Hazardous Area Classifications and Protection Methods

Hazardous Area Classifications and Protection Methods
W H I T E PA P E R
Addressing Hazardous Areas
Safety Requirements with Properly
Designed Intrinsically Safe and
Ex Approved HMIs and Panel PC
Solutions for the Oil & Gas Industry
By: Santiago Consunji
American Industrial Systems, Inc. | www.aispro.com
CONTENTS:
Executive Summary:
This technical paper will explore the basics of
fire and explosion safety issues, legislation,
regulations and standards around the world, and
compare the Class/Division Hazardous Location
versus Zone Hazardous Area Classifications and
Protections primarily for Oil & Gas Refineries,
Chemical Processing and Transport Operations.
Moreover, this paper will present AIS’s
considerable expertise in designing industrial
control and monitoring solutions for installation
and use in hazardous areas and classified
locations. AIS’s broad range of Non-Incendive
(NI), Intrinsically Safe (IS), and Explosion Proof
Industrial Human Machine Interface (HMI)
Embedded Systems, including Industrial Touch
Panel PCs, Thin Clients and Ruggedized
Monitors are designed, manufactured, tested,
certified, UL listed and CE Ex marked for
use in hazardous areas and classified locations
in Oil & Gas, Petro-Chemical Processing &
Refining Operations.
Executive Summary
Abstract
1
2
1.Understanding the Basic Requirements for an Explosion
Three Factors Causing Fires and Explosions
Areas of Concern
2
2
2
2. Legislative Basis and Standards
3
3. Design Regulations
ANSI/ISA - 12.12.01-2012
4
4
4. Definitions and Comparisons
Class/Division Systems Basics
Zone System Basics
Zone System Table and Comparisons
Diagram: Comparing Classes/Divisions System
5
5
5
6
7
5.Installing and Operating Electrical Equipment
“Intrinsically Safe” Definition & Categories
8
8
6.Oilfield Equipment and Service Market
Service and Equipment Companies Revenues in Billions
Driving Factors in the Oil and Gas Industry and Market
9
9
10
7.AIS Oil and Gas HMI Solutions Overview
Features and Benefits
Common Applications
Certifications/Approvals
10
11
11
12
AIS Ex HMIs and Panel PCs ATEX Zone 2 Class 1 Div 2 Chart 13
CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
W H I T E PA P E R
Abstract:
Safety issues are of the most serious concern in all companies. Industrial plants, oil and gas refineries, oilfield equipment
and services and other types of facilities all around the world put forth a massive effort and investment to prevent safety
issues at all costs, especially in hazardous areas and classified locations. Areas with the storage of combustible gases,
vapors, mist and dust create dangerous environments. Some electrical equipment by its nature, when combined with
certain conditions pose dangers in hazardous areas where gases, vapors and dust might be present in sufficient quantity
or volume.
At the top of the list of all safety issues to prevent in plants are fires and explosions. To this end, AIS invests a tremendous
amount of capital, energy and resources to earn certifications and comply with electrical equipment regulations and
standards set forth by different countries, testing centers and governing bodies for designing and manufacturing
electronic control, operation and monitoring equipment for use specifically in hazardous area and classified locations.
1. Understanding the Basic Requirements for an Explosion
Legislation for standards revolve around educating, guiding and enforcing manufacturers and plant owners to design
and produce electrical equipment that adhere to acceptable levels of electrical safety to help prevent explosions in
areas that are deemed hazardous. More specifically, these regulations and standards also aim at minimizing the
contributing factors that lead to causing fires or explosions in plants and facilities. Some products by their basic nature
have incendive properties. Non-incendive circuits are those that may spark under normal operating conditions, but
may not release enough energy to cause ignition. Consider a basic light switch in a home may emit a small harmless,
visible spark. In a normal atmosphere, this arc is of no concern or immediate danger. In an atmosphere filled with
flammable gases, vapors or combustible dust, this arc may ignite a fire or cause an explosion. Electrical equipment
intended for use in chemical plants, oil and gas refineries and operations are designed to either contain an explosion
within the device, or not release sufficient energy to trigger and/or ignite an explosion.
