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PRODUCT EFFECT APPLICATIONS
Wet/moist product, ie meat, cheese, soups etc
generate product signals when passed through the
detector. At setting Phase 0000 the signal will be
clearly visible on the LED Bar graph display.
With this type of product there are two alternative
settings for the detector. Without phase discrimination
(ie phase 0000) and with phase discrimination, ie
phase aligned to the product.
The most favourable condition is ascertained by
setting the detector to both conditions and comparing
the results.
Before adjusting the detector ensure that the product
is passing through the detector in its normal manner.
Note:– the product should be continually moving, the
detector will not operate with standing/stationary
product in the aperture.
If the product is a continuous length/strip, the worst
case product effect is given from the leading
edge/face of the product. Product fully spanning the
detector head gives a much reduced signal.
For the purpose of setting up the detector it is usual to
use the worst case product effect conditions. This will
necessitate setting up to the leading edge/face signal.
Similar circumstances exist with individual or cartoned
products. The worst case product effect occurs when
the detection senses the change from full product to
no product, ie the gap between products.
It is recommended that the detector is set up initially
to worst case product effect conditions. With
experience it may prove possible to increase the
sensitivity setting without having to re-adjust the
phase setting.
Minimising Product Effect Signal without the Use
of Phase Discrimination
1) Ensure product is flowing through the detector,
creating worst case product effect condition”.
2) Enter the access code.
3) Select appropriate product number (00 to 20).
4) Manually set phase to 0000, (NB product No 00 is
preset to phase 0000 and cannot be altered).
5) Observe the bar graph display and adjust the
sensitivity such that the product gives a maximum
signal of 2 to 3 green segments on the bar graph
display.
6) Test the detection sensitivity with metal samples.
Minimising Product Effect Signal By Manually
Adjusting The Phase Discriminator.
The objective of the following procedure is to
ascertain the setting of phase which will align the
phase discriminator with the product signal. The
correct setting will give minimum signal from the
product on the bar graph display.
There will be one value of phase which will give
minimum signal, this is known as the null point
PHASE VALUE
setting. Changing the phase setting up or down in
value from this setting will increase the amplitude of
the signal.
it is much easier to find the correct phase setting by
starting at a low sensitivity setting then repeating the
process in stages at increased sensitivity.
When using phase discrimination to minimise product
signals the detector will become more susceptible to
vibration. The final setting of sensitivity may be limited
by vibration effects rather than product effect.
1) Ensure product is flowing through the detector
creating worst case product effect conditions.
Vibration
Ferrous
Product Signal
Stainless
0000
3000
0000
Ferrou
s
Non -
Steels
Summary of Contents for STANDARD SERIES
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