KROHNE SMARTMAC 400 Wiring diagram

Control and calibration unit for
digital SMARTPAT sensors
Intrinsically safe
Equipment protection level Gb
Ex ia IIC T4
SMARTMAC 400 Supplementary Instructions
© KROHNE 02/2022 - 4008424602 - AD SMARTMAC400 Ex R02 en

CONTENTS
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SMARTMAC 400
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EU conformity ................................................................................................................... 3
1.3 UK conformity................................................................................................................... 3
1.4 Approval according to the IECEx scheme ........................................................................ 4
1.5 Approval according to North-American standards ......................................................... 4
1.6 Safety instructions............................................................................................................ 5
2 Device description 6
2.1 Description of device ........................................................................................................ 6
2.2 Marking............................................................................................................................. 7
2.3 Approval for zone classified locations ............................................................................. 8
2.4 Approval for division classified locations......................................................................... 9
2.5 Temperature classes...................................................................................................... 10
2.6 Electrical data................................................................................................................. 10
3 Installation 11
3.1 Installation...................................................................................................................... 11
3.2 Special conditions........................................................................................................... 11
4 Electrical connections 12
4.1 General notes ................................................................................................................. 12
4.2 Power supply .................................................................................................................. 13
4.3 Grounding and equipotential bonding............................................................................ 14
4.4 Service connection ......................................................................................................... 14
4.5 Other connections .......................................................................................................... 14
5 Operation 15
5.1 Start-up........................................................................................................................... 15
5.2 Operation ........................................................................................................................ 15
5.3 Electrostatic charge ....................................................................................................... 15
6 Service 16
6.1 Maintenance ................................................................................................................... 16
6.2 Dismantling .................................................................................................................... 16
7 Notes 17

SAFETY INSTRUCTIONS 1
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1.1 General notes
These supplementary instructions apply to versions of the loop powered control and calibration
unit for use in hazardous areas that fall in intrinsically safe protection type "i", equipment
category II 2 G or EPL Gb.
It complements the standard documentation for versions for use in non-hazardous areas.
The information given in these instructions contains only the data relevant to explosion
protection.
The technical details given in the standard documentation for the non explosion-protected
versions remain unchanged unless they will be excluded or replaced by this instruction.
1.2 EU conformity
The manufacturer declares with the EU declaration of conformity on his own responsibility
conformity with the protection goals of directive 2014/34/EU for use in hazardous areas with gas.
Conformity with harmonised standards was checked by a notified body in accordance with
EN IEC 60079-0:2018 and EN 60079-11:2012.
The EU declaration of conformity for the equipment category II 2G is based on the following EU
type examination certificate:
The "X" after the certificate number refers to special conditions for safe use of the device, which
have been listed in these instructions.
If necessary, the EU type examination certificate can be downloaded from the manufacturer's
website.
1.3 UK conformity
The manufacturer declares with the UK declaration of conformity on his own responsibility
conformity with the protection goals of "Equipment and Protective Systems Intended for use in
Potentially Explosive Atmospheres Regulations 2016 No. 1107" for use in hazardous areas with
gas. Conformity with the regulations was checked in accordance with EN IEC 60079-0:2018
and EN 60079-11:2012 by an UK Approved Body.
The UK declaration of conformity is based on the UK type examination certificate issued by CSA
Group:
The "X" after the certificate number refers to special conditions for safe use of the device, which
have been listed in these instructions.
If necessary, the UK type examination certificate can be downloaded from the manufacturer's
website.
CSANe 20 ATEX 2256X
CSAE 21UKEX2343X

1 SAFETY INSTRUCTIONS
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1.4 Approval according to the IECEx scheme
Conformity for use in hazardous areas with gas was tested in accordance with the
"IECEx Certification Scheme for Explosive Atmospheres" according to IEC 60079-0: 2017 and
IEC 60079-11: 2011.
The number of the IEC certificate is:
The "X" after the certificate number refers to special conditions for safe use of the device, which
have been listed in these instructions.
If needed, the IEC certificate can be downloaded from the manufacturer's website.
1.5 Approval according to North-American standards
Equipment testing through QPS certifies that the equipment complies with applicable
CSA and ANSI/ISA standards. The product is eligible to bear the QPS mark shown with adjacent
indicators 'C' and 'US' for Canada and US.
The number of the QPS certificate is:
You can download the QPS certificate from the manufacturer's website.
The accompanying control drawing is included when the equipment is delivered.
IECEx CSA 20.0028X
QPS LR1322-15