Before delving into the depths of legislation standards and codes, let us gain an understanding on the basics of the
topic regarding “explosions”. First, what is an explosion, what causes them and where do they commonly occur? An
explosion is defined as a sudden reaction involving a rapid physical or chemical oxidation reaction or decay generating
an increase in temperature, or pressure or both simultaneously.
In the world of industrial facilities and
plants, there are three primary areas
of concern with electrical equipment,
and what they may produce or lead
to in a hazardous environment.
In order for an explosion to take place in
atmospheric air, three factors must be present
and coincide with each other at the same
time. The first two factors need to be
present in sufficient quantities to form
an explosive atmosphere.
The Three Factors that Can
Cause
Fires and Explosions
Areas of Concern for Electrical
Equipment in Plants and
Refineries
that Produce
1) Flammable substance 1) Arcs and sparks
2) Oxygen (air) 2) High temperatures
3) Source of Ignition
3) Electrical equipment failure
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2.
Legislative Basis and Standards for Explosion-Proof
Electrical Equipment Around the World
technology and the ever increasing demands for better
safety in the work place. Suffice to say, HMI companies
and other manufacturers of other electrical equipment
must be steadfast in staying abreast of the latest changes
and revisions and incorporate them and modify their
products as needed.
Technical standards for the area of explosion
protection and safety are legislated worldwide.
Explosion protection standards are established by
legislatures of individual countries for their respective
localities and regions. Therefore, manufacturers of
HMIs, OITs, displays, panel PCs and other electrical
products have to address and consider each of these
standards and incorporate the necessary safety
features in order to make their products suitable for
installation and use worldwide. It is also important to
note, technical standards are subject to constant
review and modification, due in part to advances in
There are several marks and/or stamps of approval that
represent where electrical products have been tested,
certified and approved and meet proper standard codes
of safety as published by various regulating bodies,
groups and testing centers.
From an overview perspective, the governing regulating bodies or groups for setting
standards for electrical safety and explosion protection by area of region or country include:
REGION/COUNTRY
MARKING
LEGISLATIVEBASISANDSTANDARDS
International
IEC Ex System, Ex areas can be known by different names such as “Hazardous Locations,” “Hazardous
Areas,” “Explosive Atmospheres,” and the like relate to areas where flammable liquids, vapours, gases
or combustible dusts are likely to occur in quantities sufficient to cause a fire or explosion.
Europe
The standards for explosion protection valid in the European Union are created on the basis of the
EU directives under the leadership of the European committee for Electrotechnical Standardization
(CENELEC 60 079). EN 60079 and EN 61241 specifically cover the area of explosion protection.
CENELEC only define standards in parallel with the IEC. The CE mark is complemented with the Ex
mark, followed by indication of the Group, Category, and if Group II equipment, the indication relating
to gases (G) or dust (D). There are also ATEX directives. These EU directives describe what equipment
and work is allowed in environments with an explosive atmosphere. ATEX 95 equipment directive 94/9
EC is for equipment and ATEX 137 workplace directive 99/92/EC is for worker safety.
North America
In North America, testing for electrical equipment deemed suitable for hazardous areas are performed
by nationally recognized testing laboratories such as UL, MET, FM, CSA or Intertek (ETL). The label will
always list the Class(es), Division(s) and may list the Group(s) and temperature Code. Directly adjacent
on the label one will find the mark of the listing agency. The American National Standard Institute
(ANSI) is a non-profit organization that coordinates US standards with international standards, so
that American products can be used worldwide. Other important published standards for electrical
equipment include: API RP 505 (zone system) and OSHA for the USA.
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3.
