Siemens SITRANS AS100 Operating Instructions Manual page 25

Analog Output
The Sensor provides an analog output proportional to the level of acoustic emission activity. As
the level of acoustic emission activity is a relatively good indication of process or mechanical
activity, the output is suitable as an input to devices such as dataloggers chart recorders and
programmable logic controllers.
The output is 0.08 to 10V (nominal), dc coupled, short circuit protected with a 60 μs
timeconstant. The minimum load impedance is 100 KΩ. Refer to Installation. (Page 15)
Relative Sensitivity
The sensitivity of acoustic emission is affected by temperature. In most applications this is not a
concern when considering the much greater changes in signal level due to changes in flow.
However, it is important to be aware of the effect.
The sensitivity of the SITRANS AS100 Sensor decreases with increasing temperatures at a rate
of approximately 0.5% per degree Celsius.
For example, if the temperature of the standard Sensor increased from 20 °C to 50 °C, its
sensitivity would decrease by 15%. If the Sensor were to be used to monitor flow changes over
such a temperature range, you should set an associated alarm setpoint at least 30% away from
the normal operating level measured at 20 °C.
SITRANS AS100
Operating Instructions, 06/2016, A5E31952194-AB
Interconnection
23