Accelerometers Obtain Hazardous-Area Certification

Wilcoxon Research has announced an additional intrinsically safe certification in accordance with IECEx requirements for six general-purpose accelerometers. The six accelerometers were approved for use in Class I Zone 0 hazardous areas. Tom Smith, vice-president of sales and marketing, said: 'These vibration sensors were previously approved as intrinsically safe by certifying agencies recognised in the US, Canada and Europe.

'Condition monitoring is growing in popularity across the world and the IECEx certification will help us better serve customers in other regions,' he added. Six general-purpose accelerometers, with a sensitivity of 100mV/g and a +5 per cent sensitivity tolerance, were certified as intrinsically safe in accordance with the requirements of the IECEx standards. The standard top-exit model is the 786A-IS.

The standard side-exit model is the 787A-IS, which is also available with a metric M8 mounting stud (model 787A-M8-IS). The 780A-IS is a compact sensor. The integral cable model is the 786F-IS. The 786T-IS is a dual-output model that senses both vibration and temperature. The six general-purpose accelerometers are suitable for the industrial machinery health monitoring of rotating equipment such as motors, pumps, fans, compressors, vibrating conveyors, chillers, gearboxes, reciprocating compressors, blowers, cooling towers, mixers, turbines and centrifuges.

These types of machinery are typically found in hazardous-area locations common to industries such as petrochemical, oil and gas, chemical processing, pharmaceuticals, food and beverage, pulp and paper, wastewater treatment, nuclear power and power generation. The IECEx standards are recognised by most industrialised countries, including Australia, Brazil, Canada, China, Croatia, the Czech Republic, Denmark, Finland, France, Germany, Hungary, India, Italy, Japan, Korea, Malaysia, the Netherlands, New Zealand, Norway, Poland, the Republic of Serbia, Romania, Russia, Singapore, Slovenia, South Africa, Sweden, Switzerland, Turkey, the UK and the US.

The International Electrotechnical Commission (IEC) publishes the IECEx scheme, a set of standards that specifies requirements for both hazardous-area electrical equipment and requirements for the quality system of manufacturers of hazardous-area electrical equipment.

Certification organisations perform the testing and qualifications required by the IECEx scheme. Wilcoxon sensors were tested to the IEC requirements by Kema and have been certified by Sira to meet the quality system requirements of the IECEx scheme. The company also offers other accelerometers and 4-20mA sensors certified to be intrinsically safe, explosion proof and approved for use in Class I Division 2 (Zone 2) environments.

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