<s>
A	O
checkweigher	B-Algorithm
is	O
an	O
automatic	O
or	O
manual	O
machine	O
for	O
checking	O
the	O
weight	O
of	O
packaged	O
commodities	O
.	O
</s>
<s>
Any	O
packs	B-Algorithm
that	O
are	O
outside	O
the	O
tolerance	O
are	O
taken	O
out	O
of	O
line	O
automatically	O
.	O
</s>
<s>
A	O
checkweigher	B-Algorithm
can	O
weigh	O
in	O
excess	O
of	O
500	O
items	O
per	O
minute	O
(	O
depending	O
on	O
carton	O
size	O
and	O
accuracy	O
requirements	O
)	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
can	O
be	O
used	O
with	O
metal	O
detectors	O
and	O
X-ray	O
machines	O
to	O
enable	O
other	O
attributes	O
of	O
the	O
pack	O
to	O
be	O
checked	O
and	O
acted	O
upon	O
accordingly	O
.	O
</s>
<s>
An	O
automatic	O
checkweigher	B-Algorithm
incorporates	O
a	O
series	O
of	O
conveyor	O
belts	O
.	O
</s>
<s>
In	O
filler	O
applications	O
,	O
they	O
are	O
known	O
as	O
check	B-Algorithm
scales	I-Algorithm
.	O
</s>
<s>
This	O
is	O
typically	O
mounted	O
on	O
a	O
weight	O
transducer	O
which	O
can	O
typically	O
be	O
a	O
strain-gauge	O
load	B-Algorithm
cell	I-Algorithm
or	O
a	O
servo-balance	O
(	O
also	O
known	O
as	O
a	O
force-balance	O
)	O
,	O
or	O
sometimes	O
known	O
as	O
a	O
split-beam	O
.	O
</s>
<s>
For	O
high-speed	O
precision	O
scales	O
,	O
a	O
load	B-Algorithm
cell	I-Algorithm
using	O
electromagnetic	O
force	O
restoration	O
(	O
EMFR	O
)	O
is	O
appropriate	O
.	O
</s>
<s>
Other	O
technologies	O
used	O
include	O
strain	O
gauges	O
and	O
vibrating	O
wire	O
load	B-Algorithm
cells	I-Algorithm
.	O
</s>
<s>
Torque	O
on	O
a	O
load	B-Algorithm
cell	I-Algorithm
causes	O
erratic	O
readings	O
.	O
</s>
<s>
A	O
dynamic	O
,	O
in-motion	O
checkweigher	B-Algorithm
takes	O
samples	O
,	O
and	O
analyzes	O
them	O
to	O
form	O
an	O
accurate	O
weight	O
over	O
a	O
given	O
time	O
period	O
.	O
</s>
<s>
A	O
typical	O
checkweigher	B-Algorithm
usually	O
has	O
a	O
bin	O
to	O
collect	O
the	O
out-of-tolerance	O
packs	B-Algorithm
.	O
</s>
<s>
There	O
is	O
also	O
a	O
requirement	O
under	O
the	O
European	O
Average	O
Weight	O
System	O
that	O
data	O
collected	O
by	O
checkweighers	B-Algorithm
is	O
archived	O
and	O
is	O
available	O
for	O
inspection	O
.	O
</s>
<s>
Most	O
modern	O
checkweighers	B-Algorithm
are	O
therefore	O
equipped	O
with	O
communications	O
ports	O
to	O
enable	O
the	O
actual	O
pack	O
weights	O
and	O
derived	O
data	O
to	O
be	O
uploaded	O
to	O
a	O
host	O
computer	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
that	O
are	O
equipped	O
with	O
high	O
speed	O
communications	O
such	O
as	O
Ethernet	O
ports	O
are	O
capable	O
of	O
integrating	O
themselves	O
into	O
groups	O
such	O
that	O
a	O
group	O
of	O
production	O
lines	O
that	O
are	O
producing	O
identical	O
products	O
can	O
be	O
considered	O
as	O
one	O
production	O
line	O
for	O
the	O
purposes	O
of	O
weight	O
control	O
.	O
</s>
<s>
An	O
alternative	O
is	O
to	O
program	O
the	O
checkweigher	B-Algorithm
to	O
check	O
bands	O
of	O
different	O
weight	O
tolerances	O
.	O
</s>
<s>
This	O
means	O
that	O
the	O
product	O
can	O
weigh	O
85	O
g	O
to	O
115	O
g	O
.	O
However	O
,	O
