Part 1 â‹… L101 EN
Each unit has its own graphical symbol that is usually standardized. Equipment consisting of various units is often represented by several lined-up symbols.
hand-operated actuator
diaphragm actuator
motor-driven actuator
valve
motor-driven butterfly valve
valve with diaphragm actuator
controller (former symbol)
controller
PI PI controller
valve with diaphragm actuator and attached positioner functions performed by
SAMSON AG â‹… 00/03
software are marked root-extracting element, software-based
software counter with limit switch
with a flag
Fig. 11: Graphical symbols for controllers, control valves and software-based functions according to DIN 19227 Part 2
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