRANS DA400 for material flow monitoring with protection against explosion
Operating Instructions, 09/2007, A5E00841152-01
measured value" figure.
messages" figure.
7
59