SAFETY INSTRUCTIONS 1
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1.6 Safety instructions
If these instructions are not followed, there is a risk of explosion.
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
This product shall be used in explosive atmospheres together with approved associated
equipment. Follow the standard manual for the loop powered control and calibration unit of the
associated equipment when connecting.
The connecting cable between the loop powered control and calibration unit and the associated
equipment should be an insulated shielded cable; connect the shield to functional earth in a safe
area.
CAUTION!
The operator or his agent is responsible for observing any additional standards, directives or
laws if required due to operating conditions or place of installation.
This applies in particular to the use of easily detachable process connections when measuring
flammable media.
WARNING!
The user shall not change the configuration in order to maintain/ensure the explosion protection
performance of the control and calibration unit.
WARNING!
For use and maintenance in explosive atmospheres, observe the warning "POTENTIAL
ELECTROSTATIC CHARGING HAZARD". For further information refer to Electrostatic charge on
page 15
.
CAUTION!
Operating conditions and place of installation may require compliance with additional standards,
directives or laws. The responsibility for compliance rests solely with the operator or his agent.

2 DEVICE DESCRIPTION
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2.1 Description of device
This 2-wire device can be connected to digital SMARTPAT sensors.
Without additional accessories, the calibration and configuration of the sensors can be
performed directly at the application. The two free programmable relays and the second current
output allow process control. Different customer-specific measurement pages with up to
4 displayed values enable a detailed monitoring of the process.
By using the second current output it is possible to use the backlight and high brightness LEDs
for NAMUR NE 107 status signalisation.
Figure 2-1: Device description
1 Display
2 Operation keys
3 Cable glands
4 High-brightness LEDs for NAMUR NE 107 status signalisation

DEVICE DESCRIPTION 2
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2.2 Marking
Figure 2-2: Example of a nameplate on the indicator body
1 Manufacturer information
2 Device name
3 CE / UK marking
4 Ex marking
5 Observe the operation and installation instruction;
data matrix code (serial number); China RoHS; electronic / electric device waste marking
6 Power supply data
7 Order code; manufacturing date; internet address
8 Serial number; electronic revision
9 Production order
SMARTMAC 400
CSANe 20 ATEX 2256X
II2G Ex ia IIC T4 Gb
Tamb: -20°C...+70°C
LOOP1: Ui=30V li=120mA Pi=1W Ci=45nF Li=0
LOOP2: Ui=30V li=120mA Pi=1W Ci=25nF Li=0
RELAY: Ui=30V li=30mA Pi=100mW Ci=15nF Li=0
PA: #########.###
SN: #########.###
ER1.1P ########
VG############
MD: 20##
www.krohne.com
IP66/67
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.

2 DEVICE DESCRIPTION
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2.3 Approval for zone classified locations
The device meets the requirements of IEC 60079-11 for protection type "Intrinsic Safety".
The explosion protection is ensured by limitation of the current and voltage so that no ignitable
energy can occur. The equipment protection level (EPL) Gb enables the use in areas classified as
zone 1...zone 2.
The marking of the display in accordance with the requirements of the ATEX directive is as
follows:
II 2 G Ex ia IIC T4 Gb
The marking of the display in accordance with the requirements of the IECEx scheme is as
follows:
Ex ia IIC T4 Gb
The marking of the display in accordance with the Canadian and US requirements for zone
classified locations in accordance with NEC 505 (National Electrical Code) is as follows:
Ex ia IIC T4 Gb / Class I, Zone 1 AEx ia IIC T4 Gb
II Group II classified equipment
2Equipment category 2
GGas explosion protection
Ex ia Equipment protection by intrinsic safety, level of protection ia
IIC Gas group IIC approved, suitable for gas groups IIA, IIB, IIC
T4 Temperature class T4 approved, suitable for T4...T1
Gb EPL Gb approved, suitable in zone 1...zone 2
Table 2-1: Components of the Ex marking and their definition
Class I Gas explosion protection
Ex ia Equipment protection by intrinsic safety, level of protection ia
Zone 1 AEx Zone 1 approved according to US standards
IIC Gas group IIC approved, suitable for gas groups IIA, IIB, IIC
T4 Temperature class T4 approved, suitable for T4...T1
Gb EPL Gb approved, suitable in zone 1...zone 2
Table 2-2: Components of the Ex marking and their definition

DEVICE DESCRIPTION 2
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2.4 Approval for division classified locations
The device meets the requirements of Canadian and US standards for the "division" concept
according to NEC 500 in protection type "Intrinsic Safety". The explosion protection is ensured by
limitation of the current and voltage so that no ignitable energy can occur.
The marking of the display in accordance with the requirements of the applicable National
Electrical Code (NEC 500) and the Canadian Electrical Code (CEC) is as follows:
IS Class I, Division 1, Groups A to D
IS Intrinsically safe equipment
Class I Explosion protection for gas
Division 1 Division 1 approved, suitable for Division 1, Division 2
Groups A to D Gas groups A, B, C, D approved
Table 2-3: Components of the Ex marking and their definition

