Field Barrier Ex d/Ex iType 3770

Mounting andOperating Instructions

EB 8379 ENEdition February 2010

Fig. 1 · Type 3370 mounted on Type 3780 Positioner

Contents Page

1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 31.1 Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Mounting on a positioner. . . . . . . . . . . . . . . . . . . . . . . . 7

3 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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Contents/Safety instructions

General safety instructions

� The device may only be installed, started up or operated by trained andexperienced personnel familiar with the product.According to these mounting and operating instructions, trained personnel isreferred to as individuals who are able to judge the work they are assignedto and recognize possible dangers due to their specialized training, theirknowledge and experience as well as their knowledge of the relevantstandards.

� Explosion-protected versions of this device may only be operated bypersonnel who have undergone special training or instructions or who areauthorized to work on explosion-protected devices in hazardous areas.

� Proper shipping and appropriate storage are assumed.

� Note: The device with a CE marking fulfils the requirements of the Directives94/9/EC (ATEX) and 89/336/EEC (EMC).The Declaration of Conformity can be viewed and downloaded from theSAMSON website at www. samson.de.

1 Design and principle ofoperation

The field barrier is suitable for operatingpositioners, positioners with HART® commu-nication, electropneumatic converters, sole-noid valves or limit switches.Devices with HART® communication needan adaptation, which is available e.g. withType 3730-3 and Type 3730-6 Positioners.

Upstream connection of intrinsically safefield devices and direct attachment to themenables the intrinsically safe circuits of thesedevices to be connected to the non-intrinsi-cally safe circuits of upstream input and out-put units. In this way, the benefits of intrinsi-cally safety, such as commissioning andworking under voltage, are kept within thehazardous area.

The connecting lead of non-intrinsically safecircuits to the field barrier is guided into theenclosure either over a cable conduit or us-ing metal, type-approved cable glands. Thefield barrier transmits the analog referencevariable, including HART protocol, toelectropneumatic converters and positioners.

Field barriers must be connected to theequipotential bonding system of the plant.For this purpose, a version with minus-sidedequipotential bonding (non-floating) and afloating version are available. The version isselected to match the earth of the analogoutput of the controller or control system.

The triple channel version additionally al-lows the connection of two limit switches ac-cording to EN 60947-5-6 or an intrinsicallysafe solenoid valve and a limit switch. AnM20 x 1.5 adapter enables the direct con-

nection of field devices through the cableentry.

Channel 1 of the field barrier is especiallydesigned to transmit an analog signal in therange from 4 to 20 mA and also can trans-mit HART protocol.The optional channels 2 and 3 are intendedto control limit switches that conform to theEN 60947-5-6 standard or Ex i solenoidvalves (e.g. Type 3767 Positioners with asolenoid valve coil for 6 V).

When interconnecting the field barrier withmulti-channel switch amplifiers, it is impor-tant to make sure that the different channelsin the switch amplifier do not operate on acommon potential. Otherwise unwanted in-teraction of the limit switches could occur.

Note!In case of doubt, only use single-channelswitch amplifiers.

The individual current circuits of the Type3770 Ex d/Ex i Field Barrier are electricallyconnected with the internal and externalequipotential bonding terminal.For safety reasons, the intrinsically safe cir-cuits must be connected to the equipotentialbonding system of the plant. The connectionbetween the equipotential bonding terminaland the equipotential bonding system mustbe as short as possible.Channels 2 and 3 are set up to be barriersfor positive potential.Channel 1 is set up to be floating (Fig. 2,left) or for positive potential (Fig. 2, right).

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Design and principle of operation

4 EB 8379 EN

Design and principle of operation

2

1

4

3

6

5

CH1

CH2

+

_

+

_

+

_

2

1

4

3

6

5

CH3

Ex ia

Ex ia

Ex ia

CH1

CH2

+

_

+

_

+

_

CH3

Ex ia

Ex ia

Ex ia

Fig. 2 · Type 3770-1310, Channel 1 floating Type 3770-1410, Channel 1 non-floating

