Samson 3767, Mounting And Operating Instructions

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8 EB 8355-2 EN
Design and principle of operation
When a control signal corresponding to the
binary signal '1' (ON) is applied to the in-
put, the signal pressure p
st
is applied to the
actuator, allowing the valve to move accord -
ing to the input signal issued by the control
equipment.
Positioner with position transmitter
A positioner containing a position transmit -
ter cannot be equipped with integrated limit
contacts or an integrated solenoid valve
since the position transmitter requires most of
the space inside.
The position transmitter is used to assign the
valve position, i.e. the valve travel, to an out
-
put signal of 4 to 20 mA. The tuning of the
position transmitter ensures that both end
positions "valve CLOSED" or "valve OPEN"
as well as all intermediate positions can be
signalized. Since the valve position is signal -
ized independently of the input signal to the
positioner, the position transmitter is a suit
-
able option for checking the actual valve po-
sition.