"Intrisically Safe" is a technical term.
Putting the sending unit in the fuel tank and checking for it being shorted by using an ohm-meter is safe because ohm- (and multi-) meters are designed to be "intrisically safe".
In this context, that means that they do not use a high enough voltage or current to spark under any circumstances.
There is a whole field of study and set of design principles dedicated to how to make intrinsically safe tools for various applications.
Edit: there are almost certainly more criteria to being instrisically safe that just non-sparking (such as low current to avoid heat production, etc). My intent was to address your specific concern, not give a comprehensive list of applicable factors.
Last edited by Fibonachu; 03/18/2024 5:05 PM.