Design Regulations for Explosion-Proof Electrical Equipment
Manufacturers and operators of electrical equipment
must comply and strictly adhere to these regulations.
Compliance to these regulations are monitored by
accredited test houses such as UL and many other
testing houses previously listed. Regulations are
created to help companies design, engineer and
manufacture safe, explosion-protected electrical
equipment. Once a company successfully completes
and passes all testing, test centers issue conformity
certifications. The conformity certificates state that
uniform safety conditions have been met for explosion
protected electrical equipment and the equipment
manufacturer can now proceed to production.
While there seems to be much crossover in definition
and meaning, a distinction should be made between
regulations and standards. Regulations are mandatory
by law, where standards are typically voluntary, but often
demanded and/or strongly encouraged.
However, failing to comply with an established
standard may lead to a host of problems which may
be regulatory compliance, legal and liabilities issues.
Regulations for hazardous locations by means of the
Class/Division system have now been formulated by
the NEC, CEC, OSHA, and the National Fire Protection
Association (NFPA).
ANSI/ISA - 12.12.01-2012 Non-Incendive Standard Defined for Electrical Equipment
American National Standards Institute
(ANSI) and the International Society
of Automation (ISA) have worked on
defining the ANSI/ISA - 12.12.01-2012
Non-Incendive Standard for electrical
equipment for use in specific
hazardous locations.
This standard provides the minimum
requirements for the design,
construction and marking of electrical
equipment or parts of such equipment
for use in Class I and Class II, Division
2 and Class III, Division 1 and 2
hazardous (classified) locations.
The equipment may contain electronic
components that operate at
incendive levels and may also have
field wiring that is incendive. In
normal operation, the equipment is
not capable of causing ignition of the
surrounding atmosphere under the
conditions prescribed in the standard.
In addition, it is the intent of this
ANSI/ISA standards document to
establish uniformity in test methods
for determining the suitability of the
equipment and associated circuits and
components as they relate to potential
ignition of a specific flammable gas or
vapor-in-air mixture, combustible dust,
easily ignitable fibers, or flyings.
In addition, the standards apply only
to equipment, circuits, or components
designed and assessed specifically for
use in Class I, Division 2, hazardous
locations, as defined by the National
Electrical Code NFPA No. 70.
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4.
Definitions and Comparisons of Class/Division vs. Zone System
Shown below are a basic description, summary and comparison of the Class/Division system and the Zone system.
In the United States and North America, most
manufacturers generally follow the standard as
established by the National Electric Code (NEC). The
NEC categorizes hazardous locations (also referred to
has “Hazlocs”) into Classes and Divisions. Most other
countries follow standards detailed by the International
Electrontechnical Commission (IEC).
Class/Division Systems Basics
The Class/Division standards are the dominant method
for designing and manufacturing products in North
America. The explanation and details of this system are
comprehensive and more complex that what will be
covered in this paper. There are five definitions that
summarize Classes/Divisions. Here are brief descriptions
and explanations for each category.
The IEC classifies “Hazlocs” by specific Zones. Again,
Europe (EU) has its own classification system based on
the IEC classifications, known as ATEX directives.
CLASS/DIVISION SYSTEMS
DEFINITION
Area
Provides a brief description of the hazardous material that may be present and the probability that it is
present. The proper equipment may be selected and safe installation practices may be followed.
Class
Three categories of hazardous materials are designated by Classes and are defined by the NFPA Publication
70, NEC and CEC. The Classes define the type of explosive or ignitable substances which are present in
the atmosphere.
ClassI: Locationswhereflammablevaporsandgasesmaybepresent
ClassII: Locationswherecombustibledustmaybefound
ClassIII:Locationswhereignitablefibersorflyingsmaybepresent
Division
The classes described above are subdivided into two Divisions for further clarification, classification and
identification: Divisions I and Division II. The two divisions define the likelihood of the hazardous material
being present in a flammable concentration.
