34
EB 8384-1 EN
Attachment to the control valve – Mounting parts and accessories
4.6
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).
If a different reversing amplifier (item no.
1079-1118 or 1079-1119) is used, follow the
mounting instructions described in sec-
tion 4.6.1.
The following applies to all reversing am
-
plifiers:
The signal pressure of the positioner is sup-
plied at the output A
1
of the reversing ampli-
fier. An opposing pressure, which equals the
required supply pressure when added to the
pressure at A
1
, is applied at output A2.
The rule
A
1
+ A
2
= Z
applies.
A
1
:
Connect output A
1
to the signal pressure
connection on the actuator that causes the
valve to open when the pressure rises.
A2
: Connect output A
2
to the signal pressure
connection on the actuator that causes the
valve to close when the pressure rises.
4.6.1
Reversing amplifier
(1079-1118 or 1079-1119)
Mounting
1.
Mount the connecting plate (6) from the
accessories in Table 5 to the positioner.
Make sure that both O-rings (6.1) are
seated correctly.
2.
Thread the special nuts (1.3) from the ac-
cessories of the reversing amplifier into
the boreholes of the connecting plate.
3.
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
1
and
Z
.
4.
Place the reversing amplifier onto the
connecting plate (6) and screw tight us-
ing both the special screws (1.1).
5. Use a screwdriver (8 mm wide) to screw
the enclosed filters (1.6) into the connec-
tion boreholes
A
1
and
Z
.
NOTICE
Air can escape uncontrolled from the
signal pressure connection.
Do not unscrew the sealing plug (1.5)
out of the reversing amplifier.
Note:
The rubber seal (1.4) is not required
and can be removed when the seal-
ing plug is used.
Pressure gauge attachment
The mounting sequence shown in Fig. 14 re-
mains unchanged. Screw a pressure gauge
bracket onto the connections
A
1
and
Z
.
Pressure gauge
bracket
G ¼
1400-7106
¼ NPT
1400-7107
Pressure gauges for supply air Z and output
A
1
as listed in Table 1 to Table 5.
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