Samson 3372 User manual

Data Sheet T 8313 EN
Edition August 2016
Fig.1: Type3372 Actuator with integrated
i/p converter mounted onto
Type3321 Valve
Fig.2: Type3372 Actuator · 120cm²
actuator area · With
Type3725 Positioner (direct
attachment)
Fig.3: Type3372 Actuator · 350cm²
actuator area · With
Type3725 Positioner (direct
attachment)
Fig.4: Type3372 Actuator (120cm²) with additional
Type4744‑2 Limit Switch
The Type3372 Electropneumatic Actuator is available in the
following versions:
•Version with integrated i/p converter, 120cm² actuator
area and 15mm rated travel (Fig.1)
•Version withType3725Positioner(directattachment),
120cm²actuator area and 15mm rated travel (Fig.2)
•Version withType3725Positioner(directattachment),
350cm²actuator area and 15 or 30mm rated travel
(Fig.3)
The actuators are suitable for attachment to Series V2001
Valves (e.g. Type3321, Type3323, Type3531, Type3535)
as well as Type3214 and Type3260 Valves. The actuators
mainly consist of two diaphragm cases, a rolling diaphragm
and internal springs. The Type3372 Electropneumatic Actua-
tor is controlled by a 4 to 20mA signal. For throttling service,
an i/p converter is integrated into the actuator or a Type3725
Positioner is mounted to the rod-type yoke using a support ele-
ment.
Furtherversions
–Permissibleoperatingtemperaturesfrom–35to+90°C
Only when a positioner is mounted
–Mechanicallyadjustablelimitstop · Only when a posi-
tioner is mounted and for 120cm² actuators
–Handwheel · Only when a positioner is mounted and for
120cm² actuators
–Explosionprotection for a mounted Type3725 Positioner
II2GExiaIICT4 according to ATEX, intrinsically safe
ExiaIICT4 according to CSAGroup, 1ExiaIICT4GbX
according to GOST
Accessories
–Type4744‑2LimitSwitch (Fig.4) · With explosion protec-
tion II2GExdbIICT6-T5 and degree of protection IP66
A clamping plate can be used to mount it · See Data Sheet
uT8367
Type3372ElectropneumaticActuator
Application
Electropneumatic linear actuators for attachment to Type3214
and Type3260 Valves as well as SeriesV2001 Valves
Ratedtravel 15and30mm
Actuator area 120and350cm²

2T 8313 EN
Principleofoperation(actuatorwithintegratedi/pconverter)
The electric control signal issued by the controller as a refer-
ence variable from 4 to 20mA is transmitted to the i/p con-
verter where it is converted into a proportional pressure sig-
nal. The pressure signal creates a force that acts on the mea-
suring diaphragm. This force is then compared with the force
of the range spring. The movement of the measuring dia-
phragm is transmitted by the lever to the force switch, and -
nally a corresponding signal pressure is produced.
A change in input signal causes the actuator stem to move to
the position determined by the reference variable. The ow
rate through the valve changes accordingly.
Principleofoperation(actuatorwithmountedpositioner)
Details on principle of operation are described in the Data
Sheet uT8394 for Type3725 Positioner.
15
ip
10
10.1
11
12
13
14
i
8.
4
8.3
8.1
8.2
8.
5
8.
7
8.6
14
14
8.9
8.8
8.7
7
6
16
LegendforFig.5
6 Nut 8.6 Vent plug 12 Lever
7 Stem connector 8.7 Stopper (pressure gauge) 13 Range spring
8.1 Actuator stem 8.8 Plug connector 14 Zero adjuster
8.2 Rod-type yoke 8.9 Cover plate
(span and tight-closing function)
15 Force switch
8.3 Actuator springs 10 i/p converter 16 Rod nut
8.4 Rolling diaphragm
10.1 Potentiometer for span
8.5 Signal pressure connection
(actuator stem extends)
11 Measuring diaphragm
Fig.5: Type3372 Electropneumatic Actuator with integrated i/p converter: functional diagram (left), actuator stem retracts (top right), actuator
stem extends (bottom right)
Tight‑closingfunction
The electropneumatic actuator is completely lled with air or
vented as soon as the reference variable falls below or ex-
ceeds a certain value.
Actuatorstemextends(FA)
When the reference variable falls below the switching point of
4.08mA, the actuator is fully vented. This causes a mounted
globe valve to close. In three-way valves, port B is closed
when the valve is used for mixing service and port A is closed
when the valve is used for diverting service.
Actuatorstemretracts(FE)
When the reference variable exceeds the switching point of
19.95mA, the actuator is lled with air. This causes a mount-
ed globe valve to close. In three-way valves, port A is closed
when the valve is used for mixing service and port B is closed
when the valve is used for diverting service.