Group
Class I and Class II Divisions are further subdivided into Groups of hazardous material considering air mixtures
of gases, vapors, or dusts vary. The Groups define substances by rating their flammable nature in relation to
other known substances.
TemperatureClass
The temperature class definitions are used to designate the maximum operating temperatures on the surface
of the equipment, which should not exceed the ignition temperature of the surrounding atmosphere.
Zone System Basics
As mentioned, the Class/Division system
is predominantly used in North America to
designate and define hazardous conditions
and locations and provide guidelines for
the design and manufacture of electrical
equipment. Outside North America, the
Zone system is more commonly used and
followed. Similar to the Class/Division
system, it has definitions and categories
of hazardous atmospheric
situations and environments.
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CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
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ZONE SYSTEM
Flammable Gases
and Vapors
DEFINITION
Flammable gases and vapors, it defines or separates them into three dimensional spaces or regions.
Therefore, there are three primary zones or categories in the Zone system. It designates them as hazardous
locations on account of the explosive gas atmosphere that is expected to be present. Each zone requires
different considerations and precautions for the design, construction, installation and use of the electrical
equipment in these hazardous areas. Based upon the frequency of occurrence and duration of an explosive
gas atmosphere, the hazardous areas are divided into three separate zones.
Zone 0: An explosive gas atmosphere that is almost continuously present and for long periods of time.
Zone 1: An explosive gas atmosphere will likely to occur in normal operation on a consistent basis.
Zone 2: An explosive gas atmosphere that is not likely to occur in normal operation, but if it does
occur, it will most likely appear for only a short period of time.
A fourth zone is designated as a non-hazardous area. It is a safe area or location where an explosive
atmosphere is not expected and most likely is not present.
Flammable Dust
Flammable dust when suspended in air can explode. For this reason, the following has been established for
hazardous areas in which an explosive atmosphere in the form of a cloud of combustible dust in the air may
be present and considered dangerous.
Zone 20: Present continuously, or present for long periods time or frequently.
Zone 21: Likely to occur, occasionally, in normal operation.
Zone 22: Not likely to occur in normal operation, but if it does occur, it will persist for a short
period only.
Similar to the Class/Division system, there is another range of qualifiers that subdivide each of the zones. Since
combustion will only occur if the flammable mix of fuel (gases and vapors) and air (oxygen) is within certain dangerous
limits, they are further divided into two specified limits or ranges. The Lower Explosive Limit (LEL) sometimes called
Lower Flammability Limits (LFL) and the Upper Explosive Limit (UEL). As indicated the whole range from low to high is
considered dangerous, but vary in levels of severity. Let it also be known there is class system for temperature as well.
Finally, with regard to comparing the Classes/Divisions vs. the Zones system, the obvious question one may have is
whether one system may be better, or more suitable and comprehensive than the other? The definitive answer is “no”.
Both systems are professional regulations and standards that are designed to accomplish the same safety goals for
hazardous locations, but offer different language, definitions, classifications and categorizations. They are primarily
separated by their geographical preferences and locality.
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CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
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Comparing Classes/Divisions System with Zone System
To simplify understanding the differences and similarities between the two systems used in North America,
Europe and other parts of the world, below is a diagram visually identifying the various atmospheric situations
and environments in hazardous areas. The diagram also shows how the Class/Division system and the Zone
system classify and define them.
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CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
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5.
Installing and Operating Electrical Equipment in Hazardous Areas
Finally, planned and scheduled service, monitoring
and maintenance to maintain the safety of electrical
systems in hazardous areas within a plant is critical in
minimizing risks.
Manufacturers, installers and plant owners each have
tasks and obligations in their mission to achieve
maximum safety in the facility. Without all three working
harmoniously toward these goals, safety issues and
problems are likely to occur in hazardous locations.
