Analog Output; Relative Sensitivity - Siemens AS 100 Instruction Manual

This table provides a guideline for suitable wire gauges where distances are
considerable.
Maximum distance between Sensor and supply (24V or Control Unit)
AWG
24
22
20
*
nominal wire size

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 time
constant. The minimum load impedance is 100 KΩ. Refer to Installation on page 6 or
Interconnection on page 9.

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 AS 100 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.
Page 10
wire size
mm
7 x 0.20
7 x 0.25
10 x 0.25
SITRANS AS 100 – INSTRUCTION MANUAL
2
meters
mm *
0.22 500
0.35 800
0.5 1200
distance
feet
1600
2600
3900
7ML19985DM02