Siemens sitrans Manual de instrucciones - Página 14

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This table provides a guideline for suitable wire gauges where distances are

considerable.

Maximum distance between Sensor and supply (24V or Control Unit)

AWG

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

7 x 0.20

7 x 0.25

10 x 0.25

SITRANS AS 100 – INSTRUCTION MANUAL

meters

0.22

500

0.35

800

0.5

1200

distance

feet

1600

2600

3900

7ML19985DM02