Samson 4763 Service manual

Electropneumatic Positioner
Type 4763
Fig. 1 · Type 4763
Mounting and
Operating Instructions
EB 8359-2 EN
Edition April 2008

Contents
1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 6
2 Attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Attachment to valves with cast yokes. . . . . . . . . . . . . . . . . . . 8
2.2 Attachment to valves with rod-type yokes . . . . . . . . . . . . . . . . 9
2.3 Cover of the positioner case. . . . . . . . . . . . . . . . . . . . . . . 9
3 Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Pneumatic connections . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.1 Pressure gauges. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.2 Supply pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Combining positioner and actuator . . . . . . . . . . . . . . . . . . 12
4.1.1 Determining/reversing the operating direction . . . . . . . . . . . . . 12
4.2 Starting point and input signal (reference variable) . . . . . . . . . . . 14
4.3 Setting the positioner at the valve . . . . . . . . . . . . . . . . . . . 15
4.3.1 Setting the air delivery (volume restriction Q) and proportional band XP.15
4.3.2 Setting actuator version “Stem extends” . . . . . . . . . . . . . . . . 16
4.3.3 Setting actuator version “Stem retracts”. . . . . . . . . . . . . . . . . 16
4.4 Exchanging the range spring . . . . . . . . . . . . . . . . . . . . . 17
5 Conversion from electropneumatic to pneumatic positioner. . . . . . . 18
6 Servicing explosion-protected devices . . . . . . . . . . . . . . . . . 19
7 Accessories and mounting parts . . . . . . . . . . . . . . . . . . . . 19
8 Dimensions in mm . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2EB 8359-2 EN
Contents

EB 8359-2 EN 3
Safety instructions
4
Assembly, start-up and operation of the device may only be performed by
trained and experienced personnel familiar with this product.
According to these mounting and operating instructions, trained personnel is
referred to as 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 relevant stan-
dards.
4
Explosion-protected versions of this device may only be operated by person-
nel who have undergone special training or instructions or who are autho-
rized to work on explosion-protected devices in hazardous areas.
4
Any hazards which could be caused by the process medium, the signal
pressure and moving parts of the control valve are to be prevented by
means of the appropriate measures.
4
If inadmissible motions or forces are produced in the actuator as a result of
the level of the supply air pressure, this must be restricted by means of a
suitable pressure reducing station.
4
Proper shipping and appropriate storage are assumed.
4
Note! The device with a CE marking fulfils the requirements of the Directives
94/9/EC (ATEX) and 89/336/EEC (EMC).
The declaration of conformity can be viewed and downloaded on the
Internet at http://www.samson.de.

4EB 8359-2 EN
Versions
Electropneumatic Positioner Type 4763- x 1x00x x xx0x0xx0
Explosion protection
Without 0 2/7
II 2 G EEx ia IIC T6 acc. to ATEX 1
CSA/FM intrinsically safe/non incendive 3
II 3 G EEx nA II T6 for Zone 2 acc. to ATEX 8 2/7
Range spring
Spring 1, travel = 15 mm 1
Spring 2, travel = 30 mm, split-range 15 mm 2
Spring 3, travel = 60 mm, split-range 30 mm 3
Pneumatic connection
ISO 228/1 G ¼ 1
¼-18 NPT 3
Electrical connection
Cable gland
M20 x 1.5 blue (plastic) 1
M20 x 1.5 black (plastic) 2
M20 x 1.5 (nickel-plated brass) 72
i/p module
Type 6109 1
Type 6112 2
Reference variable
4 … 20 mA 0
0 … 20 mA 22
1 … 5 mA 23
Temperature range
Standard 0
Low temperature down to –45 °C 22
Special version
Without 000
For oxygen 0/1 0 1 6
II 3 D IP 54 T 80 °C (with manufacturer’s
declaration) 8 2/7 0 1 8

