We are working on a meter to test PH of water soluble machining fluids. Range does not move much from 7 but should stay alkaline. If they move towards acidic, there are problems. We already have a circuit that we use for general sensor measurements but finding ready made PH sensors outrageous and kind of wondering what technologies are used to create a PH sensor?
Is this a difficult task? We already make some basic sensors such as J TCs, thermistors, etc and have the manufacturing capabilities. Just wondering how they are made.
Thanks