Eriez HI Installation and operating instructions

High Intensity (Model HI) Magnetic Filters
1
Installation, Operation
and Maintenance
Instructions
MMPM-440D
ERIEZ MAGNETICS HEADQUARTERS: 2200 ASBURY ROAD, ERIE, PA 16506–1402 U.S.A.
WORLD AUTHORITY IN SEPARATION TECHNOLOGIES
HIGH InTEnSITY
MaGnETIc FIlTEr

2
Introduction
This manual details the proper steps for installing, operating and maintaining the Eriez
High Intensity (Model HI) Magnetic Filters.
Careful attention to these requirements will assure the most efficient and dependable
performance of this equipment.
If there are any questions or comments about the manual, please call Eriez at
814/835-6000 for assistance.
©2017 ERIEZ MAGNETICS ALL RIGHTS RESERVED

High Intensity (Model HI) Magnetic Filters
3
Table of Contents
ERIEZ MODEL HI FILTERS
GENERAL.........................................................................................................................4
INSTALLATION ................................................................................................................5
ELECTRICAL ...................................................................................................................5
OPERATION.....................................................................................................................6
MAINTENANCE...............................................................................................................7

4
General
Eriez High Intensity Filters have evolved into an
extensive and highly technical product line. The basic
electro and permanent filters operate at about 1,500
gauss. Additional models have been added to the
line, providing fields up to and beyond 10,000 gauss.
Although any field intensity may be supplied, there
are several design points with basic characteristics
as follows:
1,500 gauss: These units have dry potted coils and
generally require no special cooling, or may use
permanent magnets.
2,500 gauss: These units may have dry potted coils,
but are generally filled with a transformer oil. If not, a
highly thermally conductive epoxy is used to fill the
magnet case.
5,000 gauss: These units are oil filled and include a
pump and heat exchanger.
10,000 gauss: These units require a hollow conductor
coil with coolant passed directly through the wire.
Although filters with magnetic fields higher than
10,000 gauss are known as High Gradient
Magnetic Separators, the magnetic design principles
remain the same. Hollow conductor wire coils may
be used to generate magnetic fields up to 25,000
gauss. Beyond that, superconducting magnets are
available that generate magnetic fields up to 50,000
gauss. Superconducting designs may be economically
justified at fields above 20,000 gauss and should
be considered.
Standard filters are sized based on nominal capacity
with water. The available capacities are 10, 25, 50,
100, and 200 gallon per minute (GPM). Model
designations are based on capacity and field strength.
For example a 25-15 is a twenty-five GPM, 1,500
gauss unit A “P” suffix, such as 25-15P indicates a
permanent magnet source. Capacity of filters varies
according to the viscosity or percent solids of the
slurry. Capacity of your filter has been selected based
on the specific material to be processed.
The matrix performs the separating function of the
magnet Standard filter assemblies consist of a stack
of 400 series stainless steel (ferromagnetic) expanded
metal plates. Other matrices may be made of screen
cloth, steel wool or steel balls.
FIGURE 1
TYPICAL 2,500 GAUSS HI FILTER
FIGURE 2
EXPANDED METAL MATRIX
CAUTION: STRONG MAGNET
This equipment includes one or more extremely
powerful magnetic circuits. Steel and iron tools and
other objects may be attracted suddenly and forcefully
to the magnets, creating the risk of serious pinch-
type injuries. Keep all mild steel and iron tools and
equipment well away from the magnets at all times.
When handling the equipment, do not allow hands,
fingers and other body parts to be caught between
magnets and nearby steel or iron objects.
If you use a heart pacemaker do not service or operate
this equipment because the magnetic field may affect
your pacemaker operation. Always stay at least 3 feet
(1 meter) away from the magnetic components.
The magnetic field may damage information stored
on credit cards, computer disks, and other magnetic
storage devices brought near the magnet.

High Intensity (Model HI) Magnetic Filters
5
Installation
Electrical connections are very simple as shown in
the following Figure 3.
When connecting the power leads to terminals
extra care must be taken. Two spark plug like
terminals are available for connecting power leads.
Two wrenches must be used when tightening the
nuts on the terminals. Torquing on the terminal
could result in the breakage of the terminal post or
wire inside the magnet. An otherwise unnecessary
factory service call would be required to open and
replace the terminal posts.
The voltage for which the filter is wound is shown
on the nameplate. Voltage more than ten percent
higher or lower than normal will affect the filter's
operation. Over voltage may cause the coil to
burn out. When voltage is low, the filter will not
be operating at full strength.
The HI Filter should be installed in an area which
has a free flow of air. Ambient temperatures should
average 70°F (21°C) and not consistently exceed
more than 90°F (32°C). Air temperatures higher
than this require special consideration and design.
Process fluid temperatures should also not exceed
this level. The electromagnets generate heat (all
power consumption goes to heat) and heat
transfer to process fluids should be considered.
Thermal soaking where the magnet continues
to release heat occurs for about four hours after
power down. Process fluids remaining in the
canister could be damaged by this heat.
Provide adequate overhead clearance to remove
the matrix when it becomes necessary.
Electrical
Standard electromagnetic HI Filters are designed
to operate from a 115 volt DC power source. A DC
switch will be required if the unit is to be operated
from an existing DC power source. This switch is to
be used to energize or de-energize the filter. Always
check to see that the filter is turned ON when it is
in use. An ON condition is indicated by the proper
current flow in addition to the voltage.
If the filter is to operate from rectified AC current, no
DC switch is needed. To turn the filter ON or OFF,
simply make or break the AC current supply to the
rectifier. This is by far the most common and
preferred way of supplying and controlling power
to the electromagnet.
FIGURE 3
BASIC ELECTRICAL SCHEMATIC
CASE TEMPERATURES MAY EXCEED 175°F
(80°C) AND BURNS COULD BE EXPERIENCED
WITH ACCIDENTAL CONTACT.

