Page 108 - Flipbook_SolidDesignSoutheast2020

Standard Design Features

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• Continuous or batch weighing on a ‘weight-loss’ basis – • Acri-Lok – All Acrison ‘weight-loss’ weigh feeders in-
Acrison’s ‘weight-loss’ operational concepts and equip- clude a unique operational feature... Acri-Lok... developed
ment designs combine advanced weighing technologies and patented by Acrison to ensure accurate metering
with the most versatile dry solids metering/handling whenever the weighing system is disturbed in any manner
mechanisms and related controls to provide users with an that would otherwise adversely affect the accuracy of the
unsurpassed level of overall performance. metered output.
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• Accuracy – All Acrison continuous weigh feeders typi- • Batch-Lok – In addition to Acri-Lok, should an abnor-
cally provide metering accuracies ranging between ± mal disturbance be detected by the weighing system of
0.25 to 1 percent or better (error), at two sigma, based an Acrison ‘weight-loss’ weigh feeder operating in a
on a given number of consecutive one minute weigh- batching mode, a supplementary feature... Batch-Lok...
ments. Batch accuracies typically range between ± 0.1 to is provided to ensure the highest possible degree of
0.5 percent or better (error), at two sigma, based on a batch accuracy.
given number of consecutive weighments.
• Automatic refilling – All Acrison ‘weight-loss’ weigh
• No response lag – Acrison’s various metering mecha- feeder control systems provide for automatic refilling of
nisms respond instantaneously upon command from the feeder’s integral supply hopper (or tank). When auto-
the controller to alter the feed output. Absolutely no lag matically refilled, the controller initiates a refill command
exists since product discharges directly out of the scale- upon sensing low hopper (or tank) level, once the feed
mounted metering device. rate output is within pre-established tolerances.
• Feed range – As standard, all Acrison ‘weight-loss’ weigh During the refill period, the feeding mechanism operates
feeders are capable of an overall feed range of 100:1 in a volumetric mode, returning to gravimetric control
after refill and when the controller senses a normal
• Feed output capacity – Depending upon the model and ‘weight-loss’ condition. In addition, Acrison ‘weight-loss’
size, the overall feed rate output capability for Acrison’s controllers include a number of very effective operational
various model ‘weight-loss’ weigh feeders described in features specifically designed to ensure optimum meter-
this Bulletin ranges from less than one pound up to ing accuracy during all phases of refill, when the feeder
approximately 20,000 pounds per hour. is not in gravimetric control.
• Weighing System – Acrison’s various weighing systems • Unaffected by typical in-plant vibration and dust –
are the most durable, reliable, and accurate in the indus- Typical in-plant vibrations do not affect Acrison weigh
try. The technologically advanced lever mechanisms of feeders, as proven in scores of installations. The novel
these frictionless, ultra-high resolution counterbalanced mechanical design of Acrison weighing mechanisms in-
weighing systems have been specifically designed for herently provides excellent resistance to in-plant vibra-
tough industrial ‘weight-loss’ weigh feeding applica- tions without the need to integrate the actual weight
tions. They are also designed with an uncommonly high signal for stability purposes. Also, based on the ‘weight-
service factor easily capable of withstanding the con- loss’ principle of operation, dust accumulation onto
tinual ‘impacts’ associated with refilling without any any part of the weigh feeder will not adversely affect
adverse consequences. metering performance.
Also, once calibrated (factory completed), these weigh- Ambient operating temperature range – All Acrison
ing systems do not require any type of mechanical re- • weigh feeders will operate within an ambient tempera-
calibration or adjustment. In fact, such provisions do not ture range of -20 to 150 degrees Fahrenheit without any
exist, they are permanently calibrated.
affect on performance.
• Ratiometric Digital Weight Resolver (RDWR) – Acrison’s • Totally enclosed product zone – Because of the com-
Ratiometric Digital Weight Sensing 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
produce a digital weight signal having extraordinary a clean dust-tight operation.
performance specifications. This unamplified, non-inte-
grated, highly precise and stable weight signal is a count • Minimum of moving parts – All Acrison ‘weight-loss’
ranging from 0 to 1,048,576 (20 bits), capable of use by weigh feeders have been designed with a minimum
any of Acrison’s multiprocessor weigh feeder controllers. number of moving parts to ensure the highest possible
Please see page 5 for additional information. degree of reliability with lowest possible maintenance
requirements. Longevity is exceptional.
• No rezeroing – Acrison’s ‘weight-loss’ principle of oper-
ation does not require a ‘scale’ zero reference point; • Silent operation – All Acrison weigh feeders are virtually
thus, rezeroing the weighing system is never required. silent when operating.

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