Hach SC4500 Manuel D'instructions page 5

Section 8 Maintenance
D A N G E R
Explosion hazard. Do not connect or disconnect electrical components or circuits to the equipment
unless power has been switched off or the area is known to be non-hazardous.
W A R N I N G
Explosion Hazard. Do not remove or replace the display board cover or the battery unless power has
been disconnected or the area is free of ignitable concentrations.
English 5