High-current hermetically sealed proximity sensors
June 2001
Sensors & Transducers
By applying the economic advantages offered by the National Electrical Code and by utilisation of hermetically sealed high-current Magnum sensors, the AccuTrak 9000 merges technology with economy. Cost saving benefits are realised by the consolidation of components and the complete elimination of hazardous location seal fittings, wiring, conduit and their associated labour costs.
The Magnum proximity sensor was designed in response to customers' needs. The main requirement for any product in a process plant is reliability. The Magnum sensor is warranted to perform as specified for a full five years.
Corrosion resistance
The highly corrosion-resistant tungsten contacts are hermetically sealed in an inert atmosphere to protect them from dust, oxidation or external corrosion. The entire sealed unit is then encapsulated in a plastic coating to cushion the sensor in case of shock or vibration. After encapsulation, the sensor is encased in a flame-retardant high-impact thermoplastic enclosure and then re-encapsulated in a premium grade polymer impervious to moisture, chemicals and solvents.
The Magnum sensor was developed specifically for valve monitoring applications. The Form C, SPDT contacts are manufactured from solid pieces of pure tungsten. Since tungsten has the highest melting point of all metals plus excellent electrical conductivity characteristics, the proximity sensor is capable of handling 3 A (switching) at 120 V a.c. and 2 A (switching) at 24 V d.c. The sensor is UL listed and CSA recognised.
Field reliability
The industrial environment requires products that function reliably and safely. By evaluating customers' needs, conducting field tests to confirm that evaluation and then working with design engineers to provide innovative and cost-effective solutions to those needs, the Magnum proximity sensor was conceived. Technology was borrowed from pacemakers, sensors that monitor the flaps on jumbo jets and the high-current switching capability required for large halogen underwater flashlights.
Valve & Automation
(011) 397 2833
(031) 579 2593
(035) 751 1458
[email protected]
www.valve.co.za
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