T 8313 EN 3
1
10
15
5.1
40
42
41
7
1
5
5.1
15
21
10
4
40
42
41
7
21
2
Fig.6: Type3372 Electropneumatic Actuator with 120cm² actuator area for the direct attachment of a Type3725 Positioner
1
15
27
25
20
21
4
5
10
40
42
41
7
33
60
54
2
61
Fig.7: Type3372 Electropneumatic Actuator with 350cm² actuator area for the direct attachment of a Type3725 Positioner
LegendforFig.6andFig.7
1/2 Diaphragm case 20 Hexagon bolt 41 Wiper ring
4 Diaphragm 21 Hexagon nut 42 Plain bearing
5 Diaphragm plate 25 Washer 54 Hexagon nut (for 33)
7 Actuator stem 27 Compressor 60 Plate
10 Spring 33 Rod 61 Support element
15 Collar nut 40 Radial shaft seal

4T 8313 EN
Table1: Technical data
Table1.1: Electric data for Type3372
Type3372 With integrated i/p converter WithType3725Positioner(directattachment)1)
Actuator area 120cm² 120cm² 350cm²
Rated travel 15mm 15mm 15mm 30mm
Function (mounted device) Conversion of a DC signal into a pneumatic output
signal for measuring and control tasks
Electropneumatic positioner with self-calibrating,
automatic adaptation to valve and actuator
Reference variable 4 to 20mA (reverse polarity protection) 4 to 20mA (reverse polarity protection)
Split-range operation –4 to 11.9mA and 12.1 to 20mA
Static destruction limit <–2V or >+7V ±33V
Minimum current 3.6mA 3.8mA
Load impedance ≤7V (300Ω at 20mA) Max. 6.3V
Span adjustment 25% of travel range using potentiometer Self-adjusting
Direction of action Increasing/increasing, xed Adjustable: increasing/increasing or increasing/
decreasing
Tight-closing function Stem extends: deactivation at ≤4.08mA (≤0.5%) w<1% and w>99%
Stem retracts: activation at ≥19.95mA (≥99.5%)
Operation Can be deactivated using a jumper Can be individually activated or deactivated using ca-
pacitive keys (P9 or P10)
Hysteresis ≤1% ≤0.3%
Variable position ≤7% –
Switching accuracy 0.14mA –
Air consumption in steady
state
When w= 100%:
6bar ≤200ln/h · 4bar ≤160ln/h
≤100 ln/h with a supply pressure up to 6bar and a
signal pressure of 0.6bar
Air output
capacity
To ll actuator
with air –
When Δp= 6bar: 8.5mn³/h
When Δp= 1.4bar: 3.0mn³/h
KVmax (20°C)= 0.09
To vent actuator –
When Δp= 6bar: 14.0mn³/h
When Δp= 1.4bar: 4.5mn³/h
KVmax (20°C)= 0.15
Temperature range2) –30 to +70°C –25 to +80 °C 3)
Degree of protection IP54 or IP654) IP665)
Electropneumatic or pneumatic
connection Connected inside actuator Separate from actuator (in the positioner)
Electromagnetic compatibility Requirements according to EN61000-6-2 and
EN61000-6-3
Complying with EN61000-6-2, EN61000-6-3 and
NAMUR Recommendation NE21
Display Without With
Initialization Manual Automatic
Operation Using screws Using capacitive keys
Zero calibration Without Automatic
(activated by P15 or P16)
Associated documentation uEB8313-1 uEB8313-3, uEB8394 or uT8394
1) Versions with Type3730-x or Type3731-x Positioner on request
2) Observe temperature range of mounted devices (positioner etc.).
3) Maximum –35 to +90°C with Type373x-x Positioner and metal cable glands
4) IP 65 only when the vent plug is replaced by a lter check valve (order no. 1790-7408)
5) Other ratings possible when a Type373x-x Positioner is mounted. See corresponding mounting and operating instructions.

