I am trying to measure the resistivity of molten glass and it depends on the depth. So i wanna control the depth of electrodes at molten glass, but i don't know what's the hight of the liquid inside. So i don't know at which point will the electrodes touch the liquid so i can calculate from that point the depth. Does anyone have an idea?
Possible solutions depend very much on boundary conditions.
The most important one might be: Is the molten glass surface at a stable level, or does it vary over time?
Also: Are your electrode tips aligned in such a way that they are at the same distance from the molten glass surface?
And: How do you lower the electrodes? Do you e.g. use a stepper motor, or a micrometer screw gauge?
If the molten glass surface is exactly horizontal, and your electrodes all aligned at the same height, lower them slowly exactly vertical while monitoring the resistance value. Upon surface touch, there will be a stepwise change. Note the stepper motor count or micrometer gauge reading. From that point on, lower further with a known extension.
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