Analog Circuits, Hardware, Topic

LOAD CELL AMPLIFIER

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By Jackson Taylor

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
FIGURE 1- PINOUT
Figure 2
FIGURE 2- GAIN EQUATION & GAIN TABLE
Figure 3
FIGURE 3- BASIC CIRCUIT

SAMPLE APPLICATION  -INA122 AS LOAD CELL CZL601 AMPLIFIER

Figure 5
FIGURE 5 – LOAD CELL AMPLIFIER USING SINGLE SUPPLY
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GAIN RESISTOR DESIGN

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 Image 1 Load Cell Image 2
LOAD CELL CZL601
Equivalent Circuit
EQUIVALENT CIRCUIT OF LOAD CELL
See also
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