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An electromagnet generates a magnetic field based
on the amps and turns of wire in the coil. With a
constant voltage control the amp draw will decrease
as the coil heats and electrical resistance rises.
Normal drop in current to 70 percent of cold is
found with convectively cooled magnets. With force
cooled (oil is pumped) magnets a drop in current
to about 85 percent of cold is expected. Monitoring
of both voltage and current to the magnet is useful
to learn the normal operating conditions. A sudden
and significant change from the normal operating
conditions could indicate a partial coil failure.
A DC control known as a ‘constant current’ type
is available when the magnet has been specially
designed. In a constant current control the current
is maintained by increasing the voltage applied to
the magnet It is not possible to retrofit a standard
magnet with this feature.
Permanent magnet Hi Filters require no external
power source.
Installation (cont.) Operation
Standard HI Filter units are equipped with either
an NPT threaded or 150 lb, class flanged inlet and
outlet and the canister is rated at 150 psi. Batch
feeding is possible with an optional bowl feed
adapter in style B units.
HI Filters are similar to other types of filters in that
feed is processed for a period of time and then
cleaned or backflushed. Filter capacity is based on
the ability to remove magnetic contaminants, which
is usually constrained by velocity. Rating capacity
of a HI Filter varies from 7 to 150 GPM per square
foot of filter area. Cleaning or backflushing time
reduces the effective capacity of the filter. Time
before backflush has varied from as little as
6 minutes to more than a day.
For the basic bowl feed units the liquid is fed in at
the top where it spreads out evenly and passes
down through the filter stack, Cleaned material will
flow out at the bottom of the filter. In the bowl-type
units the normal cleaning method is by the removal
of the matrix. The field must be shut off and then
the matrix is removed and flushed with clean fluid.
Permanent magnet units operate in the same way
but the canister must be pulled through the magnet
field. In the larger units it may be necessary to use
a lever or small crane to pull the matrix.
The other units have sealed canisters which utilize
a pressure feed. Direction of the feed is often from
the bottom up, allowing maximum dispersal in
the matrix. When the velocity is higher, (>10 FPS
or 3 MPS) the direction of flow does not have a
significant impact on dispersal.
Pressure feed units are often coupled with an
automated valve system which allow timed
sequencing of the feed and flush cycles.
A normal cycle involves filling the canister and
continuous processing of material for a specified
period of time. This time is determined from tests
either on processed materials or in the laboratory,
The objective of these tests is to determine the
amount of time which passes before the breakthrough
of the matrix occurs. Breakthrough may occur either
with a sharply defined point or a steady increase in
contaminant in the processed fluid.
FIGURE 4
PERMANENT MAGNET BOWL TYPE HI FILTER

High Intensity (Model HI) Magnetic Filters
7
Maintenance
There are no moving parts requiring periodic
maintenance in the convectively cooled HI Filters.
Abrasive materials will eventually wear down the sharp
edges of the matrix. Should this occur, Eriez can
supply a replacement having the same magnetic
properties as the original.
Force cooled units have heat exchangers and
circulating pumps which require periodic maintenance
according to the supplied manufacturers literature.
Oil cooled units should be periodically checked for a
dielectric breakdown in the transformer oil (minimum
20 kV). The local electric utility should be able to
provide a source for this service. Refill the unit with
same oil as on the magnet housing tag.
Water cooled hollow conductor coils have a self
monitoring deionizing system in the primary loop water
path. The deionizing system would require the ion
exchange tank to be periodically changed out.
An alternative point for flushing may occur when an
increase in the pressure drop across the matrix occurs.
This is typically seen when large quantities of ferrous
contamination are present.
When the point for flushing the matrix is reached,
feed is stopped and clear fluid is processed for one or
two canister volumes. This minimizes the lost product
which is in the canister and piping at backflush time.
The magnet is then de-energized and a high velocity
cleaning fluid is injected opposite the flow of the feed.
For situations where the matrix is not easily cleaned the
flushing direction may be reversed one or more times.
Injection of compressed air may improve cleaning
by causing a scrubbing action. For especially difficult
applications a demagnetization cycle may be built into
the power supply.
Automatic systems are available to control the entire
feed cycle.
FIGURE 5
TYPICAL FORCED COOLING SYSTEM

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©2017 Eriez Magnetics All Rights Reserved
World Authority in Separation Technologies
Headquarters: 2200 Asbury Road, Erie, PA 16506-1402 U.S.A.
Telephone: [phone] • Fax: [phone]
Web Site: http://www.eriez.com e-mail: [email protected]
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