Hypersensing questions

Consumables are used, probably 50% life left at least though. Copper plus electrode and fine cut nozzle. Ohmic shield.

However I did do a couple of cuts with the standard nozzle/shield and had no problems there either, but didn't record any data

Consumable condition will have no bearing on this.

The contact is between the shield and the material.

Anything on the electrode side can only affect the noise in the base signal which we have smoothed with the moving average anyway.

But we are not interested in the voltage at idle.

We are only interested in sensing when it rises when there is a good connection with the material by the shield. It should get to 24 volts. The conductivity of the water around the world will vary greatly with the water source and the additive used. Remember that pure water is an insulator, its the dissolved salts and the like that conducts electricity.

Hmm.. 24.5V full scale and 23.5V from leakage means that you have about 1K leakage resistance when wet...
Sounds like you have a very high salt concentration in your water or some issue with your torch

I put a brand new set of consumables in (copper plus electrode and fine cut nozzle). My ohmic shield is the same, I don't have a spare for that.

First I took the torch and soaked it in the water for about 10 seconds, covering up the entire ohmic shield. Pulled it out of the water and it was reading 22-23V, and tripping my ohmic sensor. However, after pulsing the torch for 0.1 seconds, it went right back to 0v.

Then I did a second test where I pulsed the torch to get air flowing with it 1 inch over top the water. I let the air run the entire time and soak the torch. Same thing, 22-23v at idle afterwards. I did another post pulse air flow over steel and it immediately went to 6-7v, and lowered to 1-2 about 10 seconds later.

I agree that ohmic-volts can still hover around 22-23v when the torch is completely soaked, but I haven't been able to not clear it up via pulsing. Before the 22K (sensitivity adj resistor), I would pulse the torch and it still wouldn't clear a really wet torch. It would stay at 22-23v after air turned off. Now I can't seem to replicate it.

In the second picture, I increased the gain on the ohmic-volts signal 50X to show that it is indeed at 0v. 200mV per division instead of 10V.

Can you tell us what happens when you pulse the torch and have air flowing through it? Does it stay at 23v or drop?