Additional Equipment - Samson 3374 Mounting And Operation Instructions

Design and principle of operation

3.3 Additional equipment

The actuator can be equipped with mechani-
cal limit contacts or with resistance transmit-
ters to influence the tasks of control equip-
ment.
Mechanical limit contacts
Optionally, the actuator can be equipped
with two limit contacts. They consist of two
changeover switches. Their switching posi-
tions are changed independently from one
another by continuously adjustable cam
disks.
The limit contacts are suitable for retrofitting.
The installation and adjustment of the me-
chanical limit contacts is described in the 'In-
stallation' section.
Resistance transmitter
Optionally, the actuator can be equipped
with resistance transmitters. They are linked
to the gear and produce a resistance signal
between approx. 0 and 1000 Ω (usable
range 0 to 900 Ω) proportional to the valve
travel. They can be used to process the posi-
tion of the actuator stem. The resistance
transmitters are suitable for retrofitting. The
installation and adjustment of the mechani-
cal limit contacts is described in the 'Installa-
tion' section.
3-2 EB 8331-3 EN