EB 8359-2 EN 5
Technical data
Controlled variable (travel) 7.5 to 60 mm, with 90 mm lever extension
Reference variable
Split-range 0 to 50 %
or 50 to 100 %
Reference variable span
(up to 50 mm travel)
4 to 20 mA Ex Internal resistance Riat 20 °C approx. 250 Ω±7%
4 to 20 mA not Ex Internal resistance Riat 20 °C approx. 200 Ω±7%
0 to 20 mA Internal resistance Riat 20 °C approx. 200 Ω±7%
1 to 5 mA Internal resistance Riat 20 °C approx. 880 Ω±7%
The data specified in the Certificate of Conformity must be taken into
consideration for devices with type of protection EEx II C.
Range spring See table on page 14 for selection
Supply air 1.4 to 6 bar (20 to 90 psi)
Air quality as per ISO 8573-1: Max. particle size and density: Class 4
Oil contents: Class 3, Pressure dew point: Class 3
Signal pressure pst (output) Max. 0 to 6.0 bar (0 to 90 psi)
Characteristic Linear characteristic
Deviation from terminal-based conformity: ≤1.5 %
Hysteresis < 0.5 %
Sensitivity < 0.1 %
Operating direction Reversible
Proportional band XPat
1.4 bar supply air 1 to 3 % with spring 1 and 2 1 to 1.5 % with spring 3
Air consumption in
steady state XP= 1 % With 1.4 bar supply air: 0.19 mn³/h With 6 bar supply air: 0.5 mn³/h
Air delivery At Δp 1.4 bar: 3.0 mn³/h At Δp 6 bar: 8.5 mn³/h
Transit time with Type 3271
Actuator, stem extends 240 cm² ≤1.8 s · 350 cm² ≤2.5 s · 700 cm² ≤10 s
Permissible
ambient temperature –20 to 70 °C –35 to 70 °C for devices with metal cable entry
–45 to 70 °C special version
Version with oxygen as operating medium up to max. 60 °C
Specifications in Certificate of Conformity additionally apply for Ex devices
Influences Temperature: < 0.03 %/1 K
Supply air: < 0.3 %/0.1 bar
Vibration: < 2 % between 10 to 150 Hz and 4 g
Effect when turned by 180°: < 3.5 %
Degree of protection IP 54, special version: IP 65
Weight Approx. 1.2 kg
Materials Case: Die-cast aluminum, chromated and plastic-coated
External parts: Stainless steel

1 Design and principle of
operation
The electropneumatic positioner is used for
the correlation between the valve stem posi-
tion (controlled variable x) and the input sig-
nal (reference variable w) received from the
controller. In this case, the input signal ac-
cepted from the control device is compared
to the travel (valve stem position) of the con-
trol valve, and a pneumatic signal pressure
(output variable y) is delivered.
The positioner consists of an i/p converter
unit (21) and the pneumatic section includ-
ing the lever (1), shaft (1.1) and range
spring (6), plus the control system compos-
ing nozzle, flapper and booster. The input
signal (e.g. 4 to 20 mA) is directly fed to the
i/p converter unit and converted to a pro-
portional air pressure signal pe. Any change
of the input current signal causes a propor-
tional change of the air pressure pesent to
the pneumatic control system.
The air pressure pe, in turn, produces a
force which acts on the surface of the mea-
suring diaphragm (8) and is compared to
the force of the range spring (6). The motion
of the diaphragm (8) is transferred to the
flapper (10.2) via the feeler pin (9.1), and
the nozzle (10.1) releases pressure. Any
change of either the air pressure peor the
valve stem position causes the pressure to
change in the booster (12) connected down-
stream of the nozzle. The signal pressure pst
which is released causes the plug stem to as-
sume a position based on the input signal.
The adjustable volume restriction Q (14)
and Xp (gain) restriction (13) are used to
optimize the control loop. The range spring
(6), which can be exchanged, is assigned to
both the rated valve travel and the nominal
voltage of the input signal.
6EB 8359-2 EN
Design and principle of operation
4
21 14 13 10.2 7
1
15
8
5 6.1 6 3
Fig. 2 · Positioner with cover removed

