Resistance Repeater

KCD2-RR2-Ex1
< 1-channel isolated barrier
< 24 V DC supply (Power Rail)
< Resistance and RTD input (Pt100, Pt500, Pt1000)
< Resistance output
< Accuracy 0.1 %
< Line fault detection (LFD) for Pt100
< Housing width 12.5 mm
< SIL 2 (SC 3) acc. to IEC/EN 61508

Function

This isolated barrier is used for intrinsic safety applications.

It transfers resistance values of RTDs or potentiometers from hazardous areas to safe areas.
A 2-, 3-, or 4-wire technique is available depending on the required accuracy.
The input card of the control system measures the same load as if it were connected directly to the resistance in a hazardous area.

Connection

KCD2-RR2-Ex1

4+ 6+

3+ 8+ mA

1- 7-

2- 5-

9+
10-
24 V DC

Zone 0, 1, 2 24 V DC Zone 2
Release date: 2021-12-13 Date of issue: 2021-12-13 Filename: 314455_eng.pdf

Div. 1, 2 Power Rail Div. 2

Technical Data
General specifications
Signal type Analog input
Functional safety related parameters
Safety Integrity Level (SIL) SIL 2
Systematic capability (SC) SC 3
Supply
Connection Power Rail or terminals 9+, 10-
Rated voltage Ur 19 ... 30 V DC
Ripple within the supply tolerance
Rated current Ir < 28 mA
Power consumption 0.35 W (24 V and 1 mA sense current), 0.85 W (30 V and 10 mA sense current)

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

Pepperl+Fuchs Group USA: +1 330 486 0002 Germany: +49 621 776 2222 Singapore: +65 6779 9091
www.pepperl-fuchs.com pa-info@us.pepperl-fuchs.com pa-info@de.pepperl-fuchs.com pa-info@sg.pepperl-fuchs.com 1
 Resistance Repeater KCD2-RR2-Ex1
Technical Data
Input
Connection side field side
Connection terminals 1, 2, 3, 4
Line fault detection yes , at Pt100
Lead resistance ≤ 10 % of resistance value
Transmission range 0 ... 10 mA
Available voltage 7V
Line fault detection < 30 nA
Output
Connection side control side
Connection terminals 5-, 7-, 6+, 8+
Current 0 ... 10 mA
Available voltage 0 ... 4.2 V
Fault signal field voltage < 150 mV or > 4 V, depending on lead disconnected
Reverse polarity protection for I < 10 mA or U < 20 V
Transfer characteristics
Accuracy 0.1 %
Deviation Im ≥ 1 mA: ±0.1 % of Rm or ± 0.1 Ω (the larger value is applicable)
Im < 1 mA: accuracy reduces in proportion to Im.
e. g. Im = 0.1 mA: ± 1 % of Rm or 1 Ω (the larger value is applicable).
Influence of ambient temperature Im ≥ 1 mA, Rm ≥ 100 Ω: 0.01 %/K in the range -20 ... +70 °C (-4 ... 158 °F)
Im < 1 mA or Rm < 100 Ω: temperature stability reduces in proportion to Im or Rm
Settling time ≤ 5 ms
Rise time/fall time ≤ 2 ms (10 ... 90%)
Galvanic isolation
Output/power supply functional insulation, rated insulation voltage 50 V AC
Indicators/settings
Display elements LED
Control elements DIP switch
Configuration via DIP switches
Labeling space for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EU EN 61326-1:2013 (industrial locations)
Conformity
Electromagnetic compatibility NE 21:2017
EN IEC 61326-3-2:2018
Degree of protection IEC 60529:2001
Protection against electrical shock UL 61010-1:2012
Release date: 2021-12-13 Date of issue: 2021-12-13 Filename: 314455_eng.pdf

Ambient conditions
Ambient temperature -40 ... 70 °C (-40 ... 158 °F)
Mechanical specifications
Degree of protection IP20
Connection screw terminals
Mass approx. 100 g
Dimensions 12.5 x 119 x 114 mm (0.5 x 4.7 x 4.5 inch) (W x H x D) , housing type A2
Mounting on 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection with hazardous areas
EU-type examination certificate BASEEFA 10 ATEX 0061X
Marking 1 II (1)G [Ex ia Ga] IIC
1 II (1)D [Ex ia Da] IIIC
1 I (M1) [Ex ia Ma] I
Input [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
Voltage Uo 9.5 V
Current Io 39.22 mA

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

Pepperl+Fuchs Group USA: +1 330 486 0002 Germany: +49 621 776 2222 Singapore: +65 6779 9091
www.pepperl-fuchs.com pa-info@us.pepperl-fuchs.com pa-info@de.pepperl-fuchs.com pa-info@sg.pepperl-fuchs.com 2
 Resistance Repeater KCD2-RR2-Ex1
Technical Data
Power Po 93 mW
Supply
Maximum safe voltage Um 250 V (Attention! The rated voltage can be lower.)
Output
Maximum safe voltage Um 250 V (Attention! The rated voltage can be lower.)
Certificate BASEEFA 10 ATEX 0062X
Marking 1 II 3G Ex ec IIC T4 Gc
Galvanic isolation
Input/Output safe electrical isolation acc. to IEC/EN 60079-11:2007, voltage peak value 375 V
Input/power supply safe electrical isolation acc. to IEC/EN 60079-11:2007, voltage peak value 375 V
Directive conformity
Directive 2014/34/EU EN IEC 60079-0:2018 , EN 60079-7:2015+A1:2018 , EN 60079-11:2012
International approvals
FM approval
FM certificate FM 19 CA 0039 X , FM 19 US 0067 X
Control drawing 116-0457 (cFMus)
UL approval E106378
Control drawing 116-0332 (cULus)
IECEx approval
IECEx certificate IECEx BAS 10.0024X
IECEx BAS 10.0025X
IECEx marking [Ex ia Ga] IIC , [Ex ia Da] IIIC , [Ex ia Ma] I
Ex ec IIC T4 Gc
General information
Supplementary information Observe the certificates, declarations of conformity, instruction manuals, and manuals
where applicable. For information see www.pepperl-fuchs.com.