Suggested Plant Operator Service
and Maintenance Guidelines
Obligations of HMI Manufacturers,
Installers and Plant Owners
1. The operator must maintain systems at a proper
operating state
2. Continuously monitor the electrical system for
performance or faults
3. Immediately execute any maintenance measures
required to remedy problems
4. Properly operate the system within stated
limits of operation
5. Cease operations immediately in case a problem
becomes an eminent hazard
u
Manufacturers: Develop HMI equipment for
intended use in hazardous areas
u
Installers: Select and install properly approved HMI equipment for the application
u
Plant Owners: Conduct safe operation,
monitoring and maintenance of HMI equipment
There are a few primary considerations when installing
and operating electrical equipment in hazardous areas.
First, installation and erection regulations and standards
as specified in EN60079-14 and national regulations
apply and need to be followed. As for more specifics
on installation, three installation systems are used for
electrical systems in hazardous areas and locations.
For cable and conduit equipment installation in
hazardous areas, installers must observe proper
procedures for inserting/running cable systems with
indirect cable inlets, direct cable inlets and/or
conduit systems.
“Intrinsically Safe” Equipment Defined
and Categories
“Intrinsic Safety” is a type of protection where electrical
equipment does not have a sufficient amount of energy to
ignite a potentially explosive atmosphere. In an intrinsically
safe circuit, no sparks or thermal effects occur in operation,
or in the event of a fault will not ignite a fire or explosion.
Intrinsic safety is achieved by limiting the current and
voltage in a circuit. This is primarily the case for lower
voltage type products, such as control technology and
industrial HMI monitors and displays.
Other Key Things to Know About Intrinsically Safe Designed Products
u
Intrinsically safe products and parts are divided into categories for safety levels
u
Safety levels depend on the safety requirements when designing the equipment
u
Isolating transformers and amplifiers between intrinsic and non-intrinsic equipment provide the
necessary limiting to minimize the possibility of ignition
u
All devices in an intrinsically-safe circuit must correspond to the intrinsically safe type of protection.
u
Typically transmitters, sensors and the wiring requires that the characteristic electrical values are
maintained to ensure intrinsic safety
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CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
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6.
Oilfield Equipment and Service Market
According to a new market report published by
Transparency Market Research Oilfield Equipment Market;
Drilling Equipment, Field Production Machinery, Pumps
and Valves and Other – Global and US Industry Analysis,
Size, Share, Growth, Trends and Forecast, 2012–2018,
the global market for oilfield equipment was valued at
US$93.74 billion (B) in 2012 and is expected to reach
US$117.37B in 2018, growing at a CAGR of 3.8% from
2012 to 2018.
Driven primarily by the rising oil extraction and refining
activities coupled with increasing regional consumption
and its growing demand across the globe, the demand
for oilfield equipment is expected to grow. A shift toward
unconventional oil fields, such as shale gas, has been
driving the demand for oilfield equipment in both
developed economies such as the US and Europe and in
emerging markets such as Asia Pacific and Latin America.
This trend is expected to drive the demand over their
forecast period.
valued at US$29.05B in 2012 and is expected to reach
US$36.66B in 2018, growing at a CAGR of 3.9% from
2012 to 2018.
Drilling equipment was the largest market segment,
accounting for over 70% of the total oilfield equipment
consumption in 2012. According to the report, North
America emerged as the leading consumer of oilfield
equipment and accounted for over 40% of the global
demand in 2012. US market for oilfield equipment was
Asia Pacific is expected to be the fastest growing market
for oilfield equipment, growing at a CAGR of 4.3% from
2012 to 2018. The growth of exploration and production
in China, the implementation of licensing bidding in India,
and the introduction of new policies in Indonesia have
been major factors driving market growth in the region.
