This isolated barrier is used for intrinsic safety applications.

The device drives SMART I/P converters, electrical valves, and positioners in hazardous areas.

Digital signals are superimposed on the analog values at the field side or control side and are transferred bi-directionally.

Current transferred across the DC/DC converter is repeated at terminals 1 and 2. Terminals 2 and 3 are used when no short circuit detection is

required.

An open or short field circuit presents a high impedance to the control side to allow alarm conditions to be monitored by the control system.

If the HART communication resistance in the loop is too low, the internal resistance can be used.

Test sockets for the connection of HART communicators are integrated into the terminals of the device.

A fault is signalized by LEDs and a separate collective error message output.

General specifications

Signal type Analog output

Functional safety related parameters

Safety Integrity Level (SIL) SIL 2

Systematic capability (SC) SC 3

Supply

Connection Power Rail or terminals 14+, 15-

Rated voltage Ur 19 ... 30 V DC

Ripple ≤ 10 %

Rated current Ir ≤ 30 mA at 24 V

Power dissipation ≤ 600 mW at 20 mA and 500 Ω load

Power consumption ≤ 700 mW

Input

Connection side control side

Connection terminals 7-, 8+, (9+)

Input signal 4 ... 20 mA , limited to approx. 30 mA

Input voltage open loop voltage of the control system ≤ 30 V

Voltage drop approx. 6 V at 20 mA

Input resistance field wiring open circuit : > 100 kΩ

field wiring < 50 Ω : > 100 kΩ when using terminals 1 and 2

Output

Connection side field side

Connection terminals 1+, 2-

terminals 3+, 2- (no short circuit detection)

Voltage ≥ 13 V at 20 mA

Current 4 ... 20 mA

Load 100 ... 650 Ω , for terminals 1, 2

0 ... 550 Ω , for terminals 2, 3

Ripple 20 mV rms

Line fault detection breakage, load > 100 kΩ, short-circuit, load < 50 Ω

Fault indication output

Output type open collector transistor (internal fault bus)

Transfer characteristics

Deviation at 20 °C (68 °F), 4 ... 20 mA

< 0.1 % of full scale, incl. non-linearity and hysteresis

Influence of ambient temperature < 2 µA/K (-20 ... 70 °C (-4 ... 158 °F)); < 4 µA/K (-40 ... -20 °C (-40 ... -4 °F))

Frequency range field side into the control side: bandwidth with 0.5 Vpp signal 0 ... 3 kHz (-3 dB)

control side into the field side: bandwidth with 0.5 Vpp signal 0 ... 3 kHz (-3 dB)

Rise time 10 to 90 % ≤ 10 ms

Galvanic isolation

Input/Output basic insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff

Input/power supply basic insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff

Output/power supply reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff

Indicators/settings

Display elements LEDs

Labeling space for adhesive label at the front

Directive conformity

Electromagnetic compatibility

Directive 2014/30/EU EN 61326-1:2013 (industrial locations)

Conformity

Electromagnetic compatibility NE 21:2017

EN 61326-3-2:2018

Degree of protection IEC 60529

Protection against electrical shock UL 61010-1:2012

Ambient conditions

Ambient temperature -40 ... 70 °C (-40 ... 158 °F)

Mechanical specifications

Degree of protection IP20

Connection screw terminals

Mass approx. 115 g

Dimensions 20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch) (W x H x D) , housing type B2

Mounting on 35 mm DIN mounting rail acc. to EN 60715:2001

Data for application in connection with hazardous areas

EU-type examination certificate BAS 00 ATEX 7240 X

Marking 1 II (1)G [Ex ia Ga] IIC

1 II (1)D [Ex ia Da] IIIC

1 I (M1) [Ex ia Ma] I

Output Ex ia, Ex iaD

Voltage Uo 25.2 V

Current Io 93 mA

Power Po 585.3 mW

Internal capacitance Ci 1.05 nF

Internal inductance Li 0

Supply

Maximum safe voltage Um 250 V rms (Attention! The rated voltage can be lower.)

Input

Maximum safe voltage Um 250 V rms (Attention! The rated voltage can be lower.)

Certificate TÜV 99 ATEX 1499 X

Marking 1 II 3G Ex nA II T4

Galvanic isolation

Input/Output safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V

Output/power supply safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V

Directive conformity

Directive 2014/34/EU EN 60079-0:2018 , EN 60079-11:2012 , EN 60079-15:2005

KFD2-SCD2-Ex1.LK

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