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Model 402 Gravity
Feed Metal Detector
System 402 is a drop-through metal
detection system which incorporates a reject gate
for powders, granules and other free-flowing solids.
This system features high
sensitivity, high throughput and is compact in size;
it comes in 2-1/2", 5" and 7-1/2" ID
tubes, and is also available in rectangular
configurations. Both the reject chute and frame are
stainless steel. The inspection chute going through
the metal detector is made from polypropylene, nylon
or UHMW, depending on the application. This system
is available as USDA approved as well as rated for
hazardous locations.
Goring Kerr gravity feed systems are
designed to minimize system space, and product waste
while insuring maximum sensitivity to all metals.
Offering a wide range of stock systems along with
custom designs we can supply a 402 system for any
application.
Benefits of 402 Gravity Feed
Systems
Technical Advantages
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Fast acting electronics
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Comprehensive self diagnostic
system
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Single reject confirmation
within +/- 2 ms
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Dual reject confirmation within
+/- 2 ms
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Automatic noise compensation
Options
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Reject confirmation
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Available in USDA Meat &
Poultry or Dairy
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Available USDA construction for
Dairy applications
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Hazardous location ( Class 2,
Division 1 & 2 )
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DSP Net automatic data
collection software for your PC
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Antistatic product tube
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Reject position sensors for PLC
monitoring
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Available automatic or manual
test retrieval system
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Available slide out rejects for
easy cleaning
Design Considerations
Free fall of product.
Three key factors are used to
determine whether a system will react in time to
reject the metal contamination:
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Distance between search head and
reject valve
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Response time of electronics and
air operated components
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Free fall of product
Item 1) On Goring Kerr's
standard systems this spacing is as great as
possible within the overall height.
Item 2) The electronics and
mechanical configuration have been designed to
respond as quick as possible
Item 3) The free fall height
is the only variable on the standard system and must
be within the specified dimension. If you can not do
this the only option is to increase the dimension in
item 1. This would then increase the overall
dimension of the system.
Testing Procedure
When testing a gravity feed system, it is
very important that the test sample travels at the
same speed as the product. In order to verify the
response time of the reject gate, metal must be
introduced at the same point where the product
starts it’s vertical fall. Allowances must be made
to retrieve the test sample, even if it fails to be
rejected. Low air pressure or sticky solenoids are
typical reasons for failing this test. Short air
lines, high speed solenoids with quick exhaust air
fittings, or increased distance between the metal
detector and the reject gate will improve response
time. The metal detectors fault system can be
extended to monitor the operation of the reject
gate. With this option, hall effect sensors mounted
on the reject air cylinder verify the response time
for every detection signal. Rejected product should
be periodically examined to verify that metal
contaminants are actually leaving the system. This
will build confidence in your metal detector while
isolating possible false rejects.
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