Basic safety instructions Liquisys M CPM223/253
6 Endress+Hauser
1.5 Product safety
The product is designed to meet state-of-the-art safety requirements, has been tested and
left the factory in a condition in which it is safe to operate. Relevant regulations and
European standards have been observed.
1.6 Electrical symbols
%
Direct Current (DC)
A terminal at which DC is applied or through which DC flows.
&
Alternating Current (AC)
A terminal at which (sine-form) AC is applied or through which AC flows.
)
Ground connecting
A terminal which, from the user’s point of view, is already grounded using a grounding
system.
*
Protective ground terminal
A terminal which must be grounded before other connections may be set up.
Class II (isolated ) device
Double insulation
b
Alarm relay
Input
Output
DC voltage source
Temperature sensor
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