current transducer 4-20 mA

Other Hardware Sensors
1

Hello,

I'm sorry, my English is poor.

I have a problem. I am trying to mesaure a current with this sensor but I don't do the mesaure well.

Well, I try to experiments.

  • I measured power supply AC. It's 24W power. I measured with polimeter 2V on input I07 arduino PLC, I thought that sensor current has an offset voltaje and I should do a new experiment.

-I did a second experiment. The diference was the power. I wanted to measure a COOL/HOT pump in my office, that power is 2000/3000W more or less. When I did the measure, I measured 2.06V on inpur I07 arduino PLC.

I don´t understand where the problem are.

I think I might sensor current are broken or I have a reference problem.

I use this code for the measure.

const int I07=A0; //Analog IN
const int I07=A0; //Analog IN


//this part of code is into another function
for(int i=0; i<=9; i++){
    value11= analogRead(I07);
    value22= maped(value11,0,1023,0.0,10.0);
    float intensidad2 = 6.25*value22-12.5;
    intensidad = intensidad_ant+intensidad2;
    intensidad_ant= intensidad;
  }
  intensidad_ant=0;
  
  intensidad = intensidad/10;
  powerR=230*intensidad;
  powerR= powerR/1000;
  intensidad =0;


//maped function

float maped(float x, float in_min, float in_max, float out_min, float out_max){
  
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

I have sorted out this problem for two days but I don't find out the solution.

Best regards

PD: datasheet of arduino PLC is too size. I put here the URL
https://www.industrialshields.com/wp-content/uploads/2016/02/23.03.16_M-duino21-42-58-1.pdf

0900766b8142e820(1).pdf (617 KB)

SCHEMATIC.pdf (87.3 KB)

2

Did you put the entire 3 (Live, Neutral, Earth) wire cable into the current transducer?
If so then you will measure close to zero amps as the forward and reverse magnetic fields will cancel.

3

Which AT ?? B420L do you have?

4

mikb55:
Did you put the entire 3 (Live, Neutral, Earth) wire cable into the current transducer?
If so then you will measure close to zero amps as the forward and reverse magnetic fields will cancel.

I only put Live wire cable into de current transducer.

5

edgemoron:
Which AT ?? B420L do you have?

I have AT 50 B420L

6

Try this hookup and test sketch:
out2.png

float amps, volts;
const float aRef = 5.0; // measured with DMM
const int res = 220;    // measured with DMM
const byte aIn = 0; // analog input pin

void setup()
{
  Serial.begin(9600);
   
}

void loop()
{
  volts = analogRead(aIn) * aRef / 1024;
  // 4 mA = 0.88V
  // 50 amps / 16 mA = 0.32 mA per amp = 14.2 amps  per volt
  amps = (volts - 0.88) * 14.2;
  Serial.println(amps,1);
  delay(500);
}

out2.png