Samson 430 Series Service manual

Translation of original instructions
EB 7030 EN
Type3430 Pneumatic Indicating Controllers
Series430
Edition May 2018
Type3432 Controller Station
- with Type3435 Transmitter Module for pressure
- with Type3436 Transmitter Module for temperature
- with Type3438 Transmitter Module for temperature (Pt100)
- for standardized signals
The version with lockable door and installed Type3436
Transmitter Module for temperature is shown.
Type3431 Controller Station
- for standardized signals

Note on these mounting and operating instructions
These mounting and operating instructions assist you in mounting and operating the device
safely. The instructions are binding for handling SAMSON devices.
ÎFor the safe and proper use of these instructions, read them carefully and keep them for
later reference.
ÎIf you have any questions about these instructions, contact SAMSON‘s After-sales Service
([e-mail]).
The mounting and operating instructions for the devices are included in
the scope of delivery. The latest documentation is available on our website
at www.samsongroup.com > Service & Support > Downloads >
Documentation.
Denition of signal words
Hazardous situations which, if not avoided,
will result in death or serious injury
Hazardous situations which, if not avoided,
could result in death or serious injury
Property damage message or malfunction
Additional information
Recommended action
DANGER
!
WARNING
!
NOTICE
!
Note
Tip
2 EB 7030 EN
WARNING!
Damage to health relating to the REACH regulation.
If a SAMSON device contains a substance which is listed as being a substance of
very high concern on the candidate list of the REACH regulation, this circumstance is
indicated on the SAMSON delivery note.
Information on safe use of the part affected uwww.samsongroup.com/en/about-
samson/material-compliance/reach-regulation.html.

Contents
EB 7030 EN 3
1 General safety instructions.............................................................................5
2 Application ...................................................................................................6
3 Operation.....................................................................................................6
3.1 Settings at the controller modules ....................................................................6
3.1.1 Direction of action ..........................................................................................6
3.1.2 Air output capacity ........................................................................................7
3.1.3 Proportional-action coefcient KP ....................................................................8
3.1.4 Reset time Tn .................................................................................................8
3.1.5 Derivative-action time Tv .................................................................................8
3.1.6 Operating point .............................................................................................8
3.2 Adjusting the limit contacts .............................................................................9
4 Start-up and settings ...................................................................................10
4.1 Tuning the controller .....................................................................................10
4.2 Adjusting the operating point in P and PD controllers ......................................11
4.3 Bumpless automatic/manual mode changeover ..............................................12
4.4 Bumpless changeover between internal or external set point ............................12
4.5 Readjusting the controller zero point ..............................................................12
5 Design and principle of operation ................................................................13
5.1 Transmitter modules ......................................................................................14
5.2 Controller station .........................................................................................16
5.3 Controller modules .......................................................................................16
5.3.1 Type3433 Controller Modules ......................................................................16
5.3.2 Type3434 Controller Module .......................................................................20
5.4 Diaphragm seal ...........................................................................................21
5.4.1 Mounting with diaphragm seal......................................................................21
5.4.2 Diaphragm seal for general use ....................................................................22
5.4.3 Diaphragm seals for use with oxygen ............................................................22
5.4.4 Diaphragm seals for use with ammable gases ..............................................22
5.5 Additional units ...........................................................................................25
5.5.1 Type6112 i/p Converter ..............................................................................25
5.5.2 wint/wext selector switch................................................................................25
5.5.3 Supply pressure regulator .............................................................................25
5.5.4 Inductive limit contacts ..................................................................................26
6 Installation..................................................................................................26
6.1 Mounting ....................................................................................................26
6.1.1 Changing scales ..........................................................................................33
6.2 Installing the temperature sensor ...................................................................33

Contents
4 EB 7030 EN
7 Connections ................................................................................................36
7.1 Pneumatic connections..................................................................................36
7.1.1 Connection examples ...................................................................................36
7.1.2 Adjusting the supply air in supply pressure regulators .....................................37
7.2 Electrical connections ...................................................................................38
8 Maintenance ...............................................................................................40
8.1 Checking the air supply ................................................................................40
9 Conversion..................................................................................................41
9.1 Changing the controller function ....................................................................41
9.2 Exchanging the transmitter module ................................................................44
9.3 Checking the controller function ....................................................................44
10 Use in hazardous areas...............................................................................45
10.1 Servicing explosion-protected devices ............................................................46
11 Technical data .............................................................................................47
12 Certicates..................................................................................................51

