Sealed transducers measure under pressure
A
Gefran SIEI UK product story
Edited by the Engineeringtalk editorial team
Aug 22, 2002
Gefran has a new series of absolute linear displacement transducers for use under extremely severe environmental conditions.
Gefran has a new series of absolute linear displacement transducers for use under extremely severe environmental conditions.
These new displacement transducers, called PME, PMI and PMA are the result of constant analysis of market demands and of Gefran's 20 years of experience in potentiometer technology.
As opposed to traditional displacement transducers with IP65 protection level, this new series, designed typically for oil-pressure cylinders, is completely sealed and guarantees an IP67 or IP68 protection level.
The new PME/PMI series exploits magnetic coupling between a cursor outside and a cursor inside the transducer, creating a single system called "magnetic tooth" that resists more than 20G of acceleration.
Elimination of the actuator rod, plus a temperature range of -40 to +100C and lack of signal conditioning electronics, mean that these products can be used under severe conditions in which other technologies, based on a greater price/performance ratio, are excluded.
PME transducers are built of anodised aluminium, have a 12.7 mm diameter, and guarantee resistance to pressures of 20bar with maximum cursor shift speed of 5m/s.
The second family, called PMI, has a structure built entirely of 316L stainless steel.
Designed for position feedback of oil-pressure cylinders with housing inside the piston, it resists up to 250bar and maintains the classic features of an absolute potentiometer.
The PMI transducer has been engineered to allow replacement of the internal cartridge without having to disassemble the hydraulic cylinder, thereby achieving significant savings in maintenance.
Standard electrical strokes range from 50 to 1000mm in 50mm increments, with a life of 100 million strokes or 25,000km and a nonlinearity error of 0.05%, the standard value for potentiometric transducers built by Gefran.
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Contact Gefran SIEI UK
Tel (UK) 08452 604555
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