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GENERAL

Carefully study the following sections; a little caretaken during installation will avoid the detectorsperformance becoming severely impaired.

Most of the detectors high frequency magnetic fieldis contained within the metal case of the detectorhead. Unavoidably there is some leakage of themagnetic field from the aperture of the detector.

It is the effect of the leakage magnetic field on thesurrounding metalwork that may influence thedetectors performance and can give rise toinconsistent performance.

A little care when installing the detector will berewarded by a consistent, highly reliable metaldetector performance.

MECHANICAL INSTALLATION

Metal Free Zone (MFZ)

To achieve optimum metal detector performance, anarea surrounding the aperture of the detector knownas the MFZ should be kept free of metal.

The size of the MFZ will be dependent upon theaperture height (AH), the type of detector and theoperating sensitivity.

Stationary metal may be positioned closer to thedetector than moving metal. MFZ guidelines forstandard series detectors are shown in Figure 4.Please consult the product data sheet for the MFZof other types of metal detector.

Fig 4 Metal Free Zone Guidelines

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Construction of the Detector Installation

The design and construction of the metal detectorsupport framework will influence the performance ofthe detector.

Follow the guidelines below to obtain the bestperformance.

- Insulate one end of the roller from theconveyor frame.

- This can take the form of a plastic insulationplate and washers on the bearing mountingblock or a plastic extension to the end of theroller shaft (see Fig. 6).

- The conveyor frame should be of weldedconstruction rather than bolded sections.

- Insulate/isolate all items bolted to the frame(eg guards) using non-conducting insulators.

- Mount the detector to its support frameworkusing the four plastic insulation sets suppliedwith the detector.

- Avoid passing metal conduit or electricalcables through the metal free zone or nearthe aperture of the metal detector.

- See Appendix E for the theory behind theconstruction of the metal framework.

A typical installation is shown in Figure 5.

Positioning the Detector Head

Better sensitivity will be achieved if vibration fromother machines is isolated from the detector.

- Avoid supporting the detector head on or nearvibrating structures and/or machines subjectto mechanical shock.

- Position the detector head to allow easyaccess to the control panel.

- Position the detector to allow removal of thecontrol unit for servicing.

Electrical Connections

WARNING

If the detector is supplied as part of a system,read all the system literature beforecommencing electrical installation

In order to reduce the possibility of problems withelectrical interference, do NOT run any metaldetector cable next to other cables carrying switchedor heavy loads.

Electrical connections to the power unit are asshown in Figure 8

Power connections to the power filter (where fitted)are shown in Figure 9.

Arrangement of the gland assemblies for connectingthe power cable to the power supply unit are shownin Figure 10.

Note. When installed correctly, the detector headshould be electrically insulated/isolated from thesupport structure and connected to earth/groundonly through its own electrical connections.

These instructions are for connection to TN(EN60950:1992) power distribution systems only.For connections to other power distribution systemsplease contact your supplier.

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Fig 5 Typical Metal Detector Conveyor

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Fig 6 Bearing Block And Mounting Foot Insulation

Fig 7 Belt Joints

Typically 100mm

150mm