2 ms·

I don't think it's the quality of the probe so much as whatever is in the fluid you are measuring. There are simple reactions going on and much less simple ones

I don't think it's the quality of the probe so much as whatever is in the fluid you are measuring. There are simple reactions going on and much less simple ones, including biological stuff accumulating. An additional problem I've seen is that the temperature sensor for compensation is almost always supposed to be on the circuit rather than in the probe or external. Which is fine in some applications but useless for example for heated aquariums. If you don't want to recalibrate the probe all the time you probably need to figure out a solution to have the probe in a compartment that gets flooded with clean water vs sample fluid.

the__alchemist 6y ago
I'm wondering how feasible it would be to make a system with 3 pumps, and holders for ion-selective probes (pH, ORP etc). In an automated process, flood with sample; measure; evacutate; flood with water to clean; evacuate; flood with KCL to store. Probably too expensive to be practical. For temp compensation: I'm not sure the best approach. Temp dependence is loose, so you can get away with a reasonable temperature error for most applications. I went with on-circuit air temp sensor, with the ability in the drivers to feed in an offboard value. This is a reasonable approximation in many cases, but as you point out, for heated tanks, large ones, in-ground ones, or open bodies of water etc, you need to measure water temp directly.