RIDGID metal detector Guia do Utilizador descarregar pdf (Página 114)

Operating Instructions

o Guidance on determining the number of passes to be used

For products that exhibit no product effect and where no Product Registration Photo-eye

is fitted, place each test wand type onto the product sample at the leading edge for the

first pass and then on the trailing edge for the second pass to ensure that the change of

reject timing point still results in the correct rejection of the product. A minimum of two

passes per test wand type is therefore suggested.

For products that exhibit no product effect but where a Product Registration Photo-eye is

fitted, you can place each test wand type anywhere within the product length. In this case

a minimum of one pass per test wand type is sufficient.

For products that exhibit a product effect, regardless of whether a Product Registration

Photo-eye is fitted, place each test wand type onto the product sample at the leading

edge for the first pass, in the middle for the second pass and on the trailing edge for the

third pass to ensure not only that the reject timing is correct for non photo-eye systems

but also to obtain better detection coverage of the product sample itself. A minimum of

three passes per test wand type is therefore suggested.

■ Fe Test

In this option you can enter the ferrous (chrome steel) test piece size in mm to be used for PV

testing.

Leave the option value blank if this test piece should not be used as part of the PV test.

■ Non-Fe Test

In this option you can enter the non-ferrous (brass) test piece size in mm to be used for PV

testing.

Leave the option value blank if this test piece should not be used as part of the PV test.

■ St. Steel Test

In this option you can enter the stainless steel (normally 304 annealed) test piece size in mm

to be used for PV testing.

Leave the option value blank if this test piece should not be used as part of the PV test.

■ False Threshold

The false threshold value is used to detect when metal test pieces are larger in size than

those specified by the PV test.

If this threshold is exceeded at any time during a test it does not count towards a successful

test. All PV test samples must be passed correctly for the PV test to be successful.

To ensure the correct false threshold value is entered, note the signal values obtained whilst

passing all the test pieces used. The ideal false threshold value is the largest signal obtained

plus a small margin added for error.

If you are not sure what margin for error to apply, test with the next size up test pieces, note

the values obtained and then set the threshold about midway between the largest signal value

from the test pieces to be used and the largest signal value from the next size up.

Note that PVS test pieces are not recorded in the Contaminants Log or included within the

reject count.

■ Sample in stats

Enabling this option includes the packs passed during the PV test process in the Batch Log

statistics.

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