EB 8359-2 EN 7
Design and principle of operation
pst
Output
36
pe
Supply
9
21
1.1
4
5
6
8
9
9.1
10.2
10
10.1 6
8
9
9.1
10.2
10.1
10
11
iip
12
14
13
1 2 2.1 20
Fig. 3 · Functional diagram
Legends for Figs. 2 and 3
1 Lever for valve travel
1.1 Shaft
2 Pin
2.1 Nut
3 Sleeve
4 Zero adjustment screw
5 Mounting screw
6 Range spring
6.1 Bracket
7 Mounting screw
8 Measuring diaphragm
9 Diaphragm plate
9.1 Feeler pin
10 Nozzle block
10.1 Nozzle
10.2 Flapper
11 Cover plate
12 Booster
13 XPrestriction
14 Volume restriction Q
15 Borehole for mounting screw
20 Plate
21 i/p converter unit
Arrangement of nozzle/flapper for
reverse <> operating direction
Travel

2 Attachment
To attach the positioner to valves with cast
yokes, mounting parts (order no.
1400-5745) are used. For valves with
rod-type yokes (pillars), the mounting kit (or-
der no. 1400-5745) and additionally the
mounting kit (order no. 1400-5342) are
necessary (see also accessories table on
page 19).
Since the positioner can be attached on ei-
ther side of the valve, the physical location
(left or right attachment) should be deter-
mined before actual attachment (see corre-
sponding Figs. 7 to 10 in section 4.1).
2.1 Attachment to valves with
cast yokes
1. Fasten the plate (20) to the stem connec-
tor clamps (22) of the valve using the
screws (21).
2. Unscrew the positioner cover, and secure
the device to the valve yoke using the
mounting screw (15). Make sure that the
pin (2) is led inside the wire strap and
therefore clamped against the plate (20).
8EB 8359-2 EN
Attachment
15 1 20 2 2.1 21 22 23
Fig. 4 · Attachment to valves with cast yokes (NAMUR rib)
Legends for Figs. 4 and 5:
1 Lever
2 Pin
2.1 Nut
15 Mounting screw
20 Plate
21 Screw
22 Stem connector
23 Plug stem
24 Travel indicator
26 Clamping plate
27 Valve pillars
28 Support

2.2 Attachment to valves with
rod-type yokes
1. Screw the plate (20), off-centered, to the
travel indicator (24) of the plug stem (23)
using the screws (21).
2. Place both the support (28) and the
clamping plate (26) on the pillar (27)
and lightly fasten. Move the support until
both the center of the plate (20) and the
support (28) are aligned at half the valve
travel.
3. Screw tight the support and clamping
plate.
4. Mount the positioner to the support using
the mounting screw (15). Make sure that
the pin (2) is led inside the wire strap
and therefore clamped against the plate
(20).
2.3 Cover of the positioner case
After attaching the positioner, make sure
that the vent plug on the cover of the
positioner case points downwards after the
valve has been installed.
EB 8359-2 EN 9
Attachment
151282726202.12 212423
Fig. 5 · Attachment to valves with rod-type yokes

3 Connections
3.1 Electrical connections
For electrical installation, you are re-
quired to observe the relevant
electrotechnical regulations and the
accident prevention regulations that
apply in the country of use. In Ger-
many, these are the VDE regulations
and the accident prevention regula-
tions of the employers' liability insur-
ance association.
The following standards apply for in-
stallation in hazardous areas:
EN 60079-14: 2003 (VDE 0165
Part 1) "Electrical apparatus for ex-
plosive gas atmospheres" and
EN 50281-1-2: 1999 (VDE 0165
Part 2) "Electrical apparatus for use
in the presence of combustible dust".
For the interconnection of intrinsically
safe electrical equipment, the permis-
sible maximum values specified in the
EC type examination certificate apply
(Uior U0; Iior I0; Pior P0; Cior C0,
and Lior L0).
Note for Zone 2 and Zone 22 equip-
ment :
For EEx nA equipment (non-sparking
apparatus), the standard EN 50021:
1999 specifies that connecting, inter-
rupting, or switching circuits while en-
ergized is only allowed during instal-
lation, maintenance or repair work.
For EEx nL equipment (energy-limited
apparatus), the standard EN 50021:
1999 allows this type of equipment to
be switched under normal operating
conditions.
Caution!
The terminal assignment specified in the cer-
tificate must be adhered to. Reversing the
assignment of the electrical terminals may
cause the explosion protection to become in-
effective!
Do not tamper with enameled screws inside
or on the housing.
Note on the selection of cables and wires:
To install intrinsically safe circuits, observe
section 12 of the standard EN 60079-14:
2003 (VDE 0165 Part 1). To run multi-core
cables or lines with more than one intrinsi-
cally safe circuit, section 12.2.2.7 of this
standard applies.
An additional cable gland can be installed
when connecting the device over two sepa-
rate cables. Cable entries left unused must
be sealed with blanking plugs. Devices used
at ambient temperatures down to –40 °C
must have metal cable entries.
10 EB 8359-2 EN
Connections
Fig. 6 · Electrical connection
Input
Control signal
4 (0) to 20 mA

