Loading and unloading road tankers with flammable liquids and powders generate enormous amounts electrostatic charge which could discharge incendive sparks that exceed the minimum ignition energies of a vast range of combustible gases, vapours and dusts. By using earthing monitoring and electrical grounding systems, the ignition of such atmospheres by static electricity can be prevented by ensuring the road tanker has a verified connection to earth. The road tanker version monitors the condition of the earth signal and provides a permissive signal for the process operation. Deprivation of the earth continuity or attempts to avoid use of the earthing system will eliminate the permissive signal, stopping the process and ensuring the safety of the driver and operator.
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