2.3.4 Reversing amplifier for
double-acting actuators
For the use with double-acting actuators, the
positioner must be fitted with a reversing
amplifier.
Type 3710
Refer to the Mounting and Operating In
-
structions EB 8392 EN for the mounting of
the SAMSON Type 3710 Reversing Ampli
-
fier.
1079-1118 or 1079-1119
If a different reversing amplifier (item no.
1079-1118 or 1079-1119) is used, follow
the mounting instructions described below:
The output signal pressure of the positioner
is supplied at the output A
1
of the reversing
amplifier. An opposing pressure, which
equals the required supply pressure when
added to the pressure at A
1
, is applied at
output A
2
.
The rule A
1
+ A
2
= Z applies.
On using the reversing amplifier, make sure
that the adjuster of the pressure regulator (9
in Fig. 2) is turned as far as it will go in the
clockwise direction. Refer also to section
3.1.2.
Mounting
Note: Remove the sealing plug (1.5) before
installing the reversing amplifier. The rubber
seal (1.4) must remain installed.
1. Thread the special nuts (1.3) from the
accessories of the reversing amplifier
into the threaded holes of the positioner.
2. Insert the gasket (1.2) into the recess of
the reversing amplifier and push both
the special hollow screws (1.1) into the
connecting boreholes A
1
and Z.
3. Place the reversing amplifier onto the
positioner and screw tight using both the
special screws (1.1).
Signal pressure connections
A
1
: Connect output A
1
to the signal pressure
connection on the actuator that opens the
valve when the pressure increases.
A
2
: Connect output A
2
to the signal pressure
connection on the actuator that closes the
valve when the pressure increases.
Pressure gauge attachment
The mounting sequence shown in Fig. 11 re-
mains unchanged. Screw a pressure gauge
bracket onto the connections A
1
and Z.
Pressure gauge G ¼ 1400-7106
bracket: ¼ NPT 1400-7107
Pressure gauges for supply air Z and output
A
1
as listed in Tables 4, 5 and 7.
26 EB 8355-1 EN
Attachment to control valve
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