The wiring for the input signal is led using
cable glands to the terminals 11 (+) and 12
(–). The ground connection can be con-
nected inside or outside of the positioner
case.
The following accessories are available:
Cable gland M 20 x 1.5
Black Order no. 1400-6985
Blue Order no. 1400-6986
Adapter M 20 x 1.5 to ½ NPT:
Aluminum, powder-coated
Order no. 0310-2149
3.2 Pneumatic connections
The pneumatic connections are designed as
tapped holes with ¼ NPT or ISO 2228/1-
G ¼ thread. The conventional male connec-
tions for metal and copper pipes (or plastic
hoses) can be used.
Note!
The supply air must be dry and free of any
oil and dust. Always observe the mainte-
nance instructions applicable to the con-
nected pressure reducing stations. Blow out
air lines thoroughly before connecting them.
3.2.1Pressure gauges
We recommend attaching pressure gauges
for the supply air and signal pressure in or-
der to monitor the positioner. The parts are
listed as accessories in the table on
page 19.
3.2.2Supply pressure
The required supply pressure is determined
by the bench range and the operating direc-
tion (fail-safe action) of the actuator. The
bench range is written on the nameplate as
spring range or signal pressure range de-
pending on the type of actuator. FA (actua-
tor stem extends) or FE (actuator stem re-
tracts) or a symbol indicates the operating
direction.
Actuator stem extends (FA)
Fail-safe position "Valve CLOSED"
(for globe and angle valves)
Required supply pressure =
Upper bench range value + 0.2 bar,
minimum 1.4 bar.
Actuator stem retracts (FE)
Fail-safe position "Valve OPEN"
(for globe and angle valves)
The required supply pressure for a
tight-closing valve is roughly estimated from
the maximum signal pressure pstmax:
pstmax = F + dp
A
2
4
⋅⋅
⋅
πΔ [bar]
d = Seat diameter [cm]
Δp = Differential pressure at the valve [bar]
A = Actuator diaphragm area [cm2]
F = Upper range value of the actuator
In the absence of such specifications, pro-
ceed as follows:
Required supply pressure =
Upper bench range value + 1 bar
The positioner output pressure is led to the
top or bottom diaphragm case of the actua-
tor as shown in Figs. 7 to 10.
EB 8359-2 EN 11
Connections

4 Operation
4.1 Combining positioner and
actuator
The arrangement of the actuator, input sig-
nal, operating direction and mounting loca-
tion is schematically represented in Figs. 7
to 10.
Each subsequent change such as reversal of
the control loop's operating direction or
field reversing the actuator version from di-
rect "Actuator stem extends" to reverse "Ac-
tuator stem retracts" or vice versa also in-
volves changing the mounting location of the
positioner.
4.1.1Determining/reversing the
operating direction
(Figs. 7 to 11)
When the input signal (reference variable
w) increases, the signal pressure pst can ei-
ther be increasing (direct operating direc-
tion <<) or decreasing (reverse operating di-
rection <>).
The same applies to a decreasing input sig-
nal; the output pressure either decreases (di-
rect operating direction <<) or increases (re-
verse operating direction <>).
Symbols are located on the flapper (10.2)
which identify the respective operating di-
rections (direct << or reverse <>).
Depending on the flapper position, the ad-
justed operating direction is marked with the
corresponding symbol. If the operating di-
rection of the required function does not
match the symbol or if the operating direc-
tion is to be changed, proceed as follows:
1. Remove both screws of the cover plate,
and lift off the nozzle block (10) along
with the cover plate.
2. Reinstall the nozzle block turned 180° to-
gether with the cover plate, and screw
tight.
Make sure that the nozzle block and
flapper are correctly located above or
below the feeler pin (9.1) as shown in
Fig. 11.
If the operating direction is to be changed
after the initially determined arrangement of
positioner and actuator, note that the
positioner must be mounted in a different lo-
cation and the nozzle block must be turned.
Always consider the location of the lever (1)
and the plate (20), "lever on top of plate" or
reversed "plate on top of lever" as shown in
Figs. 7 to 10.
12 EB 8359-2 EN
Operation

