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
YouTube video

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
LOAD CELL SIMULATION IN PROTEUS USING ARDUINO AND INA122 (INSTRUMENTATION AMPLIFIER)

ADVANCED TRAFFIC CONTROL AND RESCUE SYSTEM

ARDUINO AND SERVO MOTOR INTERFACING SIMULATION IN PROTEUS