Relationship between d.c. volts and electrolysis in steel

AI Thread Summary
A 10v AC signal is used with a small steel sensor (SMO 254) in wastewater applications to detect liquid levels by identifying a conductive path to ground. DC is avoided due to the risk of electrolysis, which can degrade the sensor over time. There is interest in understanding the relationship between DC voltage increases and the electrolysis effect, specifically in terms of material loss over time. The polarization curve, which plots applied potential against log current, is suggested as a useful reference for this analysis. Understanding these factors is crucial for maintaining sensor integrity in wastewater management.
stevecarson
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We use a 10v a.c. signal through to a small steel sensor (SMO 254) in wastewater - and the control device looks for a conductive path to ground to determine that the level of liquid is over the sensor.

We don't use d.c. because of the electrolysis effect - but the circuit we use could have a d.c. component - which might mean that over a period of time the sensor gets eaten away.

Is there a graph or formula for increases in d.c. voltage vs electrolysis effect (e.g. mm/yr)?

Thanks
Steve
Brisbane
 
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One probably wants to find the polarization curve, i.e. applied potential vs log I (current), for SMO 254.
 

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