EC module calibration confusion
o.whinnett.uk 2017-02-07 09:13:06 3474 Views3 Replies I bought the EC module kit but I am confused about how to alter the code. I understand you get two points using calibration solutions at EC=1.413 and EC=2.76 giving you two corresponding voltages so you have (x1, y1) = (V1, 1.413) and (x2, y2) = (V2, 2.76) which allows you to plot a straight line and get an equation y = mx+c. My question is this - if you work out an equation such as y = 0.006568419x + 0.04311972 how would you alter the below code to successfully calibrate the meter? Can you alter the code for me using this example equation so I understand where to plug in the values?
[code] if(CoefficientVolatge<=448)ECcurrent=6.84*CoefficientVolatge-64.32; //1ms/cm<EC<=3ms/cm
else if(CoefficientVolatge<=1457)ECcurrent=6.98*CoefficientVolatge-127; //3ms/cm<EC<=10ms/cm
else ECcurrent=5.3*CoefficientVolatge+2278; //10ms/cm<EC<20ms/cm[/code]
Also do you need to have the two calibration solutions at 25°C Isn't it temperature compensated?
[code] if(CoefficientVolatge<=448)ECcurrent=6.84*CoefficientVolatge-64.32; //1ms/cm<EC<=3ms/cm
else if(CoefficientVolatge<=1457)ECcurrent=6.98*CoefficientVolatge-127; //3ms/cm<EC<=10ms/cm
else ECcurrent=5.3*CoefficientVolatge+2278; //10ms/cm<EC<20ms/cm[/code]
Also do you need to have the two calibration solutions at 25°C Isn't it temperature compensated?
2017-02-09 23:00:33 Hi
There is another method to calibrate the module below the Scheme of Calibration, refer to the following picture, you can calibrate the module only by the code, which is easier.
[attachment=0]QQ图片20170209143142.png[/attachment]
As for the old method, for example, 0.006568419*1000=6.56 to exchange 6.84, 0.04311972*1000=43.11 to exchange 64.32. if there is only one equation, just this code will be ok: ECcurrent=6.56 *CoefficientVolatge-43.11;
And the temperature is just a a environmental requirements, not a temperature compensated.
Hope this will help you.
Wendy.Hu
There is another method to calibrate the module below the Scheme of Calibration, refer to the following picture, you can calibrate the module only by the code, which is easier.
[attachment=0]QQ图片20170209143142.png[/attachment]
As for the old method, for example, 0.006568419*1000=6.56 to exchange 6.84, 0.04311972*1000=43.11 to exchange 64.32. if there is only one equation, just this code will be ok: ECcurrent=6.56 *CoefficientVolatge-43.11;
And the temperature is just a a environmental requirements, not a temperature compensated.
Hope this will help you.
Wendy.Hu 