 In
1981, PAC's introduction of integral electronic sensors was a major step
forward in industrial applications of Acoustic Emission. These transducers
were specifically engineered to attain high sensitivity and have the capability
to drive long cables without the need for a separate preamplifier. The elimination
of separate preamplifiers, cables and vulnerable connectors greatly improves
the reliability in tough environments and significantly reduces set up time.
Therefore, it is practical to permanently mount these sensors on pressure
vessels and piping for continuous monitoring.
Incorporating a low-noise input, 40 dB preamplifier and a filter all
inside the sensor housing, our integral preamp sensors operate at 60,
150, 300 or 500 kHz resonant frequencies or wideband. Their integrated
Auto Sensor Test (AST) capability allows the sensors to pulse as well
as receive. This feature allows you to verify sensor coupling and performance
at any time throughout the test.
All these sensors are completely enclosed in metal stainless steel (or
aluminum) housings that are treated to minimize RFI/EMI interference.
Care has also been taken to thermally isolate the critical input stage
of the preamplifier in order to provide excellent temperature stability
over the range of -35º to 75º C.
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