KROHNE SMARTPAT PH 8 Series Wiring diagram

Digital pH sensors
Equipment protection level
Ga
SMARTPAT PH 8XXX
SMARTPAT PH 8XXXSMARTPAT PH 8XXX
SMARTPAT PH 8XXX Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 04/2019 - 4004005203 - AD SMARTPAT PH 8xxx NEPSI R03 en

CONTENTS
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SMARTPAT PH 8XXX
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 NEPSI conformity ............................................................................................................. 3
1.3 Safety instructions............................................................................................................ 4
2 Device description 5
2.1 Device description ............................................................................................................ 5
2.2 Description code............................................................................................................... 5
2.3 Marking............................................................................................................................. 6
2.4 Flammable products ........................................................................................................ 7
2.5 Equipment protection level .............................................................................................. 8
2.6 Protection type for gas hazardous areas......................................................................... 8
2.7 Temperature classes........................................................................................................9
2.8 Autoclavability .................................................................................................................. 9
2.9 Electrical data................................................................................................................. 10
3 Installation 11
3.1 Installation...................................................................................................................... 11
4 Electrical connections 12
4.1 General notes ................................................................................................................. 12
4.2 Power supply .................................................................................................................. 12
4.3 Inputs/outputs ................................................................................................................ 12
4.4 Grounding and equipotential bonding............................................................................ 13
5 Operation 14
5.1 Starting up for the first time .......................................................................................... 14
5.2 Operation ........................................................................................................................ 14
5.3 Electrostatic charge .......................................................................................................14
6 Service 15
6.1 Maintenance ................................................................................................................... 15
6.2 Dismantling .................................................................................................................... 15

SAFETY INSTRUCTIONS 1
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1.1 General notes
This additional Ex instruction applies to intrinsically safe versions of the digital pH-sensors. It
completes the standard documentation for non-explosion protected versions.
The information given in this instruction 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 NEPSI conformity
SMARTPAT PH8 series digital pH-sensor has been certified by National Supervision and
Inspection Center for Explosion Protection and Safety of Instrumentation (NEPSI). This product
is in accordance with the following standards:
•GB 3836.1-2010 Explosive atmospheres-Part 1: Equipment-General requirements
•GB 3836.4-2010 Explosive atmospheres-Part 4: Equipment protection by intrinsic safety "i"
•GB 3836.20-2010 Explosive atmospheres-Part 20: Equipment with equipment protection
'level (EPL) Ga
The certificate number is:
This certification together with its boundary conditions is required to be observed without fail.
GYJ19.1119X
GYJ19.1119XGYJ19.1119X
GYJ19.1119X
INFORMATION!
The Ex marking is NOT acc. to the ATEX directive. Placing the product on the market of the EU for
purpose of distribution and/or use in the EU is NOT permitted.

1 SAFETY INSTRUCTIONS
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1.3 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!
For installation, use and maintenance of SMARTPAT sensors, observe the following standards:
During installation. operation and maintenance, users shall comply with the requirements of the
product instruction manual and with the relevant standards.
Relevant standards
•GB 3836.13-2013 "Explosive atmospheres - part 13: Equipment repair, overhaul and
reclamation"
•GB/T 3836.15-2017 "Explosive atmospheres - part 15: Electrical installations design,
selection and erection"
•GB/T 3836.16-2017 "Explosive atmospheres - part 16: Electrical installations inspection and
maintenance"
•GB 50257-2014 "Code for construction and acceptance of electric device for explosion
atmospheres and fire hazard electrical equipment installation engineering"
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.

DEVICE DESCRIPTION 2
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2.1 Device description
The pH sensor is designed to measure pH in liquids. It has a connection for a 4...20 mA current
output with HART
®
communication.
The connection is designed as a plug connector and at the same time supplies the sensor with
power.
The PG connection is used as process connection
2.2 Description code
The safety description code of the pH sensors is made up of the following elements (spaces in
the code may be omitted):
SMARTPAT PH 8ab0
SMARTPAT PH 8ab0SMARTPAT PH 8ab0
SMARTPAT PH 8ab0
Versions available are: SMARTPAT PH 8150, PH 8320 and PH 8570.
1 Nickel-plated brass body with VP2 connector
2 PG 13.5 thread
3 Washer
4 O-ring
5 Glass shaft
6 Diaphragm
7 Membrane glass
Feature a
aa
a
Type of diaphragm
Feature b
bb
b
Field of application
a
aa
a = 1: Open (hole) b
bb
b = 2: Industrial wastewater
a
aa
a = 3: PTFE b
bb
b = 5: Chemical
a
aa
a = 5: Ceramic b
bb
b = 7: Pharma

