Burkert Type 8693 - Manual (Page 19)

19
Description of system,
6.3. function diagram of the positioner with single-
acting actuator
The black lines describe the function of the position controller (Type 8692). The process controller (Type 8693)
includes the position controller and the functions which are illustrated in grey.
Control system
1
2
Position
controller
Process
controller
Nominal position
Control system
1: Aeriation valve
2: Bleed valve
Compressed-
air supply
Exhaust air
Position
measuring
system
Actual
position
Process set-point
value
External position
set-point value
positioner
Pneumatic actuator
(single-acting)
Valve
Sensor
Process actual value
(flow, pressure, level,
temperature, et cetera.)
Process actual value
Figure 3: Function diagram
english
Type 8692, 8693