EB 7030 EN 5
General safety instructions
1 General safety instructions
−The device must be mounted, started up or serviced by fully trained and
qualied personnel only; the accepted industry codes and practices are to
be observed. Make sure employees or third persons are not exposed to any
danger.
−All safety instructions and warnings given in these mounting and operating
instructions, particularly those concerning installation, start-up and mainte-
nance, must be strictly observed.
−Devices with a CE marking have an EU declaration of conformity, which
includes information about the applied conformity assessment procedure.
The EU Declaration of Conformity is available on request.
−According to these mounting and operating instructions, trained personnel
refers to individuals who are able to judge the work they are assigned to
and recognize possible dangers due to their specialized training, their
knowledge and experience as well as their knowledge of the applicable
standards.
−To ensure appropriate use, only use the device in applications where the op-
erating pressure and temperatures do not exceed the specications used for
sizing the device at the ordering stage.
−The manufacturer does not assume any responsibility for damage caused by
external forces or any other external factors.
−Proper transport, storage, installation, operation and maintenance are as-
sumed.

6 EB 7030 EN
Application
2 Application
The Series430 Pneumatic Controllers are
used for the automation of process and in-
dustrial plants.
The controllers measure directly the
controlled variable (pressure, temperature,
electric or pneumatic standardized signal),
compare the measured value with the set
point and issue a pneumatic control signal of
0.2 to 1bar (3 to 15psi).
A supply pressure of 1.4bar ±0.1bar
(20psi ±1.5psi) or an operating air pres-
sure of 2 to 12bar (30 to 180psi) with an
installed supply pressure regulator is re-
quired.
3 Operation
3.1 Settings at the controller
modules
The controller module in the station can be
accessed after releasing the lock (4, Fig.1)
and opening the indicating unit (5).
The settings for direction of action (turnboard
A) and air delivery (turnboard B) must be
performed prior to start-up.
Unscrew the fastening screw (6) at the con-
troller module, pull the module off its self-
seal push-on ttings and lift it out of the con-
troller station.
3.1.1 Direction of action
The direction of action for the control loop is
set at the turnboard A, where the position of
its arrow symbol according to the arrow
symbol on the controller module determines
the direction of action of the controller
(Fig.1).
 Arrow tips facing opposite directions:
Direction of action: increasing/
decreasing
As the controlled variable x
increases, the output pressure y falls.
 Arrow tips facing the same direction:
Direction of action: increasing/
increasing
As the controlled variable x
increases, the output pressure y
increases.
Setting or changing the direction of action:
Undo the screw in turnboard A (Fig.1) and
lift it off together with the turnboard. If nec-
essary, lever the board at the side. Do not
lose the rubber seal.
Î Turn the board by 90° so that the re-
quired arrow is aligned with the arrow
on the base plate.
ÎInsert board and tighten the screw.
ÎRemount the controller module and
fasten it in the controller station.

EB 7030 EN 7
Operation
3.1.2 Air output capacity
(Type3433 Controller Module only)
The position of turnboard B (Fig.1) with its
arrow symbol determines the air delivery to
the feedback bellows. It can only be ac-
cessed after removing the comparator (3.1).
yA Normal air delivery
Approx. 1mn³/h per % of the system
deviation
RHigh air delivery
approx. 3mn³/h per % of the system
deviation (not with P or PD controller
modules)
Direction of
action
A
8
B
1.1
1.4
1.3
5
4
1
10
11
12
7
83.4
3.2 A
3.3
9
1 Controller station (Type3432)
1.1 Dial plate
1.3 Controlled variable pointer
1.4 Set point adjuster
2Transmitter module or base
3 Controller module
3.1 Comparator
3.2 Connecting plate
3.3 Hex screws
3.4 Screws (inside)
4 Lock
5 Indicating unit
6 Fastening screw
7Restriction with lter
8 Zero adjuster
9Kp adjuster
10 Tn adjuster
11 Tv adjuster (PD or PID
controller only)
12 Operating point adjuster (P
or PD controller only)
Turnboard
ADirection of action
BAir output capacity
91036
Type3433-3 Controller Module (PID)Type3433 Controller Module
View from the side without
comparator
Type3434-2 Controller Module (PI)
2
3
6
Fig.1: Turnboards and adjusters