EB 8359-2 EN 13
Operation
Actuator: Stem extends (FA)
Actuator: Stem retracts (FE)
Fig. 7 · Operating direction << Left attachment Fig. 8 · Operating direction <> Right attachment
Fig. 9 · Operating direction << Right attachment Fig. 10 · Operating direction <> Left attachment
Fig. 11 · Position of nozzle block, cover plate removed
Feeler pin
Nozzle block
Cover plate
Marking Flapper
Operating direction increasing/increasing (direct <<)
feeler pin on top of flapper Op. direction increasing/decreasing (reverse <>) flapper on top of feeler pin
Lever (1) on top of plate (20) Plate (20) on top of lever (1)
Range spring

4.2 Starting point and input
signal (reference variable)
The attached lever and the installed range
spring of the positioner are assigned to the
values of rated valve travel (mm) and the in-
put signal (% reference variable) as in the
table below.
In standard operation, the reference vari-
able span is 100 % = 16 mA. A smaller
span of, for example, 50 % = 8 mA is only
required for split-range operation (Fig. 13).
The span can be changed by exchanging
the range spring (section 4.4). On making
adjustments to the positioner, the travel must
be adapted to the input signal and vice
versa.
14 EB 8359-2 EN
Operation
Rated travel [mm] Min./max. travel
[mm] Reference variable (input signal) Range spring
Standard travels for SAMSON valves with lever l (40 to 127 mm long)
15 7.5 to 15 100 %
50 % 1 2
30 14 to 32 100 %
50 % 2 3
60 30 to 70 100 % 3
Additional travel ranges with lever l and lever extension (40 to 200 mm long)
20 7.5 to 26 100 %
50 % 1 2
40 14 to 50 100 %
50 % 2 3
> 60 30 to 90 100 % 3
100%
0% 4 20mA
Fig. 12 · Standard operation
Reference variable
Input signal
Open
Travel
Closed
100%
0% 4 12 20mA
Fig. 13 · Split-range operation, two valves operating in
opposing directions
Dead band
Valve 1
Valve 2
Open
Travel
Closed

With a 4 to 20 mA input signal, for exam-
ple, the valve must also move through the
entire range (0 to 100 % ). The starting
point then is 4 mA and the upper range
value 20 mA.
In split-range operation, the controller out-
put signal used to control two control valves
is divided in such a way that these valves
move through their entire travel with half of
the input signal range (e.g. first valve set to
4 to 12 mA, second valve set to 12 to
20 mA). To prevent the two from overlap-
ping, a dead band of ±0.5 mA as in Fig. 13
must be taken into account.
The starting point (zero) is adjusted using
the zero adjustment screw (4), the reference
variable span and, hence, the upper range
value using the pin (2).
4.3 Setting the positioner at the
valve
4Connect an ammeter to the control signal
input at the terminals 11 (+) and 12 (–).
4Connect the supply air to the supply input
(supply 9).
4.3.1Setting the air delivery
(volume restriction Q) and
proportional band XP
1. Close the volume restriction (14) as far
as the required speed of response al-
lows.
You can check the speed of response by
pressing the range spring (6) as far as it
will go.
2. Set the input signal to approximately
50 % of its range. Then, turn the zero
adjustment screw (4) until the valve is at
approximately 50 % valve travel.
On setting the Xprestriction, observe the re-
lationship with the supply air pressure as in-
dicated in Fig. 14. The preset value of Xp
should read approximately 3 %.
3. Check the plug stem's tendency to oscil-
lation by pressing the range spring (6)
briefly as far as it will go.
Xpshould be set to a value as small as
possible, however, without causing no-
ticeable overshoot.
Note!
Always determine the Xpsetting prior to ad-
justing the starting point. Subsequent modifi-
cation displaces the zero point!
The zero can also be shifted by altering the
adjusted supply air pressure.
If necessary, check the zero adjustment un-
der operating conditions of the plant and,
re-adjust, if need be.
EB 8359-2 EN 15
Operation
Zul. Supply Alim.
Xp
[%]
5
4
3
2
1
0
6 bar 3 bar 1.4 bar
90˚ 0˚180˚270˚
270˚90˚
180˚
0˚
360˚
Fig. 14 · Setting the XPrestriction

