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4 DOC,F20,EDN Rev.: -
1.0 Introduction / Einführung / Introductie
1.0
1.1 Product Description F20
El-o-matic POSIFLEX positioners belong to the most advanced
positioners of their type on the market today. This latest version
is made possible by a combination of the newest electronics
developments with a high precision spool type pneumatic pilot
for the volume amplifier.
The F20 is a true 2 wire instrument: An industry standard 4 to
20 mA. signal provides both the controlling signal and the
power supply for the electronics. As such the positioner is plug
compatible with the current industry standard.
The use of electronics as the controlling element means that all
the usual control characteristics: Zero, range and sensitivity
are all electronically resettable using trimmers on the control
card.
Both rotary and linear applications are catered for, the differ-
ence being with feedback mechanism and the mounting
methods. A single universal positioner is suitable for both
double acting and single acting (spring return) actuators. The
standard internal feedback provides a linear relationship
between the input signal and the output movement.
The functionallity of the F20 positioner can be extended by a
"Plug-in" PTF20 Option for a analog 4-20mA feedback signal.
This option is, well protected, mounted inside the F20 enclo-
sure and has its own feedback potentiometer.
ELECTRO-PNEUMATIC
POSITIONER
F20
Rotary
Linear
Closed
Open Open
Closed