Accelerometers receive hazardous area approvals
A
Wilcoxon Research product story
Edited by the Engineeringtalk editorial team
Jul 14, 2008
The 786A-IS, 786F-IS, 786T-IS, 787A-IS and 787A-M8-IS are all certified with KEMA, a European hazardous area certifying agency.
Wilcoxon Research has improved the hazardous area certifications on several of its accelerometers.
The products are now compliant with the new European ATEX standards.
The 786A-IS, 786F-IS, 786T-IS, 787A-IS and 787A-M8-IS are all certified with KEMA, a European hazardous area certifying agency.
In Europe, the new ATEX approvals are for Class I Zone 0 Ex ia IIC T4.
In the US, these same sensors are hazardous area certified for Class I, Div 1 GP A B C D; Class II, Div I GP E F G; and Class III Div 1.
The 766-35, 793-35, 793-10-35, 797-35 and 797L-35 models are now approved by SIRA, another European hazardous area products certifying agency.
These sensors received hazardous area certification for Class I Zone 0 Ex ia IIC T4 rated locations.
The 793V-35, also certified with SIRA, is rated for use in Class I Zone 0 Ex ia IIA T4 locations.
The sensors were evaluated to the latest revision of the ATEX standards, due to become mandatory soon.
The latest ATEX standards EN 60079-0:2006, EN 60079-11:2007 and EN 60079-26:2004 are replacing standards EN 50014, EN 50020:2002 and EN 50284:1999.
The safety parameters associated with these sensors have increased from 47 to 93mA and from 400 to 650mW.
These changes permit the sensors to be used with a wider range of safety barriers.
This increase may allow a customer to use the same safety barriers that they use for other intrinsically safe installations and not have to manage two or more types of safety barriers.
Wilcoxon Research offers several safety barriers for use with its intrinsically safe certified sensors, includingISBS-STD-01.
The 786 series, 787 series, 793 series and 797 series of vibration sensors are primarily 100mV/g general purpose accelerometers and include 500mV/g low-frequency sensors.
The 793V series is a 100mV/ips general purpose velocity sensor.
Applications for these vibration sensors include machinery health monitoring of motors, fans, pumps, gearboxes, blowers, machine tool spindles, compressors, chillers, rollers and mixers.
Predictive maintenance and condition-based monitoring using vibration sensors is common in industries such as pulp and paper, nuclear power, power generation, petrochemical, oil and gas, food and beverage, pharmaceuticals, railway, steel making and wastewater treatment plants.
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