One of the most widely used industrial standards for the protection of electronic equipment, the ANSI/ISA-71.04 has been updated and approved as an American National Standard.
This revision was prompted more than 25 years since the standard’s original publication due to reliability issues experienced by manufacturers following the passage and implementation of a number of RoHS, or lead-free regulations.
According to Chris Muller, Chair of the ISA71 Committee that is responsible for this standard, the International Society of Automation (ISA) Standard 71.04-2013: Environmental Conditions for Process Measurement and Control Systems: Airborne Contaminants has been long due for an update. However, the implementation of RoHS regulations in 2006 and the undeniable link between the changes required to electronic equipment and the increasing number of failures attributed to corrosion – especially for information technology (IT) and datacom equipment used in mission critical applications – prompted a new call for a review.
The switch to lead-free manufacturing affected essentially all electronic products, and some of the more common materials used as replacements were particularly more sensitive to common atmospheric pollutants than lead-based materials. Manufacturers of industrial process control equipment have used ISA-71.04 since its initial publication for warranty compliance because they understood that their equipment had to be protected due to the corrosive nature of the environments in which it would be used. However, the same had not been the case for computer systems used in non-industrial settings.
The number and types of corrosion failures have increased dramatically around the world in locations with high pollution levels, and the most common failures have been with the most common components including hard disk drives (HDD), graphic cards, motherboards, DIMMs, capacitors, and transistors.
Research performed by many of the world’s leading IT equipment manufacturers including AMD, Cisco, Cray, Dell, EMC, Hitachi, HP, IBM, Intel, Seagate, SGI and Sun Microsystems led to the publication of an industry white paper detailing requirements necessary to manage contamination risks.
Muller explained that the rate of failures had become so severe in some locations that many of these same companies changed their products warranties to include requirements for the control of corrosion caused by gaseous contamination using ISA-71.04 as the basis for compliance. Their research efforts also provided much of the data needed to update the standard.
Dr Prabjit Singh, Senior Technical Staff Member in Materials Engineering for IBM observes the increase in the rate of failures of IT equipment in recent years due to corrosion has been mainly due to a combination of factors such as the change to ROHS-compliant hardware and the explosive growth of computer usage in emerging markets with heavily polluted environments.
He believes the revision to ISA-71.04 will help the IT industry greatly by specifying acceptable air quality in mission critical environments such as data centres.
Aamir Kazi, who works with the Development Reliability Engineering Group at Dell Computers, agrees that the new ISA-71.04 standard moves toward industry alignment to a common air quality specification, in the context of newer regulation-compliant materials and processes, which are more sensitive to contaminant levels.
After more than three years of effort from the ISA71 committee, ANSI/ISA-71.04-2013 was approved by the American National Standards Institute in August, 2013. The purpose of this new standard is to classify airborne contaminants that may affect electronic hardware, such as process measurement and control instruments, IT, telecommunications, networking and data centre equipment, and electronic office equipment. This standard covers contaminants that affect industrial process measurement and control equipment, electronic office equipment, data centre and network equipment, climate control such as heating, ventilating, and air-conditioning (HVAC) equipment.
Muller concludes that the 2013 edition of the standard has several new features and includes updates due to the changes required for electronic equipment based on RoHS or lead-free regulations that were originally passed into law in the European Union but have now been legalised in many other countries.