Water quality array – temperature compensation
In trying to get our two units to agree, we noticed that the DS18S20 temperature probes seem to be off 0.5 to 0.75 C from one another. Given that all probes use temperature compensation (and the dissolved oxygen uses it for calibration), this slight difference could be exacerbating any differences we were noticing.
So, we placed both temperature sensors in a cooler of ice water to generate a manual, one-point temperature compensation for each of our units. For each unit, we let the probe sit in ice water for at least 5 minutes and then took five consecutive readings one minute apart from one another.