Page 85 - Flipbook_SolidDesignSoutheast2020

Model403Series of Weigh Feeders

Standard Design Features

• Continuous metering or batch weighing on a • Acri-Lok ® — All Acrison “weight-loss” weigh feeders
“weight-loss” basis — Acrison’s “weight-loss” opera- include a unique operational feature… Acri-Lok…
tional concepts and equipment designs combine rugged- developed and patented by Acrison to ensure accurate
duty, permanently calibrated, adjustment-free state-of- metering whenever the weighing system is disturbed in
the-art weighing systems with the most versatile dry any manner that would otherwise affect the accuracy of
solids metering/handling mechanisms and related controls the metered output.
to provide users with an unsurpassed level of highly reli- ®
able overall performance. • Batch-Lok — In addition to Acri-Lok, should an
abnormal disturbance be detected by the weighing
• Accuracy — All Acrison continuous weigh feeders typi- system of an Acrison “weight-loss” weigh feeder oper-
cally provide metering accuracies ranging between ± ating in a batching mode, a supplementary feature…
0.25 to 1 percent or better (error), at two sigma, based on Batch-Lok… is provided to ensure the highest possible
a given number of consecutive one minute weighments. degree of batch accuracy.
Batch accuracies typically range between ± 0.1 to 0.5 • Automatic refilling — All Acrison “weight-loss” weigh
percent or better (error), at two sigma, based on a given feeder control systems provide for the automatic refilling
number of repetitive consecutive weighments.
of the feeder’s integral supply hopper (or tank). When
• No response lag — Acrison’s various positive-flow automatically refilled, the controller initiates a refill com-
metering mechanisms respond instantaneously upon mand upon sensing low hopper (or tank) level, provided
command from the controller to alter the feed output. the feed rate output is within pre-established tolerances.
Absolutely no lag exists since product discharge is During the refill period, the feeding mechanism operates
directly out of the scale-mounted metering device. in a volumetric control mode, returning to gravimetric
control after refill and when the controller senses a nor-
• Feed range — As standard, all Acrison “weight-loss” weigh mal “weight-loss” condition.
feeders are capable of an overall feed range of 100:1.
Although refill is generally rapid, Acrison “weight-loss”
• Feed output capacity — Depending upon the model controllers include a number of very effective opera-
and size, the overall feed rate output capability for the tional features specifically designed to ensure optimum
various model “weight-loss” weigh feeders described in metering accuracy during all phases of refill, when the
this Bulletin ranges from several pounds up to approxi- feeder is not in gravimetric control.
mately 200,000 pounds per hour.
• Unaffected by typical in-plant vibration and dust —
• Weighing System — Acrison’s various patented weigh- Typical in-plant vibrations do not affect Acrison weigh
ing mechanisms are, by far, the most reliable, sensitive feeders, as proven in scores of worldwide installations.
and accurate in the industry.The novel lever mechanisms The novel overall mechanical design of Acrison’s various
of these frictionless, ultra-high resolution counterbal- weighing mechanisms inherently provides excellent
anced “weight-loss” weighing systems have been resistance to in-plant vibrations without the need to
ruggedly designed for tough industrial weigh feeding integrate the actual weight signal for stability purposes.
applications. They are designed with an uncommonly Also, based on the “weight-loss” principle of operation,
high service factor easily capable of withstanding the dust accumulation onto any part of the weigh feeder will
continual “impacts” associated with refilling without any not present any operational problems whatsoever.
adverse consequences.
• Ambient operating temperature range — All Acrison
Also, once calibrated (factory completed) these unique
weighing systems do not require any type of mechanical weigh feeders will operate within an ambient temperature
re-calibration or adjustment; in fact, such provisions do range of –10 to 140 degrees Fahrenheit without any
not exist. They are permanently calibrated. affect on performance.
• Totally enclosed product zone — Because of the com-
• Ratiometric Digital Weight Resolver (RDWR) —
Acrison’s Ratiometric Digital Weight System utilizes syn- pletely enclosed design of all Acrison “weight-loss” weigh
chro-resolver technology and innovative electronics to feeders, product remains totally confined, thus assuring a
produce a digital weight signal having extraordinary dust-tight and clean operation.
performance specifications. This unamplified, non-inte- • Minimum of moving parts — All Acrison “weight-loss”
grated, highly precise and stable weight signal is a count weigh feeders have been designed with a minimum num-
ranging from 0 to 1,048,576 (20 bits), capable of use by ber of moving parts to ensure the highest possible
any of Acrison’s multiprocessor weigh feeder controllers. degree of dependability and longevity, with lowest main-
Please see pages 5 and 6 for additional information. tenance requirements.
• No rezeroing — Acrison’s “weight-loss” principle of oper- • Silent operation — All Acrison weigh feeders are virtually
ation does not require a zero reference point; thus, the silent when operating.
need for rezeroing the weighing system is never required.

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