I have been using four half bridge load-sensors. After forming a bridge, the output of the bridge is fed into ADC(ADS1230). I'm using this load-cell. From the output of the ADC, I want to convert it into KGs simply by 'Slope-method', assuming the output of ADC to be linear. I only have to be confirmed that the load-cell behaves linearly or not when the huge weight is subjected to it.
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\$\begingroup\$ The datasheet for your load cell should give you a linearity spec. I can't remember when I last saw one which was any worse than 100ths or 1000ths of 1% though, so I doubt you'll need to worry. \$\endgroup\$– brhansCommented Jun 22, 2015 at 16:57
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2 Answers
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Yes, load cells are generally very linear; you can expect weight to map linearly to resistance within the cell's operating envelope.
answered Jun 22, 2015 at 13:32
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the linearity is typically 0.2% over 0 to max rated load. Decide the ADC resolution based on ratio of full scale to short term stability. This means a 11 or 12 bit load sesnor. If you have a more resolution from the ADC replace the last few bits with 0. A high accuracy ADc when used with a low accuracy load sensor yields a low accuracy answer for load. And load sensors requiring 0.01% (13 bit) ADC are not made as one would hardly require it.
