System Overview; Introduction; 14 Mm Proximity Transducer System - GE Bently Nevada 7200 Series Installation Manual

1.1 INTRODUCTION

The 7200 Series 14 Millimetre Proximity Transducer System is a noncontacting, shaft vibration and
relative position measurement system. The system includes a probe and Proximitor. Figure 1-1
shows a typical system.
Figure 1-1. 14 mm Proximity Transducer
System
metres (16.4 or 29.5 feet). All cables are trimmed to an electrical length which can be longer or
shorter than the stated physical length. Cables are available with or without ETFE (fluoropolymer)
armor.
The probes come with the serial number and part number printed on a label. The label is protected
by a piece of clear FEP tubing. During installation, user identification can be placed under another
piece of shrinkable FEP tubing. The tubing is shrunk when heat is applied.

1. SYSTEM OVERVIEW

The transducer system measures the gap between the
probe tip and an observed metal surface and converts
this distance to a proportional negative dc voltage.
The system measures both static (fixed) and dynamic
(changing) distances. The output signal is fed to a
monitor to determine such things as radial vibration
and axial thrust position.
Probes are available in different configurations to
accommodate a variety of applications and to aid in
installation. The probe tip is approximately 14 mm
(0.55 inches) in diameter. The system offers a linear
measuring range of 160 mils (4.06 mm) beginning at
20 mils (0.51 mm) from the probe face. Also, the
system scale factor is 100 mV/mil (3.94 V/mm).
Two Proximitor types are available, each calibrated
to a specific cable electrical length. Probe cables are
designed to achieve a system length of 5.0 or 9.0
Section 1 - SYSTEM OVERVIEW
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