4.3.2Setting actuator version
“Stem extends”
Note!
To ensure that the total closing force of the
actuator can be effective in the control
valve, the diaphragm chamber must be
completely vented at the lower range value
of the reference variable (operating direc-
tion <<) and at the upper range value (oper-
ating direction <>).
Therefore, set input signal to a slightly in-
creased starting point of 4.5 mA when the
operating direction is direct << and to a
slightly lowered starting point of 19.5 mA
when the operating direction is reverse <>.
This applies in particular to controllers and
control systems whose output signal is lim-
ited to a range of 4 to 20 mA.
Starting point (zero) e.g. 4.5 mA
1. Turn the zero adjustment screw (4) until
the plug stem just begins to move from
the resting position (observe plug stem
with travel indicator).
2. Reduce the input signal on the ammeter
and increase again slowly. Check
whether the plug stem starts moving at a
starting point of 4.5 mA and, if neces-
sary, correct.
Upper range value (span) e.g. 20 mA
3. After the starting point has been ad-
justed, increase the input signal. The
plug stem must be motionless at an up-
per range value of exactly 20 mA and
therefore already moved through 100 %
of its travel range (watch the travel indi-
cator at the valve!). If the upper range
value is incorrect, the pin (2) must be
moved as follows in order to correct the
signal:
4. Move pin to:
End of lever –> to increase travel
Pivot –> to reduce travel
Whenever you correct the input signal,
re-adjust zero afterwards. Subsequently,
check the upper range value.
Repeat until the two values match.
4.3.3Setting actuator version
“Stem retracts”
Note!:
For actuator version "Actuator stem re-
tracts", the diaphragm chamber must be
loaded with a pressure that is capable of
tightly closing the control valve, even with
prevailing upstream pressure in the plant.
This concerns an upper range value of the
input signal corresponding to 20 mA (direct
operating direction <<) or a lower range
value corresponding to 4 mA (reverse oper-
ating direction <>).
The required signal pressure is indicated on
the adhesive label on the positioner or is
roughly estimated as in section 3.2.2 on
page 11.
Starting point (zero) e.g. 20 mA
1. Adjust the input signal to a starting point
of 20 mA on the ammeter.
Turn the zero adjustment screw (4) until
the control valve just begins to move
from the initial position.
16 EB 8359-2 EN
Operation

2. Increase the input signal and slowly re-
duce to a starting point of 20 mA again.
Check if the valve begins to move at ex-
actly 20 mA.
Correct deviation using the zero adjust-
ment screw (4); turning it counterclock-
wise moves the control valve earlier from
its final position and clockwise later.
Upper range value (span) e.g. 4 mA
3. After adjusting the starting point, adjust
the input signal to an upper range value
of 4 mA using the ammeter. With an up-
per range value of exactly 4 mA, the
plug stem must be motionless and there-
fore already moved through 100 % of its
travel range (watch the travel indicator
at the valve!).
4. If the upper range value is incorrect, the
pin (2) must be moved to correct the sig-
nal.
Adjust 20 mA and turn the zero adjust-
ment screw (4) until the required signal
pressure is indicated on the pressure
gauge.
By way of substitution for a pressure
gauge, set 19.5 mA as the starting point.
4.4 Exchanging the range spring
If the range is to be altered or changed to
split-range operation, replace the range
spring as shown in Fig. 2 as follows:
1. Remove screw (7) on the range spring.
Pull out hexagon socket screw (5) and
the lever together with shaft.
2. Exchange range spring. Slide lever with
shaft through sleeve (3), positioner case
and bracket (6.1).
3. Secure range spring with the screw (7).
4. Move bracket and shaft until the screw
(5) sits on the flattened part of the shaft.
Tighten screw (5). Allow for a play from
0.05 to 0.15 mm between the lever (1)
and the sleeve (3) as well as between the
range spring (6) and the positioner case.
EB 8359-2 EN 17
Operation

