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Ex Electrical Sensors for Hazardous Locations

October 10, 2018

Intrinsically Safe DC Current Sensor for Oil and Gas ApplicationsISC Intrinsically Safe Ex DC Current Sensor

The ISC current transducer(s) is a Hall-effect sensor with an integrated signal conditioner. All variations of units are packaged in a split-core configuration for ease of installation. Application flexibility is provided by a wide variety of input current ranges and output signal types. Units meet the requirements of ATEX Directive 2014/34/EU and UL/CUL Intrinsically Safe regulations (IECEx status pending). These standards are specifically related to the requirements for hazardous location installations in North America and the European Union (EU) but are widely accepted throughout the world. IECEx targets internationally to the world and all countries. When used with appropriate safety barriers these units are recommended for installation in hazardous locations such as offshore platforms and petrochemical plants.

What is an explosive (Ex) atmosphere?

An explosive atmosphere contains a mixture of dangerous substances in many forms such as gas, vapor, mist or dust, which, under certain conditions of temperature and pressure, has the potential to catch fire and explode. An explosive atmosphere only needs a source of ignition to cause an explosion.

Preventing releases of dangerous substances, which can create explosive atmospheres, and preventing sources of ignition, are two common ways of reducing the risk of danger in these hazardous locations. Several different standards define acceptable actions in both areas.

Those standards are promulgated by three different bodies, separated into geographic regions, which certify suitability for Ex. UL provides certification for the North American Region, while ATEX applies to and is a compulsory requirement of European Union (EU). IECEx targets internationally to the world and all countries.

OSI Ex Standards

Underwriters Lab (UL)

Most North Americans are familiar with the ubiquitous UL label on their appliances but many do not realize that UL also certifies compliance for industrial applications, including Ex environments. OSI transducers for Ex environments (e.g. ISC-201X5) are certified to UL-913, 7th Edition.


ATEX is mandatory in the EU only, and relates to the two European Directives for controlling explosive atmospheres:

  1. Directive 99/92/EC (also known as 'ATEX 137' or the 'ATEX Workplace Directive') focuses on requirements in improving the health and safety protection of workers potentially at risk from explosive atmospheres.
  2. Directive 94/9/EC (also known as 'ATEX 95' or 'the ATEX Equipment Directive') describes the laws of Members States regarding equipment and protective systems intended for use in potentially explosive atmospheres.

As a manufacturer, OSI focuses on delivering equipment to meet the applicable provisions of ATEX 95.

View ATEX quality documentation here


International standards IEC 60079 (Ex Manufacture) and ISO/IEC 80079-34 (Ex Quality), which are harmonized with EN European Directives, are hazardous area standards that are intended to operate globally across many national and regional jurisdictions. These requirements shape OSI’s design, quality and manufacturing practices of IECEx listed devices.

View IECEx quality documentation here

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