Description Of System; Configuration And Function - Burkert 8690 Manuel D'utilisation

5. DEscripTiOn Of sysTEM
5.1. configuration and function
The Pneumatic Control Unit Type 8690 can control single or double-
acting process valves.
The Pneumatic Control Unit Type 8690 has been optimized for
integrated, modular installation on process valves of the 21xx series.
The module configuration permits a variety of expansion steps.
For installation on the 20xx series there is a special model which is
described in Chapter "5.1.2".
5.1.1. pneumatic control unit for integrated
installation on 21xx series
Cable gland M16 x 1.5
Fig. 2:

Configuration and function (1)

12
Transparent cap
Pilot air port
label: 1
Exhaust air connection
label: 3
Pressure limiting valve
(for protection against too
high internal pressure in
case of error)
english
Type 8690 Ex

Description of system

Optical position indicator:
The device status is displayed on the pneumatic control unit (yellow
mark).
Option: electrical position feedback
Optionally inductive limit switches (proximity switches) can measure
the valve position.
View without transparent cap:
Air intake filter (exchangeable)
Fig. 3: Configuration and function (2)
Screw for adjustment
of the lower proximity
switch
Optical position indi-
cator (yellow mark)
Screw for adjustment
of the upper proximity
switch
Screw terminals
Pilot valve (3/2-way
or 5/2-way solenoid
valve with hand lever)
Fastening screws (2x)