if	O
10,000	O
packs	B-Algorithm
a	O
day	O
are	O
being	O
produced	O
,	O
and	O
most	O
are	O
110	O
g	O
,	O
100kg	O
of	O
product	O
is	O
being	O
lost	O
.	O
</s>
<s>
Example	O
:	O
A	O
checkweigher	B-Algorithm
is	O
programmed	O
to	O
indicate	O
5	O
zones	O
with	O
resolution	O
to	O
1	O
g	O
:	O
</s>
<s>
With	O
a	O
check	B-Algorithm
weigher	I-Algorithm
programmed	O
as	O
a	O
zone	O
checkweigher	B-Algorithm
,	O
the	O
data	O
collection	O
over	O
the	O
networks	O
,	O
as	O
well	O
as	O
local	O
statistics	O
,	O
can	O
indicate	O
the	O
need	O
to	O
check	O
the	O
settings	O
on	O
the	O
upstream	O
equipment	O
to	O
better	O
control	O
flow	O
into	O
the	O
packaging	B-Algorithm
.	O
</s>
<s>
In	O
many	O
cases	O
a	O
checkweigher	B-Algorithm
has	O
a	O
light-tree	O
with	O
different	O
lights	O
to	O
indicate	O
the	O
variation	O
of	O
the	O
zone	O
weight	O
of	O
each	O
product	O
.	O
</s>
<s>
This	O
data	O
can	O
be	O
used	O
to	O
determine	O
if	O
an	O
issue	O
exists	O
with	O
an	O
upstream	O
filling	O
,	O
or	O
packaging	B-Algorithm
,	O
machine	O
.	O
</s>
<s>
A	O
checkweigher	B-Algorithm
can	O
send	O
a	O
signal	O
to	O
the	O
machine	O
to	O
increase	O
or	O
decrease	O
the	O
amount	O
put	O
into	O
a	O
package	O
.	O
</s>
<s>
This	O
can	O
result	O
in	O
a	O
payback	O
associated	O
with	O
the	O
checkweigher	B-Algorithm
since	O
producers	O
will	O
be	O
better	O
able	O
to	O
control	O
the	O
amount	O
of	O
give-away	O
.	O
</s>
<s>
See	O
outlining	O
ground	O
beef	O
and	O
packaging	B-Algorithm
savings	O
.	O
</s>
<s>
Speed	O
and	O
accuracy	O
that	O
can	O
be	O
achieved	O
by	O
a	O
checkweigher	B-Algorithm
is	O
influenced	O
by	O
the	O
following	O
:	O
</s>
<s>
An	O
in	O
motion	O
conveyor	O
checkweigher	B-Algorithm
can	O
be	O
used	O
to	O
detect	O
missing	O
pieces	O
of	O
a	O
kit	O
,	O
such	O
as	O
a	O
cell	O
phone	O
package	O
that	O
is	O
missing	O
the	O
manual	O
,	O
or	O
other	O
collateral	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
are	O
typically	O
used	O
on	O
the	O
incoming	O
conveyor	O
chain	O
,	O
and	O
the	O
output	O
pre-packaging	O
conveyor	O
chain	O
in	O
a	O
poultry	O
processing	O
plant	O
.	O
</s>
<s>
A	O
high	O
speed	O
conveyor	O
scale	O
can	O
be	O
used	O
to	O
change	O
the	O
pacing	O
,	O
or	O
pitch	O
of	O
the	O
products	O
on	O
the	O
line	O
by	O
speeding	O
,	O
or	O
slowing	O
the	O
product	O
speed	O
to	O
change	O
the	O
distance	O
between	O
packs	B-Algorithm
before	O
reaching	O
a	O
different	O
speed	O
going	O
into	O
a	O
conveyor	O
machine	O
that	O
is	O
boxing	O
multiple	O
packs	B-Algorithm
into	O
a	O
box	O
.	O
</s>
<s>
A	O
checkweigher	B-Algorithm
can	O
be	O
used	O
to	O
count	O
packs	B-Algorithm
,	O
and	O
the	O
aggregate	O
(	O
total	O
)	O
weight	O
of	O
the	O
boxes	O
going	O
onto	O
a	O
pallet	O
for	O
shipment	O
,	O
including	O
the	O
ability	O
to	O
read	O
each	O
package	O
's	O
weight	O
and	O
cubic	O
dimensions	O
.	O
</s>
<s>
A	O
receiving	O
checkweigher	B-Algorithm
for	O
the	O
shipment	O
can	O
read	O
the	O
label	O
with	O
a	O
bar	O
code	O
scanner	O
,	O
and	O
determine	O
if	O
the	O
shipment	O
is	O
as	O
it	O
was	O