2 DEVICE DESCRIPTION
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2.5 Temperature classes
The permissible temperature range of the device for use in temperature class T4...T1 is:
The maximum permissible temperature is valid under the following conditions:
•The device is operated in its intended mounting position.
•The device is not exposed to heat radiation (e.g. direct sunlight, adjoining hot parts).
•Insulation does not obstruct the ventilation of the device.
2.6 Electrical data
The separate intrinsically-safe signal circuits of the device may only be connected to separate
certified intrinsically safe isolating amplifiers or Zener barriers with the following maximum
values per circuit:
Temperature class Permissible ambient
temperature in [°C]
Permissible ambient
temperature in [°F]
T4...T1 -20...+70 -4...+158
Table 2-4: Permissible temperature range
Device version Maximum values
Circuit
Terminals
Ui [V] Ii [mA] Pi [W] Ci [nF] Li [H]
SMARTMAC 400 Loop 1
Current output 4...20 mA
C, D, E, HART®
Sensor connection
A1, B1
30 120 1 45 ~ 0
Loop 2
Current output 4...20 mA
J, K
30 120 1 25 ~ 0
Relay 1
F, G 30 30 0.1 15 ~ 0
Relay 2
H, I 30 30 0.1 15 ~ 0
Table 2-5: Maximum values per circuit
CAUTION!
The capacity and inductance of the connecting cable between the supply device, control and
calibration unit and connected sensor as well as the capacity and inductance of the sensor must
also be taken into account.
WARNING!
Also, when operating the control and calibration unit outside of the hazardous area, the
connection must be made to an intrinsically safe circuit. When connecting to non-intrinsically
safe circuits, there is a risk of damage to the safety-defining components.

INSTALLATION 3
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3.1 Installation
3.2 Special conditions
Electrostatics
If the installation takes place in hazardous areas of group IIC, the instructions for electrostatics
must be observed.
For further information refer to
Electrostatic charge on page 15.
Class I, Division I applications
CAUTION - When supplied with Aluminium housing, care shall be taken to protect it from impact
or abrasion when located in a Class I, Division I location.
DANGER!
Mounting and setup must be carried out according to the applicable installation standards
(e.g. EN 60079-14) by qualified personnel trained in explosion protection.
Observe the information contained in the manuals and the supplementary instructions.
The installation must always comply with the following requirements:
• No external forces are affecting the device.
• The device is accessible for any necessary visual inspections and can be viewed from all
sides.
• The nameplate is clearly visible.
• It can be operated from a location with secure footing.

4 ELECTRICAL CONNECTIONS
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4.1 General notes
The electrical connection of the intrinsic safe equipment takes place in the control and
calibration unit.
The separated circuits are designed in protection type "intrinsically safe" and are galvanically
isolated from ground (test voltage 500 Veff).
In order to avoid risks, always observe the following points when electrically connecting a device:
•Ensure that all connecting cables conform to the valid installation standards
(e.g. IEC 60079-14) and withstand the maximum operating temperature.
•Securely lay the connecting cables and sufficiently protect them against damage.
•Before inserting the electrical connecting cables of the device, ensure that all the cables
leading to the control and calibration unit are de-energised both in relation to themselves
and to the reference potential of the explosive area.
•Do not lay any connecting cables in the area between the housing and the ribbon cable.
•Securely connect all the cores not in use with the ground potential of the explosive area or
carefully insulate them from each other and from ground (test voltage 500 Veff).
•Supplied blind plugs / cable entries guarantee protection against foreign objects and water
(protection category) IP66 / 67 according to EN 60529.
•The outer diameter of the connecting cable must be adapted to within the sealing range of the
cable entry (small: 3...6.5 mm / 0.12...0.25" or large: 5...10 mm / 0.20...0.39").
•Unused cable entries are to be closed (>IP66 / 67).
Ensure that the gaskets and incised gasket ring are tight.