8 EB 7030 EN
Operation
ÎUndo screws (3.3) and pull off the
connecting plate (3.2) together with
square nuts and bolts from the controller
module.
ÎUnscrew the hexagonal socket head
screws (3.4) at the side and lift the com-
parator (3.1) off the controller module.
Setting or changing the air delivery
ÎUndo the screw in turnboard B and lift it
off together with the turnboard. If neces-
sary, lever the board at the side. Do not
lose the rubber seal.
ÎTurn the board so that the arrow is
aligned with yAor R on the controller
module. Insert board and tighten the
screw.
ÎRemount the controller module and fas-
ten it in the controller station.
3.1.3 Proportional-action coef-
cient Kp
The setting of the Kp (adjuster 9) determines
the controller gain and depends on the con-
trolled system that is to be tuned (see sec-
tion4.1).
3.1.4 Reset time Tn
Controller versions with integral-action
component require the reset time to be set at
the adjuster (10). The setting depends on the
controlled system that is to be tuned (see
section4.1).
3.1.5 Derivative-action time Tv
Controller versions with derivative-action
component require the derivative-action time
Tv to be set at the adjuster (11). The setting
depends on the controlled system that is to
be tuned (see section4.1).
3.1.6 Operating point
Controller modules without integral-action
component, such as P or PD controllers, have
an operating point.
This can be adjusted at the operating point
adjuster (12) between 0 and 100%, which
corresponds to 0.2 to 1bar in Types3433-
1/-4/-5/-6 Controller Modules.
The setting depends on the output pressure y
(see section4.1).
The operating point of the Type3434-1
Controller Module is xed at 0.6bar.

EB 7030 EN 9
Operation
3.2 Adjusting the limit contacts
Only with controller station that have the op-
tional inductive limit contacts.
Before adjustment, release the lock (4,
Fig.1) and open the indicating unit (5). The
contacts can be accessed on the back of the
device.
Use a screwdriver to move the proximity
switches in the holders between 0 and
100% on the scale until contact is made with
the aid of a connected switching amplier.
Fig.2: Limit contacts
Holder with proximity switch

10 EB 7030 EN
Start-up and settings
4 Start-up and settings
Before start-up of the control loop, check all
devices to make sure that they are connected
correctly, do not leak and function properly.
Release the lock (4) and open the indicating
unit (5) to access the operating controls on
the controller.
Check the turnboard to make sure the correct
direction of action is set at the controller (see
section3.1.1).
4.1 Tuning the controller
The controller needs to be tuned to the
characteristics of the controlled system using
the Kp and Tn and/or Tv adjusters at the
controller module (Fig.1). This ensures that
the controller can maintain any system
deviations for all set points caused by the
disturbance variables to zero or at least
minimize them.
The system must be started up manually
when a controller station is tted with a
manual/automatic switch (1.6).
In most cases, a tuning test following the
Ziegler and Nichols method is sufcient to
tune the controller:
1. Apply supply air (1.4±0.1bar).
2. Set the proportional-action coefcient Kp
to a low value at the comparator.
3. Set the Tn restrictor to its maximum value
and Tv to its lowest value (PI and PID
controllers only).
1.6
1.7
1.5
1.8
1.4
1.3
5
4
Fig.3: Front view
Setting for manual mode:
4. Set manual/automatic switch to manual.
5. Move the adjuster (1.7) for the control
signal until the controlled variable (con-
trolled variable pointer, 1.3) slowly starts
to settle to the adjusted set point (set
point adjuster, 1.4).
After the differential pressure indicator
(1.8) reads zero, set the switch (1.6) to
automatic.
Proceed as described in steps 6 to 7.
Setting for automatic mode:
4. Turn the adjuster (1.4) on the indicating
unit to set the set point to the required
value.
1.3 Controlled variable pointer (red)
1.4 Set point adjuster (green)
1.5 Output pressure display
1.6 Manual/automatic switch
1.7 Manual output pressure adjuster
1.8 Differential pressure indicator
4 Lock
5 Indicating unit

