RIDGID metal detector Betriebsanweisung PDF herunterladen (Seite 59)

Installation

The metal detector is a highly sensitive RF measuring device, which is well screened from outside

interference and has excellent electronic discrimination against unwanted electromagnetic fields.

However, due to its sensitivity it is possible that other devices which emit high levels of RF noise at

the operating frequency of the detector could cause interference, thereby degrading the performance

of the detector.

It is therefore important to avoid siting the detector next to any devices which emit abnormally high

levels of RF interference if proper operation is to be maintained.

Radio Frequency Interference

A metal detector is, essentially, a Radio Frequency (RF) transmitter and receiver. As such it is

sensitive to RF noise in the general vicinity of the detector location. Whilst those frequencies not close

to the operating frequency of the detector will usually be filtered out (this includes most ‘walkie talkie’

frequencies, unless the transmitter is held very close to the detector aperture), it is not uncommon for

the control frequency (or multiple of it), used in modern speed controllers, to cause interference.

To reduce the risks of such interference causing false rejects or other symptoms of undesirable

operation at the metal detector, the following recommendations should be followed:

■

Always route speed controller input and output wiring away from the metal detector area.

NEVER put speed controller wiring in the same conduit or on the same supply as the metal

detector wiring.

■

Run speed controller wiring in the general vicinity of the metal detector in a rigid steel conduit

or use other techniques to ensure 100% screening of the cable.

■ Always follow the speed controller manufacturer’s instructions for installation, wiring,

screening and grounding.

In addition to following these guidelines, most speed controller manufacturers supply input and output

filters which can be fitted to the field wiring to dramatically reduce RF emissions if necessary.

All Loma metal detectors are designed, and tested, to meet the requirements of the FCC and the new

stringent European regulations for RF emissions, both in terms of not emitting excessively and not

being subject to undesirable operation in the presence of other equipment whose emissions also

meet the standards.

This approach allows Loma to offer stable operation even in RF noisy environments, provided the

other equipment is to the same standards and the field wiring is suitable ‘hard’.

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RIDGID metal detector Betriebsanweisung Seite 59