Samson 3766 - Reversing Amplifier for Double-Acting Actuators

32 EB 8355-1 EN
Mounting on control valves
3.3.4 Reversing amplier for
double-acting actuators
For the use with double-acting actuators, the
positionermustbettedwithareversingam-
plier,e.g.theSAMSONType3710Revers-
ingAmplier(seeMountingandOperating
Instructions uEB8392).
The signal pressure of the positioner is sup-
plied at the output A
1
of the reversing ampli-
er.Anopposingpressure,whichequalsthe
required supply pressure Z when added to
the pressure at A
1
, is applied at output A
2
.
The rule A
1
+ A
2
= Z applies.
Ifadifferentreversingamplier(itemno.
1079-1118or1079-1119)isused,follow
the mounting instructions described below:
Mounting
When using a reversing amplier, the pres-
sure regulator (9) must be turned as far as it
will go in the clockwise direction.
Remove the sealing plug (1.5) before mount-
ing the reversing amplier. The rubber seal
(1.4) must remain installed.
1. Screw the special nuts (1.3) from the ac-
cessoriesofthereversingamplierinto
the threaded connections of the position-
er.
2. Insert the gasket (1.2) into the recess of
thereversingamplierandslideboththe
hollowed special screws (1.1) into the
connecting boreholes A
1
and Z.
3. Placethereversingamplier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lters(1.6)intotheconnec-
tion boreholes A
1
and Z.
Signal pressure connections
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.
Pressure gauge attachment
ThemountingsequenceshowninFig.10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4,Table5andTable7.
NOTICE
!