T 7511 EN
Type 3427 Manual Control Station
Series 420

Application
For panel mounting (front frame 72x144 mm)
Manual control unit for instrumentation with separate controller or other control equipment · Automation of industrial
and process plants · Fixed set point, follow-up or cascade control

The manual control unit is designed for input and output
signals of 0.2 to 1.0 bar and for a supply pressure of 1.4 bar.
The manual control unit is suitable for connection of theType 3423 Controller Module (u T 7521) with Type 3426
Control Room Housing (u T 7512) as well as other pneumaticstandardized controllers or corresponding control equipment.
It meets the special requirements of the processing industry.
Special features–– Compact design with a mounting depth of 180 mm(260 mm installation depth)–– Set point, controlled variable and system deviation areeasy to read off the vertical 100 mm-long flat scale–– All adjusters, switches and displays can be adjusted fromthe front

Fig. 1: Type 3427 Manual Control Station, front view–– Universal version (Type 3427-1), standard with selector
switch wint/wext–– Use in hazardous areas

Fig. 2: Type 3427-1 Manual Control UnitSAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 · samson@samson.de · www.samson.deEdition April 2019

Design and principle of operation
The Type 3427 Manual Control Unit consists of a housing,plug-in unit with displays and operating controls as well as aflexible hose harness, which connects the plug-in unit to theconnecting plate.
–– Fig. 3 shows the displays and operating controls.
–– Fig. 4 shows the functional diagram with the pneumaticcircuit.
–– Fig. 5 shows the pneumatic connection.
The internal set point is adjusted at the set point adjuster (5).
The external set point is input at the connection wext with an
input signal of 0.2 to 1 bar. The selector switch wint/wext (13)is used to select the internal or external set point. The internal
set point wint is selected in the delivered state. The selector
switch wint/wext (13) is accessible after releasing the lock (11)and pulling the plug-in unit (1.2) out of the housing (1.1). The
set point can be displayed at the set point display (4) and issued at the connection w as a 0.2 to 1 bar signal. The controlled variable is supplied as a 0.2 to 1 bar input signal at
the connection x and displayed at the controlled variable display (3).

2Set point and controlled variable are displayed on a scalewith 0 to 100 % range or physical measuring range. The
manual/automatic switchover (6) is used to select the manualor automatic mode. The supply pressure in manual mode
(1.4 bar) and (0 bar in automatic mode) is issued at connection S.
The manual output pressure (yH) is set at the adjuster (7) anddisplayed at the display (9). The automatic output pressure(yA) is applied to the connection yA and displayed at the display (8). Both output pressures are shown on a scale ranging
between 0 and 1.2 bar. The signal pressure is issued at theconnection y. The arrow symbol (12) is used to indicate theOPEN or CLOSED valve position at 100 % signal pressure.
The device is supplied with a supply pressure of 1.4 bar atconnection Z. After pulling out the plug-in unit, the supply
pressure can be tested at the test connection Xtest (21) usingthe yellow test connector included in the scope of delivery toconnect a pressure gauge using a hose with 2 mm inside diameter.

151463Manual control unit

1.1 Housing
1.2 Plug-in unit
1.4 Connecting plate

8

7

2Label12

3

Controlled variable display (x)114Set point display (w)5Set point adjuster

6

Manual/automatic switch

7Adjuster for manual mode

8

Automatic output pressure (yA) display

9

1.2

13

21

1.1

1.4

9

Manual output pressure (yH) display

11Lock12

Arrow symbol to indicate theOPEN or CLOSED valve position at100 % signal pressure

13wint/wext selector switch

21 Test connection for supply pressure

Fig. 3: Type 3427-1 Manual Control Unit, with the plug-in unit pulled out of the housing

2T 7511 EN

Type 3427 Manual Control Station

Type 3423 Controller Modulewith Type 3426 Control
Room Housing

Design and useywintx

wext

wextyw

w
yA
yH

yyH
yA
yH

Type 3427-1 Manual Control Station
The functional diagram shows the pneumatic circuit of theType 3427-1 Manual Control Unit.

