158 lines
4.4 KiB
Plaintext
158 lines
4.4 KiB
Plaintext
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Kalibrierung der zwei neuen EC Probes für NFT und Dutch Bucket 2024.
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Probe A: Die Längere
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Probe B: Die etwas kürzere
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Lösung laut https://www.researchgate.net/profile/Sameer-Sayyad-2/post/How-is-it-possible-to-convert-conductivity-of-NaCl-solution-in-uS-to-its-salinity-NaCl-concentration-in-ppm/attachment/5abdeaedb53d2f63c3c2e08c/AS%3A609786693443585%401522395885345/download/conductivity+vs+concentration+NaCl+25+degress.pdf
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3g NaCl auf 1L H2O sind 5690 uS/cm @ 25°C
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Also 7,5g auf 0,25L H2O
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Dann 50mL davon mit 450mL H2O auf 1L auffüllen.
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Einige Messwerte genommen, ohne dass die EC Sensoren in Flüssigkeit sind.
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time,tempReservoir,ECadcCalib,ECadc_A,ECadcAdjusted_A,ECadc_B,ECadcAdjusted_B
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1524060,14.73,6021.09,729.21,728.70,729.16,728.65
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1555158,14.69,6021.75,729.20,728.61,729.05,728.46
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1577247,14.63,6021.88,728.94,728.33,728.96,728.35
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1620362,14.56,6021.88,728.95,728.34,728.87,728.27
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minimum adc rawA= 728.87
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ca. 300mL dest. Wasser in 500mL Becherglas auf Magnetrührer
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Wasser temperiert auf 25°C und durchgehend temperatur gehalten
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Temperatursensor und DIY EC-Probe in Flüssigkeit platziert
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Magnetrührer auf langsamer Stufe (keine Strudelbildung)
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Messwert per Tastendruck erfasst (time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted)
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zeit
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temperatur d. flüssigkeit
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referenz adc wert (geschalteter fester widerstand statt probe)
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Roher ADC Messwert (Probe A)
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angepasster ADC Messwert (linear gemappt nach abweichung vom referenz adc wert, referenz adc wert vorher ermittelt und eingegeben in code) (Probe A)
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Roher ADC Messwert (Probe B)
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angepasster ADC Messwert (Probe B)
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manuell notiert und später der csv angefügt: "solutionAdded"
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Erster Messwert nur dest. Wasser.
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Weitere Messwerte jew. nach hinzufügen erst wenigen tropfen NaCl Lösung. Später mehr bis zu 10mL pro Messung.
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time,mL added
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4198000,0
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4296000,0.1
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4347000,0.2
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4393000,0.3
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4441000,0.4
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4481000,0.5
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4525000,0.6
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4567000,0.7
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4615000,0.8
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4654000,0.9
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4729000,1.0
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4768000,1.1
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4800000,1.2
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4832000,1.3
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4865000,1.4
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4899000,1.5
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4938000,1.6
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4984000,1.7
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5024000,1.8
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5065000,1.9
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5098000,2.0
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5204000,2.5
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5243000,3.0
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5283000,3.5
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5331000,4.0
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5378000,4.5
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5420000,5.0
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5482000,5.5
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5537000,6.1
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5683000,7.0
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5731000,8.0
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5819000,9.0
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5860000,10.0
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5907000,11
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5938000,12
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5968000,13
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6068000,14
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6113000,15
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6151000,16
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6227000,17
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6282000,18
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6332000,19
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6380000,20
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6465000,25
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6528000,30
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6654000,35
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6743000,40
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6837000,45
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6886000,50
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6952000,60
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6999000,70
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7051000,80
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7098000,90
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7138000,100
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7270000,120
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7328000,140
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7392000,160
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7449000,180
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7505000,200
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Werte in 20240423_EC_Calibration_Raw.txt
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Zusammengeführt in 20240423_EC_Calibration.csv
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Auswertung in 20240423_EC_Calibration_with_graph.ods
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Polynom x. Grades erstellt mit python approximate.py
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für approximate.py numpy==1.22 notwendig. venv benutzen.
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Probe A:
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model order=4
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+5.388914121653647e-13*x^4 -8.847448650204697e-09*x^3 +7.44612274805891e-05*x^2 -0.057529180570340156*x^1 +18.953002079376887*x^0
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Excel:
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5.388914121653647e-13
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-8.847448650204697e-09
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7.44612274805891e-05
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-0.057529180570340156
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18.953002079376887
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Array:
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{18.953002079376887,-0.057529180570340156,7.44612274805891e-05,-8.847448650204697e-09,5.388914121653647e-13}
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Probe B:
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model order=4
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+5.529701600660142e-13*x^4 -9.161423581523883e-09*x^3 +7.671298605466989e-05*x^2 -0.08846039894456156*x^1 +40.838922264426685*x^0
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Excel:
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5.529701600660142e-13
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-9.161423581523883e-09
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7.671298605466989e-05
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-0.08846039894456156
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40.838922264426685
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Array:
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{40.838922264426685,-0.08846039894456156,7.671298605466989e-05,-9.161423581523883e-09,5.529701600660142e-13}
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polynom in c++ code übernommen und punktuelle ergebnisse aus adc zu ec funktion ausgegeben und geplottet zur kontrolle, ob rechnung funktioniert.
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bei lowADC den niedrigsten adc wert genommen in luft (siehe erste messungen).
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float ec_calibration_polynom_A[]={18.953002079376887,-0.057529180570340156,7.44612274805891e-05,-8.847448650204697e-09,5.388914121653647e-13}; //20240423, graphite electrodes
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float ec_calibration_linearize_below_adc_A=2000; //use linear approximation below this adc value. 0=disable
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float ec_calibration_linear_lowADC_A=728; //x0
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float ec_calibration_linear_lowEC_A=0; //y0
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float ec_calibration_polynom_B[]={40.838922264426685,-0.08846039894456156,7.671298605466989e-05,-9.161423581523883e-09,5.529701600660142e-13}; //20240423, graphite electrodes
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float ec_calibration_linearize_below_adc_B=2000; //use linear approximation below this adc value. 0=disable
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float ec_calibration_linear_lowADC_B=728; //x0
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float ec_calibration_linear_lowEC_B=0; //y0
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