T 8313 EN 5
Table1.2: Explosion‑protection certicates for Type3372
Type3372 With integrated i/p converter WithType3725Positioner(directattachment)1)
Actuator area 120cm² 120cm² 350cm²
Rated travel 15mm 15mm 15mm 30mm
ATEX No. PTB 99 ATEX 2049 PTB 11 ATEX 2020 X
Date 1999-07-06 2011-08-25
Type of protection II2GExiaIICT6 II2GExiaIICT4
CSA Group
No.
–
2703735 X
Date 2014-06-03
Type of protection
ExiaIICT4;
Class I, Zone 0, AEx ia IIC T4;
Class I, Div. 1, Groups A, B, C & D
GOST
No.
–
RU C-DE.GB08.B.00697
Date 2014-12-15
Valid until 2019-12-14
Type of protection 1EXiaIICT4GbX
1) Versions with Type3730-x or Type3731-x Positioner on request
Table1.3: Further technical data for Type3372
Type3372 With integrated i/p converter WithType3725Positioner(directattachment)
Actuator area 120cm² 120cm² 350cm²
Rated travel 15mm 15mm 15mm 30mm
Pneumaticdata
Tight-closing function Stem
retracts
Stem
retracts
Stem
extends
Stem
extends
Stem
retracts
Stem
retracts
Stem
extends
Stem
extends
Stem
retracts
Stem
extends
Stem
retracts
Stem
extends
Bench range 0.4 to 1.4 1.4 to 2.3 2.1 to 3.3 0.4 to 1.4 1.4 to 2.3 2.1 to 3.3 1.5 to 2.1 2.1 to 2.7 1.5 to 2.7 2.2 to 3.8
Supply pressure Max.
6 bar Max. 4 bar Max. 6 bar Max. 6 bar 1) Max. 6 bar
Materials
Actuator housing Aluminum, powder paint coated Aluminum, powder paint coated 1.0332
Diaphragm NBR NBR NBR
Actuator stem 1.4305 1.4305 1.4401/1.4404
Weight(withoutpositioner)
kg (approx.) 3.7 3.3 15
Attachment
FormB FormB or FormC
(see Table2) FormC
Compliance
·
1) With “stem extends” fail-safe action and travel stop, the supply pressure must not exceed the upper spring range value by more than 1.5bar.
Table1.4: Technical data of Type4744‑2 Limit Switch
Type4744‑2LimitSwitch
Travel range 15mm
Permissible load AC voltage: 250V/5A
DC voltage: 250V/0.4A
Temperature range –20 to +60°C
Degree of protection IP66
Explosion protection Flameproof enclosure II2GExdbIICT6-T5
Weight, approx. 0.4kg
Associated documentation uT8367

6T 8313 EN
Mountingtypes
There are two types of mounting depending on the valve/actuator combination: mounting using a crossbeam or mounting on rods.
When the actuator is mounted to the valve using a crossbeam (Form B, Fig.8), the actuator is fastened to the valve bonnet using a
central nut.
When the actuator is mounted on rods (Form C, Fig.9) the actuator is connected to the valve bonnet using rods. In this case, a
crossbeam is not required for mounting the actuator.
Table2: Mounting types (see Fig.8 and Fig.9)
Version Integrated i/p
converter
Type3725Positioner(directattachment)
Actuator area 120cm² 120cm² 350cm²
Travel 15mm 15mm 15mm 30mm
Type...Valve NominalsizeDN
3321 15 to 50 FormB FormB –
–
3321 65 to 100 –FormC FormC –
3321 100 –––FormC
3323 15 to 50 FormB FormB – –
3323 65 to 80 –FormC FormC –
3323 100 –––FormC
3531 15 to 80 FormB FormB –
–
3535 15 to 80 FormB FormB –
–
3214 65 to 100 FormB FormB –
–
3214 125 to 250 –––On request
3260 65 to 80 FormB FormB –
–
3260 100 to 150 –––On request
Fig.8: FormB: mounting using crossbeam Fig.9: FormC: mounting on rods

T 8313 EN 7
Table3: Bench ranges of Type3372 Actuator
Actuatordiaphragmarea[cm²] Ratedtravel[mm] Travelvolumeatratedtravel[cm³] Benchrange[bar](signalpressure rangeatratedtravel) Additionalpossiblespringpre‑ loading No.ofsprings
Fail‑safeaction:actuatorstemextends Fail‑safeaction:actuatorstemretracts
Springforceat
0mmtravel[kN]
Springforceat
ratedtravel[kN]
Springforce[kN]atratedtravel
andsupplypressure[bar]of
23456
120
15
1800 0.4 to 1.4
–
4 0.5 1.7 0.7 1.9 3.1 – –
1800 1.4 to 2.3 8 1.7 2.8 –0.8 2 3.2 4.4
1800 2.1 to 3.3 12 2.5 4.0 –––––
350
5250 1.5 to 2.1 8 – – – 3.15 6.65 6.65 6.65
5250 2.1 to 2.7 6 7.35 9.5 –––––
30 10500 1.5 to 2.7 8 – – – 1.05 4.55 8.05 11.55
10500 2.2 to 3.8 12 7.7 13 –––––
Dimensiondiagrams·All dimensions in mm
With integrated i/p converter
Ø30
309
Supply
236
Ø168
PG11
G
18
G¼
G¼
Ø168
Ø30
120cm² actuator area
(actuator stem extends)
120cm² actuator area
(actuator stem retracts)
With Type3725 Positioner (direct attachment)
182
Ø168
Ø280
231
120cm² actuator area
(actuator stem retracts/extends)
350cm² actuator area
(actuator stem retracts/extends)

Specications subject to change without notice
SAMSON AG · MESS- UND REGELTECHNIK
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: [phone] · Fax: [phone]
[email protected] · www.samson.de
T8313EN
2016-11-22 · English
Orderspecications:
Electropneumatic
actuator
Type3372
Version With integrated i/p converter
With Type3725 Positioner (direct
attachment)
Attachment to the valve Type…
Mounting type According to Table2
Actuator area 120 or 350cm²
Valve travel 15 or 30mm
Tight-closing function Actuator stem extends (FA)
Actuator stem retracts (FE)
Bench range According to Table3
Valve accessories Type4744-2 Limit Switch