Rw

ZyAZyASxx

Type 3423 Controller Module with Type 3426 Control RoomHousing
The functional diagram shows a complete controller made byinterconnecting Type 3427-1 Manual Control Unit withType 3423-2 Controller Module and Type 3426-2 Control
Room Housing u T 7512

PISRx

For fixed set point and slave control
Can be used as master or slave controller in cascade control

Symbols for schematic diagram
Pneumatic connection

Supply air

Pneumatic adjuster
Manual/automatic switch

Plug-on connection

Venting

Blind connection

Control circuits with Type 3427 Manual Control Unit (schematics)
Fixed set point control

Follow-up control

1211
wextx

Cascade controlx2x2

1
wext
2x1Pneumatic transmitter

2Type 3427 Manual Control Station

3

Type 3423 Controller Modulewith Type 3426 Control RoomHousing

3.1 Master controller
3.2 Slave controller

3y34y43

3.1 y3

3.2 y

4

4Control valvexControlled variable (actual value)
input

wext

External reference variable (external set point) inputy

Output pressure

Fig. 4: Control applications

Installation and connections
Two rails are used to fasten the manual control unit in the control panel. Pneumatic line connections: threaded holes 1/8 NPT in theconnecting plate
Type 3427 Manual Control Station
100Connections:90801.4137.5

1447060
4030
2010072

18025S

Binary output manual/automatic modew

Reference variable (set point) output

RFeedbackx

Controlled variable (actual value) input

yA

Manipulated variable input in automaticmode

C

Supplywext

External reference variable (external setpoint) inputy

Output pressure

1.4 Connecting plate for pneumatic connections

Syw

ZR

wext

xyA

Panel cut-out 138+1 x 68+0.7 mm
Distance between center lines:
Min. 73 or 170 mm

Seal unused connections with the threaded plugs
included in the scope of delivery.

Fig. 5: Dimensions in mm and connections

T 7511 EN3

Technical data
Type 3427 Manual Control StationVersion
Set point/controlled variable display

3427-1
2 metal bellows pressure gauge, upright · Signal range: 0.2 to 1 bar · Accuracy class 1 (synchronism 0.6)
Scale inscription: 0 to 100 % or special inscription with physical measuring range; length: 100 mm
2 bourdon tube pressure gauges, horizontal · Signal range: 0 to 1.2 bar · Accuracy class 2.5
Scale inscription: 0 to 1.2 bar; length: 36 mm

Output display
Adjuster for manipulated variable inmanual mode

Output signal 0.2 to 1 bar · Max. 0.02 to 1.35 bar
Max. air delivery >1.5 mn³/h · Air consumption depending on adjuster: 0.1 mn³/h

Input signal

0.2 to 1 bar

Output signal

0.2 to 1 bar · Max. 0.02 to 1.35 bar
Supply air 1.4 ±0.1 bar · Air consumption <0.15 mn³/h

Supply air
Air quality acc. to ISO 8573-1

Maximum particle size and density: Class 3 · Oil content: Class 2
Pressure dew point: Class 3 or at least 10 K below the lowest ambient temperature to be expectedPermissible ambient temperature
Pressure Equipment Directive−20 to +60 °C
2014/68/EU, Article 4.3 (sound engineering practice)Compliance
WeightApprox. 1.8 kg

Use in hazardous areas
The Type 3427 Manual Control Unit is suitable for use in hazardous areas of Zone 1 and 2 without its own EU-type examination certificate. A EU-type examination certificate according to 2014/34/EU (ATEX Directive) is not required.

Ordering text
Type 3427-1 for 0.2 to 1 bar

Scale inscription: specify range and unit.

Specifications subject to change without notice

T 7511 EN

2019-04-29 · English–– Type 3427 Manual Control Station