2 DEVICE DESCRIPTION
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2.3 Marking
The marking of the devices in accordance with the description code is shown on the nameplates
below. The main plate is on the main part of the device and there is an additional marking on the
glass.
Figure 2-1: Example nameplate NEPSI
1 Manufacturer
2 Type
3 TAG number, order code, serial number D xxxxxx = Year of manufacture
4 Ex data acc. to GYJ14.1048X
5 Date of manufacture
6 Observe the installation and operation instruction
Figure 2-2: Marking on the glass shaft
1 Manufacturer
2 Type

DEVICE DESCRIPTION 2
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2.4 Flammable products
Atmospheric conditions:
Atmospheric conditions:Atmospheric conditions:
Atmospheric conditions:
The standard atmospheric conditions under which it may be assumed that Ex equipment can be
operated are:
•Temperature: -20...+60°C / -4...+140°F
•Pressure: 80...110 kPa (0.8...1.1 bar) / 11.6...15.9 psi
•Air with normal oxygen content, typically 21%v/v
Ex equipment operating outside the standard temperature range must be tested and certified
(e.g. for ambient temperature range -10...+85°C / -14...+185°F).
Ex equipment operating outside the standard atmospheric pressure range and standard oxygen
content is not permitted.
Operating conditions:
Operating conditions:Operating conditions:
Operating conditions:
The sensor operate outside the standard atmospheric pressure range, which means that
explosion protection, regardless of the zone assignment, is fundamentally not applicable for the
sensor (piping or vessel).
Figure 2-3: Position of the nameplates on the sensor
1 Nameplate on the sensor connector with ex data
2 Marking on the glass
WARNING!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up inside of the piping or vessel at the same time the atmospheric conditions are
exceeded.
The operator is responsible to ensure that the sensor is operated safely in terms of the
temperature and pressure of the products used. In case of operation with flammable products
the sensor must be included in the periodic pressure tests of the plant.

2 DEVICE DESCRIPTION
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2.5 Equipment protection level
The sensor is designed in EPL Ga for use in zone 0, zone 1 or zone 2.
For more information refer to chapter "Flammable products".
2.6 Protection type for gas hazardous areas
In type of protection "Intrinsic Safety" the sensor meets the requirements of the applicable
standards. The explosion protection is ensured by limitation of the current and voltage so that no
ignitable energy can occur.
The marking of the sensor is:
Ex ia IIC T4-T6 Ga
Ex ia IIC T4-T6 GaEx ia IIC T4-T6 Ga
Ex ia IIC T4-T6 Ga
INFORMATION!
Definition of zone 0:
An area in which an explosive atmosphere, as a result of the mixture of flammable substances in
the form of gas, vapours or mist with air, is continuously or for long periods or frequently
present.
Components of the Ex marking and their definition
Ex ia
Ex iaEx ia
Ex ia Intrinsically safe equipment, level of protection ia
IIC
IICIIC
IIC Gas group IIC approved, suitable for group IIA, IIB and IIC
T4-T6
T4-T6T4-T6
T4-T6 Temperature class range, suitable for temperarture class T1...T6
Ga
GaGa
Ga Equipment Protection Level (EPL) Ga, suitable for Zone 0, Zone 1 and Zone 2

DEVICE DESCRIPTION 2
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2.7 Temperature classes
The permissible temperature range depending on the temperature class of the sensor is:
2.8 Autoclavability
To kill off germs, the sensor may be stored in the autoclave at 140°C / 284°F for 20 minutes.
Temperature
class
Permissible ambient or product
temperature in [°C]
Permissible ambient or product
temperature in [°F]
T1 -10...+85°C14...+185°F
T2 -10...+85°C14...+185°F
T3 -10...+85°C14...+185°F
T4 -10...+85°C14...+185°F
T5 -10...+55°C14...+131°F
T6 -10...+55°C14...+131°F
The permissible product temperature range can vary depending on the sensor used. Consult the
standard documentation for this information.
INFORMATION!
The sensor is not operated in the autoclave. For more information consult the standard
documentation.

2 DEVICE DESCRIPTION
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2.9 Electrical data
Connect the sensor only to intrinsically-safe certified circuits. Observe the following maximum
values for the sensor when connecting:
•U
i
=30V
•I
i
= 120 mA
•P
i
=1.0W
•L
i
=10µH
•C
i
=5nF
The internal electrode circuit is limited to the following maximum values:
•U
o
=7.8V
•I
o
=10mA
•P
o
=20mW
CAUTION!
Capacity and inductance of the connecting cable have to be considered.
INFORMATION!
For information about nominal data and the HART interface consult the standard documentation.