The World’s Biggest Publicly Traded Oil Service and Equipment Companies Revenues in Billions
Schlumberger 42.32 B
Halliburton 28.5 B
Baker Hughes 21.36 B
National Oilwell Varco 20.04 B
Seadrill 19.74 B
Tenaris 11.07 B
Transocean 9.2 B
Cameron International 8.5 B
Ensco 6.85 B
China Oilfield Services 3.5 B
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CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
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Driving Factors in the Oil and Gas Industry
and
Market Through 2018
u
2013 demand for oil in the developing world will
overtake that in industrialized countries for the very first
time, driven particularly by strong demand from China,
India and other developing nations across Asia which
continue to see strong economic growth.
u
The shale revolution had transformed the US energy
sector, and is now sweeping the wider world too. If its
impact elsewhere is anything like we have seen in the
US – in just a decade shale gas has risen from 2 percent
of natural gas production to 37 percent – then the
ramifications are going to be significant.
In particular “directional drilling” has transformed
u
u
Regulatory policies and geopolitical issues are some
the fortunes of many oilfields, while the industry has also
seen huge strides in the scale and sophistication of
subsea pipeline systems and deep-water production.
of the major concerns that are expected to affect the
oilfield equipment market.
u
Oilfield services market represents $750 billion a
u
Global production of gas is already growing at
year and the growth of its leading players continues to
be driven by a mix of technological breakthroughs, the
willingness of oil majors to outsource production and
reduce their exposure to aging reserves, and by
increasing demand from state-owned oil firms.
roughly twice the rate of oil, while global demand for
gas could rise by as much as 50 percent between 2010
and 2035.
u
Technological advances such as horizontal drilling
u
The oil and gas market will continue to remain a very
and hydraulic fracturing, along with 3D seismology are
now also making it possible to develop oil in reserves
previously
thought of as commercially unavailable.
7.
attractive play for M&A activity this year, particularly as
companies look to expand.
AIS Oil and Gas HMI Solutions Overview for Use in
Hazardous Areas and Classified Locations
AIS offers a wide range of Non-Incendive (NI),
Intrinsically Safe (IS), and Explosion Proof Industrial
Human Machine Interface (HMI) Embedded Systems,
including ruggedized monitors and integrated display
computers. As reference, other HMI terminology include:
industrial panel PCs, industrial panel computers,
operator interface terminals, thin clients, industrial
monitors and displays with rugged touch screen interface
and/or multi-touch Projected Capacitive Touch (PCT or
PCAP) technology. Take your HMI, control and monitoring
solutions to the next level with open embedded
architecture, advanced performance and connectivity, in
an all-in-one and rugged industrial design, all of which
AIS manufactures in-house for hazardous areas and
classified locations.
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CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
W H I T E PA P E R
These industrial HMI embedded systems, monitors
and displays for hazardous areas are constructed
with completely sealed, stainless steel type
4/4X, IP 65/66, NEMA 4/4X enclosures with
environmental ratings (UL 50 or IEC 529) on the
entire system including fully sealed I/O ports.
The hazardous area panel PC supports wide
operating temperatures from -20 to 60°C (-4 to
140°F), and comes with pre-installed Windows
Embedded or Linux operating system; and is
powered by high-performance and low power
consumption (TDP 3.5W) Intel® embedded
processors in fanless, industrial-grade, high bright
LCD flat touch screen panels (with option for
sunlight readable LCD displays).
AIS Non-Incendive (NI), Intrinsically Safe (IS), and
Explosion Proof panel PCs, thin clients, and
industrial monitors with HMI open platforms are
designed and certified to meet NEC/CEC Class/
Division, ATEX Directive 94/9/EC, and IECEx Zone
standards for increased safety in industrial HMI
touch screen PCs in Division 2 and Zone 2 operator
control and monitoring applications.
