Product category:
Materials testing equipment
News Release from: Procon Engineering | Subject: Force calibration system
Edited by the Engineeringtalk Editorial
Team on 07 March 2003
Force calibration system gains ATEX
option
Procon Engineering's highly successful force calibration system for calibrating weighing vessels, silos and hoppers is now available in an ATEX certified, battery operated version.
Procon Engineering's highly successful force calibration system for calibrating weighing vessels, silos and hoppers is now available in an ATEX certified, battery operated version for use in zone 1 hazardous areas Ensuring that weighing systems continue to meet required performance criteria is vital to many processes and commercial transactions
This article was originally published on Engineeringtalk on 7 Oct 2005 at 8.00am (UK)
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This can only be achieved if regular and effective calibration is carried out to exacting and traceable standards.
Although there are a number of well recognised calibration methods, often their practical application in a particular installation may be restricted, especially once the system has been installed and commissioned.
As Rod Massey, Procon's Service Manager explains: "Although as a company we offer a range of calibration methods, selected to meet specific customer requirements, where practical, we prefer to use our force calibration system.
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Methods involving standard test weights or flow meters provide good accuracy but in many applications they cannot be applied without major disruption to the plant.
Often it is not possible to apply large quantities of test weights and when flow meters are used there is the high cost of disposing of, or reprocessing, large volumes of contaminated water.
In addition, both methods require the vessel to be empty when calibration takes place, resulting in precious plant downtime.
By comparison our force calibration method can be used whatever the weight in the vessel.
This is of great importance if vital components such as load cells or instrumentation need replacing necessitating the need to recalibrate the system.
In such cases, this can be carried out without the need to empty the vessel.
Now this system is approved for use in hazardous areas, we can deal with every eventuality".
The system works by placing specially calibrated load cells and force generators (typically hydraulic jacks) in parallel with the load cells supporting the vessel by means of special mounting brackets designed into the structure.
By applying load to the calibration load cells through the force generators, the weighing system output can be compared with that of the Force Calibration system at typically 10 points over the weighing range.
This method provides a high accuracy, non-intrusive and expedient method of calibrating weighing systems.
The load cells are traceable to NAMAS standards and give a calibration accuracy of +/- 0.01%.
This means that where applicable, in line with ISO9000 recommendations for calibration, systems can be certified to +/-0.03% (three times the calibration accuracy).
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