Burkert Type 8791 - Manual (Page 9)

9
Technical data
Internal position sensor
Axle for position sensor
Cable gland
Electronic module
Control system
Fig. 2: Structure, positioner Type 8791
5.2. General description
The positioner Type 8791 is a digital, electro-pneumatic position
controller for pneumatically actuated proportional valves. The device
incorporates the main function groups
- Position sensor
- Electro-pneumatic control system
- Microprocessor electronics
The position sensor measures the current positions of the propor-
tional valve. The microprocessor electronics continuously compare
the current position (actual value) with a set-point position value
specified via the standard signal input and supplies the result to the
position controller. If there is a control difference, the electro-pneu-
matic control system corrects the actual position accordingly.
6. Technical DaTa
6.1. conformity
In accordance with the EC Declaration of conformity, the positioner
Type 8791 is compliant with the EC Directives.
6.2. standards
Conformity with the EC Directives is verified by the following
standards.
EN 61000-6-3, EN 61000-6-2, EN 61010-1
6.3. operating conditions
noTe!
if used outside, the device may be exposed to direct sunlight
and temperature fluctuations which may cause malfunctions
or leaks!
• If the device is used outdoors, do not expose it unprotected to
the weather conditions.
• Ensure that the permitted ambient temperature does not exceed the
maximum value or drop below the minimum value.
english
Type 8791