Assembly

Front view
Removable terminals
blue

1 2 LED green:
3 4
Power supply

KCD2-RR2-
Ex1

PWR
Release date: 2021-12-13 Date of issue: 2021-12-13 Filename: 314455_eng.pdf

S1

I II

Switch S1

5 6
7 8
9 10

Removable terminals
green

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

Pepperl+Fuchs Group USA: +1 330 486 0002 Germany: +49 621 776 2222 Singapore: +65 6779 9091
www.pepperl-fuchs.com pa-info@us.pepperl-fuchs.com pa-info@de.pepperl-fuchs.com pa-info@sg.pepperl-fuchs.com 3
 Resistance Repeater KCD2-RR2-Ex1
Matching System Components
KFD2-EB2 Power Feed Module

UPR-03 Universal Power Rail with end caps and cover, 3 conductors, length: 2 m

UPR-03-M Universal Power Rail with end caps and cover, 3 conductors, length: 1,6 m

UPR-03-S Universal Power Rail with end caps and cover, 3 conductors, length: 0.8 m

K-DUCT-BU Profile rail, wiring comb field side, blue

K-DUCT-BU-UPR-03 Profile rail with UPR-03- * insert, 3 conductors, wiring comb field side, blue

Accessories
KC-ST-5GN Terminal block for KC modules, 2-pin screw terminal, green

KC-ST-5BU Terminal block for KC modules, 2-pin screw terminal, blue

EBP 2- 5 Insertion bridge for connectors, 2-pin, fully insulated

KF-CP Red coding pins, packaging unit: 20 x 6

Release date: 2021-12-13 Date of issue: 2021-12-13 Filename: 314455_eng.pdf

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

Pepperl+Fuchs Group USA: +1 330 486 0002 Germany: +49 621 776 2222 Singapore: +65 6779 9091
www.pepperl-fuchs.com pa-info@us.pepperl-fuchs.com pa-info@de.pepperl-fuchs.com pa-info@sg.pepperl-fuchs.com 4
 Resistance Repeater KCD2-RR2-Ex1

Configuration

PWR

S1

I II
S1
I II

Switch position

Switch Input Position

S1 2-wire technique II
3-wire technique I
4-wire technique II

Factory settings: switch 1, in position I

Refer to the next section for connection information.

Additional Information
Function
When a signal converter, a DCS or PLC is connected to terminals 5, 6, 7, and 8 (control side), the measuring current is
transferred to terminals 2 and 4 (field side). The resulting voltage at terminals 1, and 3 is transferred to terminals 5, 6, 7, and 8.
In the case of fast multiplex input cards, transmission problems might be experienced in connection with low resistance values
and/or high sensor currents. For data see rise time.
The quoted accuracy is for a 4-wire technique connection. The accuracy in 3-wire technique will depend on the matching of the
line resistance.

Connection types control side (safe area)

Release date: 2021-12-13 Date of issue: 2021-12-13 Filename: 314455_eng.pdf

2-wire technique 3-wire technique 3-wire technique 4-wire technique

negative positive
measuring line measuring line

8 6 5 7 8 6 5 7 8 6 5 7 8 6 5 7
+ + - - + + - - + + - - + + - -

DCS, PLC, DCS, PLC, DCS, PLC, DCS, PLC,

Signal Signal Signal Signal
converter converter converter converter

Connection types field side (hazardous area)

The resistance in the hazardous area can be measured with a 2-, 3- or 4-wire technique.

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

5
Pepperl+Fuchs Group USA: +1 330 486 0002 Germany: +49 621 776 2222 Singapore: +65 6779 9091
www.pepperl-fuchs.com pa-info@us.pepperl-fuchs.com pa-info@de.pepperl-fuchs.com pa-info@sg.pepperl-fuchs.com
 Resistance Repeater KCD2-RR2-Ex1
• 2-wire technique:
Link terminals 1 and 2 and terminals 3 and 4. Connect the resistance to terminal 4 and terminal 2. Switch S1 in the position II.
• 3-wire technique:
Link terminals 1 and 2. Connect the resistance to terminals 3 and 4 and terminal 2. Switch S1 in the position I.
• 4-wire technique
Connect the resistance to terminals 3 and 4 and terminals 1 and 2. Switch S1 in the position II.

Measurement range
The resistance repeater can convey a maximum of 10 mA and a maximum of 4.2 V. The maximum connectable resistance value
can be calculated with the following equation: resistance value = 4.2 V / measuring current
The measuring current is determined by control.
Measuring current
I (mA)

10

0.5

2 4 6 8 8.4 10 12 kΩ
Max. resistance
of sensor

An example of the maximum transferable resistance value:

• 4.2 k at 1 mA measuring current
• 420  at 10 mA measuring current

Line Fault Detection (LFD)

The output will indicate less than 15  or greater than 400  for a lead breakage at terminals 1, 2, 3 or 4 for measuring current
of less than or equal to 10 mA i. e. out of range for Pt100.
Release date: 2021-12-13 Date of issue: 2021-12-13 Filename: 314455_eng.pdf

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

6
Pepperl+Fuchs Group USA: +1 330 486 0002 Germany: +49 621 776 2222 Singapore: +65 6779 9091
www.pepperl-fuchs.com pa-info@us.pepperl-fuchs.com pa-info@de.pepperl-fuchs.com pa-info@sg.pepperl-fuchs.com