AIS offers UL Class I Division 2 (C1D2 or Class I Div
2), Groups A, B, C, D, T4, ATEX 94/9/EC Zone 2
Category 3, and IECEx Zone 2, Ex “nA” and Ex “ic”,
T4 certification on its Hazardous Areas panel PCs &
monitors and Hazardous Locations (Hazlocs) panel
computers & displays which are primarily designed
for the demanding Environmental, Health
and Safety (EHS) requirements, and volatile &
harsh environments of Oil, Gas, and Petrochemical
manufacturing industries; oilfield equipment &
services, drilling systems automation, drilling
control rooms, drill monitors, drilling management
systems, local instrument rooms, machinery
control systems, process control systems,
intelligent well systems, upstream, midstream
and downstream automation, remote monitoring
and control panel applications that provide
accurate, economical, intuitive and user-friendly
systems control, operation and monitoring.
Features:
uUL Listed to Safety Standards: ANSI/ISA 12.12.01, 2012, Nonincendive Panel PC for Use in Class 1, Division 2
Groups A, B, C, D Hazardous (Classified) Locations and
CAN/CSA C22.2 No. 213-M1987 for Use in Class 1,
Division 2 Hazardous Locations: UL File # E365958
uUL Listed to Safety Standards: UL 60950-1 and CSA C22.2 No. 60950-1-07: UL File # E320439
uCE Ex Marked: Explosive Atmospheres (ATEX)-Directive 94/9/EC: Complying with the Essential Health and Safety
Requirements that relate to the design of Category 3 Zone
2 Panel PC, certified to ATEX Protection Classes- “CE Ex
mark” II 3 G Ex nA ic IIA T4
uCompliance with the Essential Health and Safety
Requirements has been assured by Compliance with IEC
60079-0, IEC 60079-11, and IEC 60079-15
Benefits:
uHazardous areas panel PC for improved environment
for operators
uHazardous locations panel PC for improved
operator safety
uHigh-availability integrated rig HMI panel PC for
managing, controlling, and monitoring rig floor
equipment in independent and activity-based operation
uThe panel PC is ideal for operator control and
monitoring, measuring and testing as well as data
collection, communication and other applications in hazardous zones 2
uOpen HMI with pre-configured operating system for all types of software applications
uFanless, streamline enclosure design for highly efficient heat dissipation
Common
Applications Include:
uOilfield Equipment & Services
uDrilling Systems Automation, Control Rooms,
Drill monitors and Drilling Management Systems
uLocal Instrument Rooms
uMachinery Control Systems
uProcess Controls Systems
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CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
W H I T E PA P E R
Standard or custom HMI applications are designed to meet Class I and II, Division 2 and Class III, Divisions 1 and 2
Hazardous (Classified) Locations (North American Classification), and Zone 1/21 and 2/22 Hazardous Areas (European
and IEC Classification) specifications.
Certifications/Approvals
u
North American Approvals: Underwriters Laboratories (UL) and
Canadian Standards Association (CSA)
u
European Approvals: ATEX 95 equipment directive 94/9/EC
u
International Approvals: IEC Ex System, Ex areas can be
known by different names such as “Hazardous Locations,”
“Hazardous Areas,” “Explosive Atmospheres,” and the like
and relate to areas where flammable liquids, vapours, gases
or combustible dusts are likely to occur in quantities
sufficient to cause a fire or explosion. IEC System for
Certification to Standards relating to Equipment for use
in Explosive Atmospheres
AIS “Intrinsically Safe” Industrial Panel PC and Monitor
Are Suitable For These Hazardous Area Classifications and Protections
CATEGORY
REGION
CLASS/DIVISION/ZONERATING
TEMPERATURE
Industrial
Panel PC (1)
United States
“UL Listed”
Class I Division 2,
Groups A, B, C, D T4
