Conductivity issue with a certain manufacturer’s product

Thread Content

This post was last edited by zxg.wylton on 2016-8-18 at 15:44. This month I purchased an online conductivity meter from a company in Shanghai; it is showing some abnormal behavior when used in the field. Later, during \"research\" in the laboratory, conductivity and temperature were both simulated using resistance, and it was found that: for example, with an electrode constant of 0.1 and a fixed temperature of 25 degrees, using a 10 kOhm resistor yielded a value of 10 us/cm, which is correct. However, after short-circuiting the 10 kΩ resistor at the electrode terminal and then disconnecting it, the displayed value does not return to 10 us/cm; instead, it fluctuates between 30 and 50. It was further found that the parallel short-circuit resistor fails to return to the normal detection state when the resistance is below a certain value. I really haven’t encountered this issue with the conductivity of the 7 different model brands before. Another issue is that when a 0.1 probe is used, the measured deionized water level is 10 to 20 times higher than the normal value. I called the manufacturer, and they said I couldn’t use resistance simulation, using a lot of technical jargon; they also claimed that only their own electrodes could be used, saying I didn’t understand conductivity meters. I had hoped for some creative ideas, but I’m still confused: after all, I’ve been using over twenty different brands of conductivity meters for more than a decade now. It seems I need to be more careful when making purchases next time; another clause needs to be added to the technical terms. And study hard*. Or maybe I really am at fault.