before	O
the	O
transportation	O
carrier	O
received	O
it	O
from	O
the	O
shipper	O
's	O
loading	O
dock	O
,	O
and	O
determine	O
if	O
a	O
box	O
is	O
missing	O
,	O
or	O
something	O
was	O
pilfered	O
or	O
broken	O
in	O
transit	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
are	O
also	O
used	O
for	O
Quality	O
management	O
.	O
</s>
<s>
Quality	O
management	O
can	O
use	O
a	O
checkweigher	B-Algorithm
for	O
Nondestructive	O
testing	O
to	O
verify	O
finished	O
goods	O
using	O
common	O
Evaluation	O
methods	O
to	O
detect	O
pieces	O
missing	O
from	O
a	O
"	O
finished	O
"	O
product	O
,	O
such	O
as	O
grease	O
from	O
a	O
bearing	O
,	O
or	O
a	O
missing	O
roller	O
within	O
the	O
housing	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
can	O
be	O
built	O
with	O
metal	O
detectors	O
,	O
x-ray	O
machines	O
,	O
open-flap	O
detection	O
,	O
bar-code	O
scanners	O
,	O
holographic	O
scanners	O
,	O
temperature	O
sensors	O
,	O
vision	O
inspectors	O
,	O
timing	O
screws	O
to	O
set	O
the	O
timing	O
and	O
spacing	O
between	O
product	O
,	O
indexing	O
gates	O
and	O
concentrator	O
ducts	O
to	O
line	O
up	O
the	O
product	O
into	O
a	O
designated	O
area	O
on	O
the	O
conveyor	O
.	O
</s>
<s>
An	O
industrial	O
motion	O
checkweigher	B-Algorithm
can	O
sort	O
products	O
from	O
a	O
fraction	O
of	O
a	O
gram	O
to	O
many	O
,	O
many	O
kilograms	O
.	O
</s>
<s>
Specialized	O
checkweighers	B-Algorithm
can	O
weigh	O
commercial	O
aircraft	O
,	O
and	O
even	O
find	O
their	O
center-of-gravity	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
can	O
operate	O
at	O
very	O
high	O
speeds	O
,	O
processing	O
products	O
weighing	O
fractions	O
of	O
a	O
gram	O
at	O
over	O
100m/m	O
(	O
meters	O
per	O
minute	O
)	O
and	O
materials	O
such	O
as	O
pharmaceuticals	O
and	O
200lb	O
bags	O
of	O
produce	O
at	O
over	O
100fpm	O
(	O
feet	O
per	O
minute	O
)	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
are	O
used	O
in	O
cleanrooms	O
,	O
mints	O
(	O
rolls	O
of	O
coins	O
)	O
,	O
dry	O
atmosphere	O
environments	O
,	O
wet	O
environments	O
,	O
produce	O
barns	O
,	O
food	O
processing	O
,	O
drug	O
processing	O
,	O
etc	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
are	O
specified	O
by	O
the	O
kind	O
of	O
environment	O
,	O
and	O
the	O
kind	O
of	O
cleaning	O
will	O
be	O
used	O
.	O
</s>
<s>
Typically	O
,	O
a	O
is	O
made	O
of	O
mild	O
steel	O
,	O
and	O
one	O
that	O
will	O
be	O
cleaned	O
with	O
harsh	O
chemicals	O
,	O
such	O
as	O
bleach	O
,	O
will	O
be	O
made	O
with	O
all	O
stainless	O
steel	O
parts	O
,	O
even	O
the	O
Load	B-Algorithm
cells	I-Algorithm
.	O
</s>
<s>
Checkweighers	B-Algorithm
are	O
operated	O
in	O
some	O
applications	O
for	O
extremely	O
long	O
periods	O
of	O
time	O
-	O
24/7	O
year	O
round	O
.	O
</s>
<s>
Checkweighers	B-Algorithm
operating	O
in	O
high	O
density	O
conveyor	O
lines	O
may	O
have	O
numerous	O
special	O
equipments	O
in	O
their	O
design	O
to	O
ensure	O
that	O
if	O
an	O
E-stop	O
occurs	O
,	O
all	O
power	O
going	O
to	O
all	O
motors	O
is	O
removed	O
until	O
the	O
E-stop	O
is	O
cleared	O
and	O
reset	O
.	O
</s>
