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SENSORS & SENSING SYSTEMS FEATURE Pressure ports and the mechanical


interface are crucial to the pressure sensor for safe operation in high pressure hydraulics up to 45,000 PSI (3000 Bar). For pressure ranges up to 7500 PSI, 1/4" taper ports such as NPT or BSPT can be used. Above this pressure range, a metal-to-metal seal must be employed in high cyclic or dynamic operation. Straight threads such as 1/4” BSPP, G1/4, 7/16-20UNF and 9/16-218UNF


Typical strain values for pressure sensing technology


employ an O-ring seal-to-seal against the media. While these O-rings are good for static operations up to 1000 bar, under dynamic and high vibration conditions they must be de-rated to 400 Bar or the fitting will loosen and media will leak.


American Sensor Technologies www.astsensors.com Enter 219


. PROCESSING STRAW BALES


Designed for collecting, stacking and transporting straw bales, the Big Bale Transtacker operates continuously. This is towed by a tractor, with the operator controlling the entire machine from the cab. Its efficiency is largely due to both the ‘auto pick up’ and


the ‘auto tie’ functions that allow the machine to work seamlessly with minimal operator input. These functions work through a series of rotary sensors logging the position of the machines components and then relaying the data back to the ECU, whereby the next sequence of events is actuated. Facing reliability issues with the Hall effect sensors being


used, the company discovered the compact Novotechnik RFC4800 series angle sensors which are supplied by Variohm. The RFC4800 solution utilises a two part design with non-contact technology – comprising an encapsulated magnet position marker that is attached to the rotating shaft and a separate sensor which is encased in a robust IP69 rated, sealed housing. The sensor offers an effectively unlimited life for the mechanical parts and the 50,000 hour MTBF quoted figure for the electronics. It also provides a 12-bit resolution (0.09˚) analogue output which is absolute. With its wide choice of supply voltages, output formats


and electrical angle selection, the application flexibility available for the RFC4800 also allowed Big Bale Transtacker to exactly match requirements.


Variohm EuroSensor www.variohm.com Enter 220


The Push-fit People


INNOVATIVE PUSH-FIT SOLUTIONS FOR OEMS Made in the UK.


Over the last 50+ years, John Guest has worked closely with OEM design engineers to offer highly       solutions to their products, adding greater value by simpler Installation


www.johnguest.com info@johnguest.com


Enter 24


EST. 1961 AS BRITISH AS THE DAY IT WAS BORN


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