Common causes for electrostatic charge:
•    Spreading of the electrostatic charge by staff
•    Spreading of the electrostatic charge by filling portable bins
•    Insufficient grounding of conducting (metallic) parts
•    Spraying of liquids (Lenard effect)
•    Induction 

Whilst handling flammable substances electrostatics pose a high danger! To avoid this threat, the relevant guidelines (TRBS 2153, BGR) demand the following:Portable bins in Ex-areas have to be grounded during filling / emptying process. KERSTING GMBH SAMPLING + GROUNDING offers you the corresponding suitable products.  

Ground monitoring systems

Grounding accessories

Unfortunately, although there are many good explosion prevention / explosion protection systems available, there are still far too many accidents, especially in cereal mills: 

Accidents happens due to the generating of electrostatic charges that can cause sparks - read more at EngineerLive