EB 7030 EN 11
Start-up and settings
5. Briey set the Tn restrictor to its minimum
setting (fully open) to allow the red con-
trolled variable pointer to move to the
green set point pointer. Close the Tn re-
strictor again.
6. Starting from a low value, increase the
proportional-action coefcient Kp until
the controlled variable pointer shows an
harmonic oscillation pattern of the con-
trolled variable (uniform oscillation am-
plitudes as shown in Fig.4).
If oscillations do not arise with a large
Kp setting, turn the rotary knob to slight-
ly change the set point and then return it
to its former setting. It may be necessary
to increase the gain (Kp) slightly until an
harmonic oscillation pattern arises.
7. Write down the adjusted value on the Kp
scale you have just adjusted as the criti-
cal proportional-action coefcient Kpcrit.
Use a stopwatch to time the oscillation
time for one entire oscillation to nd Tcrit
(PI and PID controllers only).
Fig.4: Harmonic oscillation, tuning
Multiply both values with the values in the ta-
ble (Fig.4) and set them as the favorable
settings for Kp, Tn and Tv at the controller.
Should oscillations still occur despite these
settings, slightly reduce Kp and increase Tn.
Repeat these steps, if necessary, until the
control loop shows a satisfactory perfor-
mance.
Leave enough time in between settings to al-
low the controller to stabilize.
4.2 Adjusting the operating
point in P and PD control-
lers
Type3433 Controller Modules only
For P and PD controllers, after setting the
proportional-action coefcient Kp, set the
operating point instead of the reset time as
described above.
When the system is in a steady-state condi-
tion, read the automatic output yA of the con-
troller at the display (1.5) and set this value
directly at the operating point adjuster (12,
Fig.1) (setting values 0.2 to 1bar=0 to
100%).
Continue to correct until the system deviation
is zero. If the output pressure reading is un-
steady, nd the average value.
After the set point is changed, the operating
point must set again as described above.
When the set point is often changed, adjust
the operating point to 0.6bar (e.g. 50%,
average value).
Kp Tn Tv
P 0.50·Kpcrit
PI 0.45·Kpcrit 0.85·Tcrit
PID 0.59·Kpcrit 0.50·Tcrit 0.12·Tcrit
Controlled
variable
(actual value)
T
crit
Tcrit
–
+
Note

12 EB 7030 EN
Start-up and settings
If a P/PI controller is switched to P action,
completely open the Tn restrictor to ensure
the operating point adjuster can take effect
without delay.
Version with set-point-dependent operating
point
This version does not need to be adjusted
since the operating point automatically fol-
lows the set point w.
4.3 Bumpless automatic/
manual mode changeover
The bumpless switchover ensures that no
pressure surges can reach the valve when
the manual/automatic switch is activated as
follows:
Changeover from automatic to manual
Use the adjuster (1.7) to adjust the manual
output yH until the differential pressure indi-
cator (1.8) reads zero. Change the switch
over to manual.
Differential pressure indicator
With Without deviation
Changeover from manual to automatic
If the system is to be controlled manually to
the required value, the automatic output yA
must be adjusted at the set point adjuster
(1.4) to match the manual output yH.
Do not set the switch (1.6) to automatic until
the differential pressure indicator (1.8) reads
zero.
Afterwards, adjust the set point again to the
required value.
4.4 Bumpless changeover be-
tween internal or external
set point
For xed set point and follow-up control
modes, the Type3432 Controller Station is
tted with a wint/wext selector switch, a pres-
sure adjuster and a differential pressure indi-
cator (Fig.12).
For bumpless changeover betwen set points,
adjust the the pressure adjuster until the dif-
ferential pressure indicator moves to zero.
4.5 Recalibrating the controller
zero point
If deviations arise between the controlled
variable and set point during operation, the
zero point can be recalibrated by turning the
zero screw on the back of the indicating unit
(5) until the controlled variable and set point
on the front display are the same again.
Deviations between the set point and the
controlled variable can also be corrected at
the zero adjuster (8, Fig.1) of the controller
module.
Note