INSTALLATION 3
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3.1 Installation
Mounting of the sensor
• Ensure that you use a gasket suitable for the dimensions of the process connection and the
requirements of the measuring point.
• Align the gasket correctly.
• Carefully lower the sensor into the provided assembly and afterwards into the tank or the pipe.
• Observe all the relevant regulations.
DANGER!
The manufacturer is not liable for any damage or injuries resulting from improper use or use
other than the intended purpose. This applies in particular to hazards due to insufficient
corrosion resistance and suitability of the materials in contact with product.
DANGER!
Installation 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 sensor.
• The device is accessible for any necessary visual inspections and can be viewed from all
sides.
• The nameplate is clearly visible.
• All gaskets are suitable for the intended use.

4 ELECTRICAL CONNECTIONS
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4.1 General notes
In order to avoid risks, always observe the following points when electrically connecting a
sensor:
•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.
•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 ≥500V
eff
).
4.2 Power supply
The sensor does not require a separate power supply. The required supply for the electronics is
provided via the 4...20 mA current output.
4.3 Inputs/outputs
The connector pin assignment of the sensor is described in the standard documentation. The
signal circuits of the sensor may only be connected to certified intrinsically safe slave units or
circuits. For more information refer to chapter "Electrical data".
INFORMATION!
When connecting the sensor cable, observe the standard documentation for the sensor, the
chapter "Installation" .
When using junction box SJB 200 W-Ex, the corresponding handbook must also be observed.

ELECTRICAL CONNECTIONS 4
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4.4 Grounding and equipotential bonding
To dissipate dangerous electrostatic charges the metal housing must be grounded. When
installing in pipes or vessels that are grounded, the electrical connection to earth is carried out
via the PG screw connection made of electrically conductive PEEK or metal
(SMARTPAT PH 8570).
If installing in pipes or vessels that are not grounded, the shield of the sensor cable must be
connected to the ground potential. The electrical connection to the metal housing and the
ground is made by the sensor cable with the VP connector.
When using junction box SJB 200 W-Ex, the shield of the sensor cable must be connected to the
shield connector provided for all SMARTPAT PH 8xxx. This will ensure sufficient electrostatic
grounding and at the same time prevent unacceptably high equalizing currents.
WARNING!
The cable shield must not be connected directly on both ends to the ground potential, since
unacceptably high equalizing currents can cause an explosion.
INFORMATION!
On junction box SJB 200 W-Ex, the shield connector is connected to the ground potential via a 1
megohms resistor and a capacitor in parallel.
The connections for the intrinsically safe 4...20 mA sensor circuit are galvanically isolated from
both the electrode circuit and the ground and can be considered ground-free (test voltage
500 V
eff
). It is accepted that the electrode circuit can be directly connected to the ground
potential.

5 OPERATION
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5.1 Starting up for the first time
To avoid injury and material damage, only operate the sensor under the following conditions:
•The equipment has to be installed and connected in accordance with the manufacturer's
instructions.
•At the operator's request, a check was conducted prior to start-up to ensure the correct
installation and connection.
•The check prior to start-up was in compliance with the national regulations for checks before
start-up.
5.2 Operation
To avoid injury and material damage, only operate the sensor under the following conditions:
•Temperatures, pressures and electrical limit values are in the manufacturer's specified
range.
•The equipment parts necessary for safety are effective in the long run, never disable them
during operation!
•Include the sensor in the periodic pressure tests of the plant when operating with flammable
products.
5.3 Electrostatic charge
In order to avoid ignition hazards due to electrostatic charge, the sensors may not be
used in areas where:
•processes that generate strong charges,
•mechanical friction and cutting processes,
•spraying of electrons (e.g. in the vicinity of electrostatic painting systems),
•dust carried by compressed air.
INFORMATION!
Observe the information regarding calibration in the standard documentation.
CAUTION!
When using the sensor, and in particular after connecting the connector, ensure that it is
connected properly. Otherwise the degree of IP protection is not guaranteed.

SERVICE 6
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6.1 Maintenance
For systems in hazardous areas, regular checks are required in order to maintain the proper
condition. The manufacturer recommends the following maintenance measures:
•Check the housing, the cable entry and the feed lines for corrosion and/or damage.
•Check the process connection and the piping connections for leakage.
•Check the entire sensor for dust deposits.
6.2 Dismantling
In order to prevent injury or material damage when replacing the sensor, always observe the
following points:
•Before dismantling the electrical connecting lines of the device, ensure that all the cables
leading to the sensor are de-energised themselves and to the reference potential of the
explosive area.
•All the relevant process pipes or containers must be depressurised before dismounting the
sensor.
•If the process pipes or the container contain products that are harmful to the environment or
to health, implement the appropriate safety measures before dismantling the sensor.
•Replace all the seals when reinstalling the device in the process pipe or container.
CAUTION!
Maintenance measures 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.

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Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.: [phone]
Fax: [phone]
[email protected]
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