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.
Yes, load cells are generally very linear; you can expect weight to map linearly to resistance within the cell's operating envelope.
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.