EB 7030 EN 13
Design and principle of operation
5 Design and principle of
operation
The modular controllers represent a complete
automation package consisting of a control-
ler station, a controller module suitable for
the respective task, and, possibly, a transmit-
ter module as well as other additional equip-
ment.
Indicating controllers with Type3432 Con-
troller Station are designed for installation of
Type3435 and Type3436 Transmitter Mod-
ules for pressure or Type3438 Transmitter
Module for temperature with direct process
uid connection.
The Type3431 Controller Station receives
the controlled variable as a standardized
signal from 0.2 to 1bar or 3 to 15psi. A
current signal from 0/4 to 20mA or 1 to
5mA can also be supplied by an optional
installed i/p converter.
The controller station can be tted with a
Type3433 or Type3434 Controller Module.
The Type3433 Controller Module can be
combined with Type3437 Additional Mod-
ules 1) for pressure limitation, control mode
changeover or bumpless manual/automatic
switchover for special control tasks.
The controller station can optionally be
equipped with a manual/automatic switcho-
ver, which consists of a selector switch, an
adjuster for manual mode and a differential
pressure indicator.
For use as combined xed set point and fol-
lower controller, the controller station is tted
with an additional unit for wint/wext switcho-
ver; for use as a follower controller with an
additional pneumatic or electric input for ex-
ternal set point wext (e.g. 0.2 to 1bar or 0/4
to 20mA).
Additionally, one or two inductive limit con-
tacts can be mounted on the indicating unit,
which can be adjusted on a scale.
More details concerning the controller sta-
tions and the associated controller modules
can be found in the corresponding data
sheets.
uT7030·Overview of pneumatic indicat-
ing controllers
uT7032·Pneumatic indicating controllers
for pressure
uT7034·Pneumatic indicating controllers
for temperature with capillary sensor
uT7036·Pneumatic indicating controllers
for Pt100 resistance thermometer
uT7038·Pneumatic indicating controllers
for standardized signals
uT7040·Type3433 Pneumatic Controller
Modules and Type3437 Additional Modules
uT7041·Type3434 Pneumatic Controller
Modules
uT7045·Type6112 i/p Converter
Modules
Note
1) No longer available.

14 EB 7030 EN
Design and principle of operation
5.1 Transmitter modules
Type3435 for pressure
The pressure p of the process medium is fed
to the transmitter module (2) where it creates
a movement at the bourdon tube measuring
system (2.1). The servo system (2.2) converts
this movement into a pneumatic signal (con-
trolled variable x), which is proportional to
the pressure p. This signal is fed to the bel-
lows measuring system of the controlled vari-
able display (1.3) and the controller module
(3).
Type3436 for temperature with capillary
sensor
The temperature of the process medium pro-
duces a pressure proportional to the tem-
perature in the gas-lled sensor (2.3) of the
transmitter module. This pressure opposes a
force at the beam (2.4) which is generated
at the feedback bellows (2.6) by the output
pressure pA.
The supply air ows through the restrictor
(2.9) and nozzle (2.8) onto the apper plate
(2.7). An increase in temperature causes the
apper plate to come closer to the nozzle.
As a result, the output pressure pA applied to
the bellows (2.6) rises until a new equilibri-
um is reached, i.e. until the output signal
reaches a value proportional to the tempera-
ture. The pneumatic standardized signal
(controlled variable x) is fed to the bellows
measuring system of the controlled variable
display (1.3) and the controller module (3).
Type3438 for temperature with Pt100
resistance thermometer
The Type3438 Transmitter Module consists
of an electric transmitter and a downstream
i/p converter for connection to a Pt100
resistance thermometer. The resistance value
of the Pt100 sensor is converted into a 4 to
20mA current signal in the electric
transmitter. Its output signal (4 to 20mA) is
converted into a pneumatic signal (0.2 to
1bar) by the i/p converter. The output
pressure proportional to the temperature is
applied as a pneumatic signal (controlled
variable x) to the bellows measuring system
of the controlled variable display and
controller module.

