Emerson Machinery Health PR 642 Series, Installation Manual

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3 Application and Design
3.1 The Measuring Chain
Together with signal converters of the series CON 0x1, integrated converters of the MMS
3000 series, or the CSI 9360 transmitter, the sensors PR 6422 to PR 6426 form eddy
current measuring chains for contactless distance, vibration and speed measurements.
Different types of sensors and converters allow an optimal adaption to the requirements
of the machine to be monitored.
A additional electronic components, like the CSI 6500 system, allow static and dynamic
distance measurements, which means it is possible to measure slow axial displacements
and quick axial shaft vibrations of rotating machines.
To achieve a high accuracy, the measuring chains consisting of both converter and sensor
are adjusted together and delivered as complete measuring chain.
3.2 The Sensors
The PR 642x series includes five eddy current sensor types in different variants as shown in
chapter
Order Matrix .
Which sensor type is applicable for a measuring application depends on several
requirements as desired measuring range, available measuring track, and maximum
environmental temperature.
The characteristics of the measuring chain are adapted to the material mainly used for
turbo machinery (reference material: 42 Cr Mo 4, according to SAE 4140). The standard
adjustment of the measuring chains is generally related to this material; during installation
at the machine, you only need to adjust the distance between the head of the sensor and
the measuring target. The signal output of the converter determines how you should
adjust the sensor.
Installation Guide Application and Design
MHM-97857 January 2020
MHM-97857, Rev 1.5 11