Eriez 1250 ANALOG, Installation, Operation And Maintenance Instructions

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The Interface Module interconnectors all external
signals and power to the Electronic Module. This
module houses the power transformer, solid state
relays and interface circuit board. Visible on the face
of the Interface Module are system fuses and two
terminal blocks for external wiring; all are clearly
identified. The right terminal block, a 14-pin, 3/8"
center screw type, connects the Detector’s external
transducers and signals. The left terminal block, a
6-pin, 7/16" center screw type, is used for all con-
nections handling the A.C. Iine voltage.
ELECTRONIC INTERFACE
MODULE MODULE
Size: 10.5" x 8" x 1.5" Size: 11" x 4.5" x 4"
(267 x 203 x 38 mm) (279 x 114 x 102 mm)
Weight: 2.5 Lbs (1.1 kg) Weight: 4.75 Lbs (2.2 kg)
SEARCh COIL ASSEMBLy
The Search Coil Assembly includes receiver and
transmitter antennas, mounting frame and inter-
connecting cables. Each assembly is custom de-
signed to suit its particular application. Please refer
to the Frame Assembly Diagram.
RECEIvER COIL
The receiver coil is typically located under the con-
veyed material within 1" (25 mm) of the conveyor
belt. An aluminum enclosure shields the recover
coiI from electromagnetic interference. Mounting
tabs are located on the aluminum shield to attach
it to the material handling structure.
TRANSMITTER COIL
The transmitter coil is located opposite and parallel
to the receiver coil. The distance between the trans-
mitter and receiver (aperture) is typically 2" - 4" (51-
162 mm) greater than the maximum burden depth
of the processed material. Strong, yet lightweight,
molded fiberglass is used for applications that do
not have vibrating or moving metal objects nearby.
A shielded version may be recommended if addi-
tional protection from electromagnetic interference
is required.
MOUNTING fRAME
Two types of mounting frames support the anten-
nas on troughed and slider bed conveyors. Special
designs are available to accommodate other types
of material handling systems. The swing-away as-
sembly shown in Figure 3, is used with non-shielded
transmitter coils or when the transmitter must be
protected from oversized conveyed materials. The
fixed assembly, shown in Figure 4, is used for high
sensitivity applications or when a shielded trans-
mitter is required.
INTERCONNECTING CABLES
Shielded cables connect the receiver and transmit-
ter to the Main Control Enclosure. The cables are
cut to a specified length at the Factory.
Any alter-
ation to the cables may degrade the Detector’s
performance. Consult the Factory if other cable
lengths are required.
CLIp DETECTOR (If AppLICABLE)
The clip detector consists of a compact sensor head
and mounting bracket. The clip detector senses the
proximity of repair clips as they pass over the sen-
sor’s head. Once the clips are detected, the Metal
Detector is desensitized or disabled for a period
which has been preset at the factory.
part I - Operation & Description
(cont.)