EB 7030 EN 15
Design and principle of operation
Type3432 with Type3435 Pneumatic Transmitter
for pressure
Type3432 with Type3436 Transmitter for
temperature
Type3431 and Type 3432 for pneumatic
standardized signals
Type3432 with manual/automatic switch (1.6),
supply pressure regulator (1.9) and i/p converter
(4)
Fig.5: Functional drawings of the indicating controllers
1.5
yw
yww
Zx
1.2 1.4 1.3 3
PI
P
P PI
PID
/
PI
P
P PI
PID
/
PI
P
P PI
PID
/
w
1.8
yH
S
yH
yAxwx
wxwx
w
P
B
Z
Z
y
y
Zy
x
x
1.21.41 1.4 1.3 3
R
w
z
yA
S
x
R
w
z
yA
S
x
R
w
z
yA
S
x
R
w
z
yA
S
x
PI
P
P PI
PID
/
1.6
1.5
1.7
4
1.9
1.5 31.2
2.2 2.3 2.9 2.8
1.4 1.31.41 1.5 31.2 1.4 1.31.41
2.1
1
1
1
1
2.7
2.4
2.6
2
1 Controller station
1.2 Scale
1.3 Controlled variable display with
pointer, gear mechanism and
bellows measuring system
1.4 Set point adjuster with pointer,
gear mechanism and set point
calibrator
1.5 Output pressure display
1.6 Manual/automatic switch
1.7 Adjuster for manual mode
1.8 Differential pressure indicator for
bumpless man/auto switchover
1.9 Supply pressure regulator
2Transmitter module
2.1 Bourdon tube measuring system
2.2 Pneumatic servo system
2.3 Temperature sensor
2.4 Balance beam
2.6 Feedback bellows
2.7 Flapper plate
2.8 Nozzle
2.9 Restrictor
3 Controller module
4 Type6112 i/p Converter
Supply 1.4bar
pAOutput pressure
pBCompressed air network

16 EB 7030 EN
Design and principle of operation
5.2 Controller station
The controlled variable signal x produces a
deection on the bellows measuring system
of the controlled variable display (1.3) which
is transmitted to the pointer over a gear
mechanism.
The set point w can be adjusted at the scale
(1.2) on the front. The position of the set
point adjuster (1.4) is transmitted to the set
point calibrator over a gear mechanism.
This servo system (1.41) converts the adjust-
ed set point into a pneumatic set point signal
(w), which is fed to the controller module.
The controller module compares the con-
trolled variable signal and the set point sig-
nal (x and w) and produces an output signal
yA based on the system deviation and the
adjusted control parameters. The output sig-
nal is connected to the output pressure dis-
play (1.5) and output port y.
The controller station with manual/automatic
switchover (Fig.1 and Fig.3) additionally
contains a manual/automatic switch (1.6),
adjuster for manual mode (1.7) and differ-
ential pressure indicator (1.8).
When the switch is positioned in the AUTO-
MATIC mode, the output pressure display
(1.5) and output port y are connected to the
automatic output signal yA. In MANUAL
mode, the output pressure display and out-
put port y are connected to the manual out-
put signal yH set at the adjuster (1.7).
A bumpless switchover from manual to auto-
matic mode is possible when yAand yHare
the equal each other on the differential pres-
sure indicator (1.8).
5.3 Controller modules
The controller modules are plug-in units.
They are plugged into the self-sealing sockets
of the controller station and held by a fasten-
ing screw.
5.3.1 Type3433 Controller
Modules
The controller modules consist of a compara-
tor tted with four metal bellows arranged in
a square and a base plate with self-seal
push-on ttings. The base plate accommo-
dates the components required for the cho-
sen function, such as relays and restrictors.
The components can be exchanged or up-
graded, allowing the function to be changed
at a later point in time (see section9.1).
Type3433-2 PI Controller (Fig.6, top)
The controlled variable x and the set point w
are transferred as pneumatic signals be-
tween 0.2 and 1bar via turnboard A to the
metal bellows w and x. When x is greater
than w, the controlled variable bellows tilts
the pivoted swashplate toward the set point
bellows, causing the pressure downstream of
the nozzle connected to the swashplate over
a pin to rise. As a result, the output pressure
yA of the booster increases.
The output pressure is fed back via turn-
board B to the bellows R2 onto the swash-
plate.
The position of the swashplate and the out-
put pressure continue to change until the dis-
tance between nozzle and apper plate is
the same as initially and the output pressure

EB 7030 EN 17
Design and principle of operation
yA assumes a value corresponding to the
controlled variable x and the adjusted pro-
portional-action coefcient Kp adjustable
over a screw.
Outside of the controller module, the yAis
connected to R, allowing the output pressure
yA to be fed back to bellows R1 also over the
port R and the adjustable Tn restrictor. As a
result, the effects of the pressures in bellows
R1 and R2 balance themselves out and the
system deviation is eliminated.
If, after switchover to manual mode at the
controller station, a switching pressure is ap-
plied to port S, the Tn start-up relay is acti-
vated and bypasses the Tn restrictor.
The turnboard A determines the direction of
action of the controller. The direction of ac-
tion is changed by turning the turnboard.
See section3.1.1.
The turnboard B determines the air delivery
to the feedback bellows.
In the delivered state, the turnboard B is set
to yA, i.e. the output pressure yA is directly
fed back to bellows R2. With this circuit ar-
rangement, the controller provides normal
air delivery and output pressure damping.
In the switching position to R, the output
pressure yA is fed back via port R to the bel-
lows R1 and R2. As a result, the controller
has a higher air delivery.
Practical application for long distances to the
control valve, large connecting volumes and
for fast controlled systems.
See section3.1.2 on how to set or change
the air delivery by turning the turnboard B.

