Maintenance 121 
 
Important Note for the Explosion-protected Version in Degree of 
Protection II 3G 
Cleaning the Keyboard Overlay 
Due to the high surface resistance of the keyboard overlay 
(R > 1 Gigaohm) the gas analyzer has to be operated and maintained in 
such a way that the risk of a hazardous electrical discharge is ruled out 
(e.g. using only suitable cloth for cleaning).