Equipotentialbonding terminalEquipotential bonding terminal

Fig. 3 · Examples of connections with SAMSON positioners

Safe area Hazardous area

Safe areaHazardous area

Field barrierwith three channels

Field barrierwith a singlechannel

Non Ex (i)Analog control signal

Non Ex (i)Analog control signal

Non Ex (i)Binary signal

Non Ex (i)Binary signal

Ex d enclosure

Ex d enclosure

Ex i field deviceEx i

Ex i

Ex i

Ex i field deviceEx i

1.1 Versions

5 EB 8379 EN

Versions

Field barrier acc. to ATEX Type 3770- 1 x x x 0 x x x

Three channels4 to 20 mA, floatingand two 2 circuits acc. to EN 60947-5-6

3

Three channels4 to 20 mA, non-floatingand two 2 circuits acc. to EN 60947-5-6

4

Electrical connection

Female thread ½ NPT 1

Female thread M20 x 1.5 3

Housing material

Die-cast aluminum 0

Stainless steel AISI 316 1

Special version

None 0 0 0

GOST approval 0 0 1

1.2 Technical data

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Technical data

Type of protection EExd [ia] IIC T6

Connection Channel 1Ch 1 +/–

Channel 2 and 3Ch 2 +/–, Ch 3 +/–

Operating values (0) 4 to 20 mAor UN up to 15 V DC

(0) 4 to 20 mAor UN up to 10 V DC

or limit switches acc. to EN 60947-5-6,not suitable for transmitter supply

Input Um = 250 V

Fuse rating IN = 80 mA time lag

Output circuit EEx ia IIC

Maximum values according toEC-Type Examination Certificate

max. output voltage U0 ≤ 17.2 V ≤ 12.6 V

max. output current I0 ≤ 110 mA ≤ 49 mA

max. power P0 ≤ 473 mW* ≤ 154 mW*

max. perm. capacitance C0 360 nF/IIC, 2.1 μF/IIB 1.15 μF/IIC, 7.4 μF/IIB

max. perm. inductance L0 3 mH/IIC, 12 mH/IIB 15 mH/IIC, 56 mH/IIB

Series resistance RLmax 190 Ω 285 Ω

Load impedance 3.8 V/20 mA 5.7 V/20 mA

Perm. ambient temperature –45 °C ≤ ta ≤ 60 °C T6

Degree of protection IP 65 acc. to IEC 529

Enclosure materials Die-cast aluminum, painted or stainless steel AISI 316

* Linear output characteristic

2 Mounting on a positioner

Remove the cable entry at the side of thepositioner or the screw plug from thepositioner. Insert the free cable ends andscrew in the field barrier (M20 x 1.5thread). Turn the enclosure to face the direc-tion you require and secure this positionwith coupling nut. Connect the free cableends to the terminal of the positioner asshown in Fig. 5.

3 Electrical connections

As far as the electrical installation ofthe device is concerned, the relevantnational regulations governing theinstallation of electrical equipmentand the national accident preventionregulations of the country of destina-tion must be adhered to.In Germany,these are the VDE regulations andaccident prevention regulations ofthe employer's liability insurance.Forinstallation in hazardous areas, thefollowing standards apply:EN 60079-14: 1997; VDE 0165Part 1/8.98 "Electrical apparatus forexplosive gas areas" andEN 50281-1-2: VDE 0165 Part 2/11.99 "Electrical apparatus for usein the presence of combustible dust".For intrinsically safe electrical appa-ratus that are certified according tothe Directive 79/196/EEC, the dataspecified in the certificate of confor-mity apply for connection of intrinsi-cally safe circuits.For intrinsically safe electrical appa-ratus that are certified according tothe Directive 94/9/EC, the data spe-cified in the EC-type examinationcertificate apply for connection of in-trinsically safe circuits.Caution: Always use the same termi-nal assignment as specified in thecertificate. Reversal of the electricalconnections may cause the explosionprotection to be ineffective!

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Mounting on a positioner

130Ø90

NPT ½

M20x1.5

Fig. 4 · Mounting to a positioner, e.g. Type 3780

orM20 x 1.5

Guide the free wiring ends of the field bar-rier from Ch1, and if applicable, Ch2 andCh3 (channel 1, 2 and 3) to their assignedterminals in the positioner (Figs. 5 and 6).

Insulate free wire ends of unused channels.

The connecting lead from the non-intrinsi-cally safe circuit to be connected to the fieldbarrier must be inserted either over a cableconduit or with metal type-approved cableglands.

Connect the individual wires to the terminalsmarked Ch1, and if applicable, Ch2 andCh3 (channel 1, 2 and 3) in the enclosure ofthe field barrier. The terminals are designedfor wire sizes of 0.5 to 2.5 mm.

8 EB 8379 EN

Electrical connections

PA _ +

Ch1

1 2 3 4 5 6

_ +

Ch2_ +

Ch3

EiA/

Fig. 5 · Terminals

Output with marked cable ends Ex i

TerminalcompartmentEx d

4 to 20 mAcontrol signal

Switching amplifier acc. to EN 60947-5-6 (single channel,if applicable) for limit switch or activation for solenoidvalve up to 10 V or analog signal (0)4 to 20 mA,not suitable for two-wire transmitter supply

yellow/green

EB 8379 EN 9

Electrical connections

EiA/

EiA/

Ep

Ch12

1

4

3

6

5

2

1

4

3

6

5

2

1

4

3

6

5

+_

+11

–12

Ch2+_

+41

–42

+51

–52

+81

–82

Ch3+_

+41

–42

+51

–52

+81

–82

_10V

_10V<

_10V<

_10V<

<

_10V

GW2GW1

GW2GW1

Ch2+_

+41

–42

Ch1+_

+11

–12

+51

–52

+81

–82

+83

–84

GW2GW1<

_10V

Ch3+_

+41

–42

+51

–52

Ch2+_

+41 1

2

–42

Ch1+_

+81

–82

41

42

Ch3+_

+51

–52

52

53

+81

–82

+83

–84

GW2GW1<

EiA/

2

1

4

3

6

5

Ch2+_

+41

–42

Ch1+_

+11

–12

+83

–84

A1

Ch3+_

+51

–52

+83

–84

A2A3

A3

_15V<

Fig. 6 · Connection examples

Field barrier mounted on Type 3767 Positioner

Field barrier mounted on Type 3730-1/-2/-3 Positioner

Field barrier mounted on Type 3780 Positioner

Field barrier mounted on SAMSOMATIC Type 3776 Limit Switch

or

or

or

or

or

or

or

or

or

or

or

or

or

or

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SAMSON AG · MESS- UND REGELTECHNIKWeismüllerstraße 3 · 60314 Frankfurt am Main · GermanyPhone: +49 69 4009-0 · Fax: +49 69 4009-1507Internet: http://www.samson.de EB 8379 EN 20

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