Why is a double junction electrode better than a single junction electrode?
A. A double junction electrode is less likely to become clogged because the second junction is located higher up in the probe out of contact with the sample. It is also less likely to become poisoned since a ‘salt bridge’ isolates the first junction from the second junction. Q. Is automatic temperature compensation (ATC) really necessary? A. The necessity of ATC depends on the required accuracy of a pH reading. pH readings vary with temperature. For example, a sample with a pH of 7 at 25 deg C, may have a pH of 7.08 at 5 deg C and a pH of 6.98 at 60 deg C. Q. When do you use a half cell? A. When you are measuring a pressurized flow in a stream or pipe. The reference half cell would be mounted upstream, the measuring electrode would be mounted down stream. Q. How often do I need to calibrate my pH meter? A. Before each use or set of uses. Q. How can you unclog a pH electrode? How can you restore a dry pH electrode? A. First check the interior wire. If corrosion is evident, replace the e