ELECTRICAL CONNECTIONS 4
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4.2 Power supply
The device does not require a separate power supply. The necessary supply for the control and
calibration unit and connected sensor is provided via the current output 4...20 mA (Loop 1, loop
powered).
The cable parameters are determined by the parameters of the system to which the loop
powered control and calibration unit and sensor are to be connected.
WARNING!
Substitution of components may impair intrinsic safety.
Figure 4-1: Overview of terminal connections
1 SMARTMAC 400
2 2. Current Output
3 2-wire device (Sensor)
4 Power supply with internal 250  HART® resistor
5 Power supply without internal 250  HART® resistor
6 Relay 1 / NAMUR output
7 Relay 2 / NAMUR output
8 Ground
9 HART® access point
LOOP2+
LOOP2-
FUNC. EARTH
SENSOR SHIELD
SENSOR+
SENSOR-
HART+
HART-
LOOP1+
LOOP1+
LOOP1-
RELAY1+
RELAY1-
RELAY2+
RELAY2-
J K FE S A1 B1 A2 B2
C
D E F G H I
U2+ U2- S Sens+ U1+ U1-
Sens- R1+ R1- R2+ R2-
UUUU
LOOP2+
LOOP2-
FUNC. EARTH
SENSOR SHIELD
SENSOR+
SENSOR-
HART+
HART-
LOOP1+
L
OO
P1+
LOOP1-
RELAY1+
RELAY1-
RELAY2+
RELAY2-
J K FE S A1 B1 A2 B2
D
E F G H I
U2+ U2- S Sens+ U1+ U1-
Sens- R1+ R1- R2+ R2-
UUUU
INFORMATION!
The device is galvanically isolated from ground and can be placed anywhere within the loop.

4 ELECTRICAL CONNECTIONS
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4.3 Grounding and equipotential bonding
If the device is not sufficiently electrostatically grounded via mounting, a ground connection
must be established using the FE connection 1 (functional earth). The position of the FE
connection is illustrated below.
4.4 Service connection
In order to avoid risks, always observe the following point when electrically connecting the
service connection:
•GDC - Plug
Only a programming device supplied by the manufacturer may be connected here.
The cover cap must be correctly mounted after removing the programming device.
Replace faulty cover caps.
4.5 Other connections
In order to avoid risks when electrically connecting these connections, observe:
•External HART® adapter
The external HART® adapter is accessible once the protection cap has been removed.
After the external HART® adapter has been disconnected, install the protection cap again.
Replace faulty protection caps.
Figure 4-2: Terminal compartment
1 Grounding terminal
LOOP2+
LOOP2-
FUNC. EARTH
SENSOR SHIELD
SENSOR+
SENSOR-
HART+
HART-
LOOP1+ 250
LOOP1+
LOOP1-
RELAY1+
RELAY1-
RELAY2+
RELAY2-
J K FE S A1 B1 A2 B2 C D E F G H I
INFORMATION!
It is prohibited to use the service connection of the device in a hazardous area.

OPERATION 5
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5.1 Start-up
Start-up is only permitted when the control unit:
•is correctly installed in the system and connected.
•has been checked for the proper state with regard to its installation and connection
requirements.
The operator of the system has to check prior to start-up, if the start-up was in compliance with
the national regulations for checks.
5.2 Operation
The control unit must be operated in such a way that it remains within the maximum and
minimum permissible temperatures and the electrical limit values.
The control unit may only be operated if the equipment parts necessary for safety are effective in
the long run, and are not rendered inoperable during operation.
The control unit may be operated during operation.
The control unit (protection type intrinsic safety) may even be opened in an energised state in
hazardous areas. Work on electrical connections is also permitted in an energised state.
Close the terminal compartment immediately after work has been completed. An external
HART® adapter is optionally available for configuration.
5.3 Electrostatic charge
In order to avoid ignition hazards due to electrostatic charge, control units shall not be used in
areas with:
•processes that generate strong charges
•mechanical friction and cutting processes
•spraying of electrons (e.g. in the vicinity of electrostatic painting systems)
•pneumatically conveyed dust is exposed
WARNING!
Electrostatic charging of the housing surface by friction must be avoided.
The unit shall be cleaned only with a moist cloth.

6 SERVICE
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6.1 Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorised representative or under the supervision
of authorised inspectors.
For systems in hazardous areas, regular checks are required in order to maintain the proper
condition.
The following checks are recommended:
•Check the housing, the cable entries and the feed lines for corrosion and/or damage.
Close the cover once maintenance work on the control unit has been completed.
6.2 Dismantling
In order to prevent injury or material damage when replacing the unit, always observe the
following:
•Before dismantling the electrical connecting lines of the device, ensure that all the cables
leading to the unit are de-energised themselves and to the reference potential of the
explosive area.

NOTES 7
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7 NOTES
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NOTES 7
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47058 Duisburg (Germany)
Tel.: [phone]
Fax: [phone]
[email protected]
© KROHNE 02/2022 - 4008424602 - AD SMARTMAC400 Ex R02 en - Subject to change without notice.
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