Thermo Scientific Oretronic III, Руководство по эксплуатации и обслуживанию

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Thermo Fisher Scientific Introduction 1-1
REC-4105 Rev L
Chapter 1 Introduction
This chapter introduces the Oretronic III Tramp Metal Detector (TMD).
It gives an overview of the device’s capabilities, describes its basic
functionality, and lists its technical specifications.
The Oretronic III Tramp Metal Detector (TMD) detects the presence of
tramp metal in bulk material being transported on a conveyor belt.
Detected tramp metal can then be removed from the process stream
manually or automatically by mechanical means. Removing the tramp
metal protects crushers, material handlers, and process equipment from
the damage it may cause.
This highly reliable system detects all types of tramp metal that could be
found in bulk material on belt conveyors even when it is buried in wet,
conductive materials. Tramp metal could include such things as bucket
teeth, manganese steel mantles, bore crowns, bar scrap, chains, and
tools. The bulk material (or burden) can be product such as iron pellets,
minerals, aggregates, coal, or coke.
The Oretronic III TMD can be installed on conveyors with speeds up to
1,200 ft/min (6.1 m/s). In addition, because it is insensitive to materials
with high magnetic permeability and electrical conductivity, this
detector can be used in applications where conventional metal detectors
produce an unacceptable false alarm rate.
The Oretronic III TMD has a microprocessor-based control unit that
automates system setup and calibration. The operator interface provides
easy-to-read indicators, a touch panel keypad designed to simplify
setting up, and maintaining the system.
The TMD operates by generating a pulsed magnetic field (the primary
magnetic field) that is radiated from its transmitter coil. This field
generates an output signal in the receiver coil (see Figure 1-1).
When the pulse is turned off, eddy currents induced in tramp metal pro-
duce a secondary magnetic field. This new field also generates an
output signal in the receiver coil. The detector measures the effect of
this secondary magnetic field only during the time the primary field is
inoperative.
Overview
Theory of
Operation