Samson 3760, Mounting And Operating Instructions

The symbols indicating the direction of

action are marked on the booster. The de-

sired symbol must be aligned with the arrow

stamped on the positioner housing.
If the indicated symbol does not correspond

with the required direction of action, pro-

ceed as follows: remove the mounting screw

and booster. Rotate booster by 180°, rein-

stall it and fasten it with the screw.

Note:

If the adjusted direction of action of

an attached positioner must be changed at a

later stage, the mounting positions of the

booster and positioner on the valve must be

changed as well.

Attachment on the left or right side specifies

that, when looking onto the switchover plate

or the signal pressure connection, the

positioner must be secured on either the

right or left side of the actuator yoke. The

signal pressure output (output 36) of the

positioner must point to the front towards the

connections (Fig. 2).

2.2 Mounting the clamp

After attaching the positioner to the yoke,

the clamp must be secured to the actuator

stem on the opposite side (Fig. 4).
1. Insert the clamp in the yoke next to the

actuator stem (for 120 cm² actuators, tilt

by 90° prior to inserting it).

2. Plug the clamp onto the actuator stem

and secure it with the clamping screw.

Make sure that the clamping screw rests

in the groove of the actuator stem and

that the clamp is aligned at an exact

right angle.

3. Hook up the range spring between the

lever of the clamp and the SPAN adjust-

ment screw, placing it in the outer

groove with 5 and 6 mm travel and in

the inner groove with 10.5 and 12 mm

travel. Turn ZERO adjustment screw to

slightly tension the spring.

The range spring of the positioner is as-

signed to different travels and input ranges

which must be selected according to the ta-

ble on page 11. The range springs are

color-coded.
Adjust the positioner before closing the actu-

ator yoke with the cover plate (see

section 4).

When making adjustments during op-

eration, the actuator is under pres-

sure. The moving actuator stem can

cause severe injuries to hands and

fingers.

Always use tools when working on

the clamp and range spring!

10

EB 8385 EN

Attachment to actuators