Mass Measurement


Loadtech has the answer

March 2011 Mass Measurement

Loadtech says it has combined experience in the design and manufacture of load cells and force transducers of more than 50 years. Thousands of load cells have been built and supplied throughout the industry since the registration of the company in 1987 and its track record of customer service and quality is well established.

The company has been exposed to a wide variety of designs and applications over the years and has worked with its customers to ensure the successful implementation of all of them. It says the benefit to customers is the availability, knowledge and experience in the planning and implementation stages of systems. In short, getting the job right first time and ensuring payback from day one. It can offer a wide range of standard cells to suit most applications and, where required, we will design and build a product specifically to suit an application.

Solution development

First, the operating environment must be defined. What is the total load and how is it distributed? Is the installation outdoors or indoors? Is it an explosive area or does it pose other safety hazards? Is the movement of the load restricted and is it static or dynamic in nature?

Second, the required accuracy must be established. In most cases only a part of the operating range of the load sensor will be used with the lower part of the range being taken up by the empty (tare) weight of the system. Tare weights are anything from 5-50% of the load sensors capacity. Allowance must also be made for unexpected overload conditions, so that the sensors are not damaged unnecessarily when a fault occurs in the plant or plant control system. This leaves an operating range of anything between 30 and 70% of the full sensor range. A large tare weight will have a significant effect on the accuracy that can be achieved, meaning that in some cases where small quantities of an expensive component are added to a batch, a secondary smaller batching system will need to run in parallel with the main system to ensure the correct weight additive. Cement being added to a batch of concrete is a good example of this.

A good understanding of load sensor specifications is needed to ensure that the correct model and accuracy class has been selected for the job. The company invites clients to contact them before tackling the next weighing project.

For more information contact John Harrison, Loadtech, +27 (0)12 661 0830, sales@loadtech.co.za, www.loadtech.co.za


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