Fault Monitor and Alarm for Multiple Load Cell Installations

Fault Monitor and Alarm for Multiple Load Cell Installations from Aptifirst

By: Aptifirst  07/12/2013
Keywords: control equipment, Industrial Process Control Equipment, weight control

Many weighing installations are based around multiple load cells, eg a silo or feeder may be mounted on three or four load cells, and it is usual to common the outputs of these load cells to provide a total weight or force signal to a display or control system. However, should one of the load cells in the system develop a fault, an error in the measured weight may occur which may not be immediately apparent. The new LCI unit supplied by Aptifirst Ltd is designed to overcome this problem. The LCI Load Cell Failure Alarm provides a connection between 1 to 4 load cells and a weighing system, and constantly monitors the condition of individual load cells. Continuous diagnosis of fault conditions prevents the incorrect weighing of product and the subsequent technical and commercial problems resulting from such situations. The LCI reports any load cell malfunction immediately by setting an alarm condition output, avoiding incorrect material levels so that there is the continued assurance of correct product quantities. The avoidance of batch wastage or product recall, reduction in plant downtime and increased safety, together with aids for installation and commissioning; all contribute to the LCI becoming an essential element for all weighing systems. The LCI unit will detect the following faults: * Load Cell out of preset balance range * Load Cell out of pre-set operating range * Low or high excitation voltage * Open circuit to any load cell on each connection * Short circuit on any load cell connection * Internal load cell fault (Bridge Imbalance) Aptifirst offers a range of related instrumentation and sensors for weighing and force measurement applications, amongst many others, as well as materials testing machines, a consultancy and advice service, and the design and manufacture of bespoke machines for special applications.

Keywords: Condition monitoring, control equipment, Fault detection, Industrial Process Control Equipment, Load Cell, weighing, weight control

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