Reversing Amplifier For Double-Acting Actuators - Samson 3767 Mounting And Operating Instructions

Mounting on control valves
3.3.4 Reversing amplifier for
double-acting actuators
For the use with double-acting actuators, the
positioner must be fitted with a reversing am-
plifier, e.g. the SAMSON Type 3710 Revers-
ing Amplifier (see Mounting and Operating
Instructions u EB 8392).
The signal pressure of the positioner is sup-
plied at the output A
fier. An opposing pressure, which equals the
required supply pressure Z when added to
the pressure at A , is applied at output A
1
The rule A + A = Z applies.
1 2
If a different reversing amplifier (item no.
1079-1118 or 1079-1119) is used, follow
the mounting instructions described below:
Mounting
NOTICE
When using a reversing amplifier, the
pressure regulator (9) must be turned
as far as it will go in the clockwise di-
rection.
Remove the sealing plug (1.5) before
mounting the reversing amplifier. The
rubber seal (1.4) must remain in-
stalled.
1. Screw the special nuts (1.3) from the ac-
cessories of the reversing amplifier into
the threaded connections of the position-
er.
2. Insert the gasket (1.2) into the recess of
the reversing amplifier and slide both the
hollowed special screws (1.1) into the
connecting boreholes A
32
of the reversing ampli-
1
and Z.
1
3. Place the reversing amplifier onto the po-
sitioner and screw tight using the two
special screws (1.1).
4. Use a screwdriver (8 mm wide) to screw
the enclosed filters (1.6) into the connec-
tion boreholes A
Signal pressure connections
A
: Connect output A
1
connection on the actuator that causes the
valve to open when the pressure rises.
A2: Connect output A
. connection on the actuator that causes the
2
valve to close when the pressure rises.
Pressure gauge attachment
The mounting sequence shown in Fig. 11 re-
mains unchanged. Screw a pressure gauge
bracket onto the connections A
Pressure gauge bracket:
− G ¼ 1400-7106
− ¼ NPT 1400-7107
Pressure gauges for supply air Z and output
A as listed in Table 4 and Table 5.
1
and Z.
1
to the signal pressure
1
to the signal pressure
2
and Z.
1
EB 8355-2 EN