18 EB 7030 EN
Design and principle of operation
R Feedback
R1/R2 Feedback bellows
Z=Supply air
1.4bar
YA Output pressure
SSwitching pressure
Turnboards
A Direction of action
B Air output capacity
Fig.6: Type3433 Controller Modules
Type3433-2 PI Controller Module
The following controller module versions are
almost identical to the Type3433-2 PI Con-
troller Module, except they are tted with, for
example an operating point adjuster, a de-
rivative element or a selector switch, de-
pending on the application.
Type3433-1 P Controller Module
This module is largely identical to the
Type3433-2, except an operating point ad-
juster is used instead of the integral element.
Type3433-3 PID Controller Module
This module is largely identical to the
Type3433-2. However, it contains an addi-
tional derivative element providing a deriva-
tive-action gain of approx. ten times in the
input branch of the controlled variable x. The
derivative-action time can be adjusted at the
Tv restrictor.

EB 7030 EN 19
Design and principle of operation
Type3433-4 PD Controller Module
This module is largely identical to the
Type3433-1. However, it contains a deriva-
tive element providing a rate gain of the in-
put branch of the controlled variable x. It has
a derivative-action gain of approx. ten times
and a derivative-action time that can be ad-
justed at the Tv restrictor.
Type3433-5 P/PI Controller Module
With P/PI selector switch, it can be used ei-
ther as P controller with operating point set-
ting or PI controller.
This module is designed in the same way as
the PI and P controller modules.
The Type3433-6 PD/PID Controller Module
with PD/PID selector switch can be used ei-
ther as PD or PID controller.
Type3433-9 P Controller Module
With set point-dependent operating point, it
is the same as Type3433-1 P Controller
Module, except the operating point changes
proportionally to the set point w.
R Feedback
R1/R2 Feedback bellows
Z=Supply air
1.4bar
YA Output pressure
SSwitching pressure
Turnboards
A Direction of action
B Air output capacity
Fig.7: Type3433 Controller Modules

20 EB 7030 EN
Design and principle of operation
The pressures acting in the diaphragm cham-
bers R1 and R2 equal each other.
The position of the force switch changes until
the controller output pressure assumes a val-
ue assigned to the controlled variable x and
the adjusted proportional-action coefcient
Kp, i.e. until the system deviation is eliminat-
ed.
The proportional-action coefcient Kp is ad-
justed at the restrictor (9), while the reset
time Tn is adjusted at the restrictor (10). The
zero adjuster (8) is used to calibrate the con-
troller module.
The turnboard A determines the direction of
action of the controller. The direction of ac-
tion is changed by turning the turnboard.
See section3.1.1.
5.3.2 Type3434 Controller
Module
The controller modules feature a box-shaped
comparator that operates according to the
force-balance method. The proportional-ac-
tion coefcient Kp can be adjusted at a re-
strictor within the range between 1 and 25.
Type3434-2 PI Controller Module (Fig.8)
The controlled variable x and the set point w
are transferred as gauge pressures between
0.2 and 1bar or 3 to 15psi via turnboard
A to the diaphragm chambers (R1 and R2).
When x exceeds w, the force switch (23) is
lowered and opens the plug.
The supply air ows into diaphragm cham-
ber R2 and the output pressure yA increases.
The output pressure is routed over the Tn
restrictor (10) into the volume of the 1:1
booster (24), whose output pressure is fed
back into the diaphragm chamber R1.
R
24
w
Z
yA
Kp
Tn
S
A
x
9 8
R1
10
21
R2
23
Fig.8: Type3434-2 Controller Module
8 Zero adjuster
9Kp adjuster
10 Tn adjuster
21 Diaphragm
23 Force switch
24 Booster
R1 Diaphragm chamber R1
R2 Diaphragm chamber R2
ADirection of action of
turnboard