Class I Zone 2, IIA, T4
-20°C to 60°C
(-4°F to 140°F)
Canada
“UL Listed”
Class I Division 2,
Groups A, B, C, D T4
Class I Zone 2, IIA, T4
Europe
“CE Ex
Marked”
Industrial
Monitor (1)
ATEX II 3 G, Ex nA ic IIA Gc
ATEX Zone 2 Category 3 Gas
United States
“UL Listed”
Class I Division 2,
Groups A, B, C, D T4
Class I Zone 2, IIA, T4
Canada
“UL Listed”
Class I Division 2,
Groups A, B, C, D T4
Class I Zone 2, IIA, T4
Europe
“CE Ex
Marked”
-20°C to 60°C
(-4°F to 140°F)
ATEX II 3 G, Ex nA ic IIA Gc
ATEX Zone 2 Category 3 Gas
(1)
Model Series HAR15XXXXXXXXXXXXXX (X=A~Z, a~z, 0~9, “-“, Blank or Slash for marketing purpose only, and no impact safety related constructions and critical components)
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CLASS/DIVISION HAZARDOUS LOCATION • ZONE HAZARDOUS AREA
Classification of hazardous areas
USA NEC 500
Class I (gas)
Classes and groups according to NEC 500
Rare or
temporary hazard
Typical types
of gas
Group
Division 2
Acetylene
Class I
Group A
Hydrogen
Class I
Group B
Ethylene
Class I
Group C
Propane
Class I
Group D
NEC 500
Class I
IEC
CENELEC
II 3 G
Temperature classes
Maximum surface
temperature
USA
(NEC 500)
135 °C
T4
Division 2
Groups A, B, C, D
T4
Ex
nA, ic
IIA
T4
G
Ex
nA, ic
IIA
T4
G
Explosion groups according to
CENELEC, IEC, NEC 505
Explosion group
Typical gas
II A
Propane
Classification of gases and vapors in
explosion groups and temperature classes
T4
II A
Protection types for electrical equipment
in explosive gas atmospheres
Type of
protection
Ex
General
requirements
Acetyl aldehyde
Ethyl ether
Standard
Title
Scope
EN 60079-0
IEC 60079-0
ANSI/ISA/
UL 60079-0
Part 0: Equipment
General
requirements
The general requirements for
construction, testing and
marking of electrical equipment
and Ex Components intended
for use in explosive atmospheres
Temperature classes
Maximum surface
temperature
CENELEC
IEC
USA (NEC 505)
135 °C
T4
Intrinsic
safety
i
EN 60079-11
IEC 60079-11
ANSI/ISA/
UL 60079-11
Explosive
atmospheres
Part 11: Equipment
protection by
intrinsic safety “i”
The construction and testing of
intrinsically safe apparatus
intended for use in an explosive
atmosphere and for associated
apparatus, which is intended for
connection to intrinsically safe
circuits which enter such
atmospheres
Types of
protection
n
EN 60079-15
IEC 60079-15
ANSI/ISA/
UL 60079-15
Electrical apparatus
for explosive gas
atmospheres - Part
15: Construction,
test and marking of
type of protection
“n” electrical
apparatus
The requirements for the
construction, testing and marking
for Group II electrical apparatus
with type ofprotection, “n”
intended for usein explosive gas
atmospheres. This part is
applicable to non-sparking
electrical apparatus and also to
electrical apparatus with parts
or circuits producing arcs or
sparks or having hot surfaces
Zone classification
Rare or short-term hazard
CENELEC/IEC
USA
Zone 2
NEC 500
Class I (gas)
Zone 2
Equipment group II (other hazard areas)
Category 3
Hazard level
Rare or short-termhazard
Application in
Zone 2
Atmosphere
G = gas
G
Use in
Zone/equipment
protection level
Ga
Gb
Gc
n
n
n
n
Gc
Protection level
Increased protection level
Use in
Zone 2
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This paper is not meant to substitute or replace studying and comprehensively reviewing and complying to all the necessary electrical
safety standards, certifications, approvals and guidelines for hazardous areas and classified locations. It is only an introductory primer
relating to the topics of safety, hazardous issues, safety standards and options. Please consult with your internal safety department or group
for the latest and updated electrical safety standards, certifications, approvals and codes information.
13
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