High voltage protection

[ardhuru]

I had worked on an almost identical product, for the very same application. Except the requirement was to detect resistances of more than 2 ohms.

Mine was a very simple device based around a 12F675, using its ADC. I wasnt aware of the static buildup on the tanker being of that magnitude at all. Perhaps it also has to do with the geographical location you are in? I thought the few volts of static would get grounded when the cable gets connected. Or maybe I need to recall all units...

But if it really goes up that high, shouldnt you also worry about discharging it at one go? I mean, it would be much safer to dissipate it slowly, wouldnt it?

Regards,

Anand

[Ioannis]

The www.newson-gale.co.uk company has a lot of infos about the case.

Now, my next step was to measure the resistance of the earth. Newson-Gale turn off the fuel valves when this resistance is more than 10ohms.

I would be greatfull for any infos you can share on your project.

Ioannis