Vernier Software and Technology
Vernier Software & Technology
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How can I have my ISE read mV output instead of mg/L?

There is an experiment file (within Probes & Sensors/ISE) in Logger Pro (version 3.4 or newer) that does this for you using the following equations:

For the Nitrate ISE, the equation that converts mg/L to mV is:
23.92*(13.8-ln("Nitrate (mg/L)"))-168.23 = Nitrate (mV)

For the Chloride ISE, the equation that converts mg/L to mV is:
23.907*(18.415-ln("Chloride (mg/L)"))-168.23 = Chloride (mV)

For the Calcium ISE, the equation that converts mg/L to mV is:
-11.96*(-14.942-ln("Calcium (mg/L)"))-168.23 = Calcium (mV)

For the Ammonium ISE, the equation that converts mg/L to mV is:
-23.889*(-7.487-ln("Ammonium (mg/L)"))-168.23 = Ammonium (mV)

For the Potassium ISE, the equation that converts mg/L to mV is:
-23.5*(-7.2-ln("Potassium(mg/L)"))-168.23 = Potassium (mV)

This puts it in pre-amplification mV. If you want post-amplification Volts, the equation is:

V = 0.00727*mV + 1.223

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