5 Conversion from
electropneumatic to
pneumatic positioner
The appropriate conversion kit allows the
electropneumatic positioner to be converted
into a Type 4765 Pneumatic Positioner.
Note!
EB 8359-1 EN then applies for the con-
verted Type 4765 Pneumatic Positioner.
Required conversion kit for model index
.02. or lower
for G threaded connection
Order number 1400-6724
for NPT threaded connection
Order number 1400-6725
Required conversion kit for model index .03.
or higher
for G threaded connection
Order number 1400-6795
for NPT threaded connection
Order number 1400-6796
1. Undo mounting screws and lift the i/p
converter unit together with the printed
circuit board out of the positioner case.
2. Remove screw gland (1). Plug on hose
(5) and screw the connecting nipple (4)
of the conversion kit tightly on the case.
3. Insert sealing element (7) into connecting
plate (6) and screw tight in the case.
4. Push the free end of the hose onto the
connecting plate (6).
18 EB 8359-2 EN
Conversion from electropneumatic to pneumatic positioner
1324576
38
Fig. 15 · Converting the positioner
1 Screw gland
2 Printed circuit board
3 i/p module
4 Connecting nipple
5 Hose
6 Connecting plate
7 Sealing element

6 Servicing explosion-protected devices
7 Accessories and mounting parts
EB 8359-2 EN 19
Servicing explosion-protected devices
If a part of the positioner on which the ex-
plosion protection is based needs to be ser-
viced, the positioner must not be put back
into operation until an expert has inspected
the device according to explosion protection
requirements, has issued a certificate stating
this or given the device a mark of confor-
mity.
Inspection by an expert is not required if the
manufacturer performs a routine check on
the device prior to putting it back into oper-
ation. The passing of the routine check must
be documented by attaching a mark of con-
formity to the device.
Explosion-protected components may only
be replaced by original, checked compo-
nents from the manufacturer.
Devices that have already been used outside
of hazardous areas and are intended for
use in hazardous areas in future must com-
ply with the safety demands placed on re-
paired devices. Prior to operation, they must
be tested according to the specifications
stipulated for "Repairing explosion-pro-
tected devices".
Accessories – Mounting parts Order number
Range spring 1
Range spring 2
Range spring 3
Lever I
Lever extension
Pressure gauge attachment
Pressure gauge attachment, free of copper
1190-0736
1190-0737
1190-0738
1690-6469
1400-6716
1400-6950
1400-6951
Mounting kit for valves with cast yoke acc. to NAMUR
Mounting kit for valves with rod-type yokes acc. to NAMUR
for rod diameters 18 to 35 mm
1400-5745
1400-5745
and 1400-5342
Spare parts assortment with seals and diaphragms 1400-6792
Conversion kit to upgrade to degree of protection IP 65
(refer to SAMSOMATIC print Z 900-7 for more details) 1790-7408

8 Dimensions in mm
20 EB 8359-2 EN
Dimensions in mm
157
49.5
15
2.5
38
.
.
.
Useable lever length I:
40 to 127 mm
(with 40 to 200 mm
lever extension)
Pneum. connection:
ISO-228/1-G ¼
Cable gland
Model index .02 or lower: PG 13.5
Model index .03 or higher: M 20 x 1.5
Tapped hole G 18
for case with
G threaded connection
or
18NPT
for case with
NPT threaded connection