Analog Vs. Digital Weighing Systems

By Duane Cappo

When sizing up a weighing application there are many options to choose from. With modern technology and the advancements in A/D converter technology the performance of a typical weighing system is surprisingly good. With so many choices out there, how do you narrow it down?

There are basically two technologies, the more common “Strain Gage” technology and the “Electro Magnetic Force Compensation” system. Both have their place in the weighing industry and sometimes it is a tough call to decide which way to go.

For most applications the strain gage is the obvious choice because of the lower cost, simple design and ease of maintenance. Strain gage load cells are usually held with a few screws so removal and replacement is quite simple. For tank or process weighing systems the strain gage load cells are often contained in “mounting kits” that allow them to move slightly and reduce the unwanted output caused by side forces. Most applications will use either flexible mounting kits or rigidly mounted load cells.