Samson 3271, Original Instructions Manual, Page: 32 / 72

5-4 EB 8310-6 EN
Mounting and assembly
5.2.2 Connecting the air
supply
Determine the lower and upper signal pres-
sure range values before connecting the sup-
ply air:
− The lower signal pressure range value is
the same as the minimum value of the
bench range or operating range (with
preloaded springs).
− The upper signal pressure range value is
the same as the maximum value of the
bench range or operating range (with
preloaded springs).
− For actuator springs that are to be pre-
loaded subsequently, determine the up-
per and lower signal pressure range as
described in 'Preloading the springs' in
the 'Start-up' section.
a) Actuator stem extends
1. Apply a signal pressure that corresponds
to the lower signal pressure range value
to the connection on the bottom dia-
phragm case.
2. Screw the vent plug into the connection
on the top diaphragm case.
b) Actuator stem retracts
1. Apply a signal pressure that corresponds
to the upper signal pressure range value
to the connection on the top diaphragm
case.
2. Screw the vent plug into the connection
on the bottom diaphragm case.
Table 5-1: Values for dimension x 1) (see Fig. 5-1)
Actuator area Travel in mm Dimension a in mm
240
0 (0 %) 75
15 (100 %) 60
17 (112.5 %) 58
350
0 (0 %) 75
15 (100 %) 60
19 (125 %) 53
700
0 (0 %) 90
30 (100 %) 60
38 (125 %) 52
1)
Type 3271: bottom edge of the bottom case to the top of the actuator stem
Type 3277: bottom edge of the bottom case to the top of the actuator stem