LOAD CELL AMPLIFIER

INSTRUMENTATION AMPLIFIER INA 122

LOW OFFSET VOLTAGE: 250µV max
SUPPLY RANGE  --Single Supply: 2.2V to 36V, Dual Supply: –0.9/+1.3V to ±18V


 FIGURE 1- PINOUT



  FIGURE 2- GAIN EQUATION & GAIN TABLE


 FIGURE 3- BASIC CIRCUIT

SAMPLE APPLICATION  -INA122 AS LOAD CELL CZL601
AMPLIFIER


FIGURE 5 - LOAD CELL AMPLIFIER USING SINGLE SUPPLY

GAIN RESISTOR DESIGN
Since input signal is in the range of uV range we need maximum gain.there is problem of non linearity at higher gain . I recommends two amplifiers for this purpose .The gain is selected above 40000. ie i have set the pot nearer to minimum position .ie near to 5 ohms.  







LOAD CELL CZL601



EQUIVALENT CIRCUIT OF LOAD CELL