Search Results for “conductivity”
Q: I am doing a conductivity study using Alconox detergent. I am seeing that the pH and Surface Tension listed on the COA differs between lots. Do you think these variables affect conductivity enough to alter my results?
A: Here’s the short answer… Surface tension does not have any interactive relationship with conductivity; pH has a very small, essentially negligible interaction with conductivity; and concentration and temperature are much bigger causes of change in conductivity.
Several years ago, our plant was directed to use the Refractive Index as a method of letting us monitor bath concentration during ultrasonic cleaning with your Liquinox detergent. More recently, our factory in Asia switched to Liquinox and were directed to use a conductivity measurement to monitor concentration. I decided to measure our cleaning bath using both methods and found a discrepancy — the brix (Refractive Index) reading was slightly above 1% concentration, but the Conductivity reading was nearly 2% concentration.
Q. How can I use conductivity to measure the concentration of a Solujet solution in order to control the concentration in a cleaning bath? A. In medical device cleaning machines that have sumps or baths that are used repeatedly for cleaning, the cleaner concentration will constantly be changing.
Q. We are in the process of developing a cleaning validation study for our laboratory glassware. The cleaning agent selected was Alconox. We are trying to establish acceptance criteria using the pH method to ensure successful removal of the cleaning agent. We did some trials using a solution made with mixtures of the Di water, which is 1000 ppm to see what it looks like but the results were not clear to me. How about the other method as conductivity? Read The Answer . . .
Q. How does a conductivity controller regulate a dosing pump in a machine washer?
A. A conductivity probe would need to be set up in the sump of a machine washer. The conductivity recorded is sent to the conductivity controller that regulates the pump (usually a peristaltic pump) that dispenses the detergent into the sump. The pump dispenses until the correct conductivity is reached for the desired concentration. Typically a concentration of 0.5% or 0.1% detergent is desired.