P1D Clean ideal for hygiene-critical applications

Parker Hannifin has launched the P1D Clean, a clean-line pneumatic cylinder that features a multi-position, programmable stroke sensing system.

The cylinder incorporates an internal foil positioning sensor, which is said to eliminate problems of external dirt traps and makes the P1D ideal for use in applications where hygiene and ease-of-cleaning are essential.

The ability to provide programmable multi-position sensing of the cylinder rod position is said to give OEMs and end users the ability to improve the performance and productivity of machine systems without the need for costly accessories.

The P1D's sensing technology is based on a thin and robust multi-layer strip, set within the cylinder body extrusion and running along its length.

The strip comprises a flexible conductive magnetic foil positioned above and separate from a potentiometer formed from two longitudinal circuits.

A permanent magnet mounted around the circumference of the piston is then used to draw the conductive layer into contact with the potentiometer so that the exact position of the piston can be established.

The potentiometer circuit is fed directly to a logic and software PCB, again positioned internally, with a single M12 connector providing a link to external control devices that include an optional handheld programming unit or a conventional PLC.

This allows the P1D to be programmed remotely, eliminating the need for engineers to access or dismantle machine systems when setting up or reconfiguring production equipment.

Parker will initially be supplying the P1D with the facility to establish up to four position signals, which can be set anywhere along the stroke length and changed as required; there is, however, scope to increase the number of positions in the future.

These signals can be used to determine factors such as piston location, for enhanced control of machine sequences, plus deceleration or pre-start of other movements.

Parker can also supply cylinders preconfigured, to help design and production engineers reduce installation times still further.

The sensing technology is said to eliminate the need for external grooves that are normally used along a cylinder body to accommodate traditional sensors; this leaves a smoother design of body, free from traps for liquids, dirt or other debris.

Unlike external sensors, the positions of the new sensing system cannot be accidentally moved by physical impact or the use of cleaning equipment.

The P1D cylinder has a single connector, positioned in line with the air ports, to simplify installation, and has been tested and approved to IP67; where appropriate, it can also meet IP69K specification.

The P1D is constructed to ISO 15552 dimensional standards, enabling it to be exchanged for existing devices, and is available in bore sizes from 32-125mm with stroke lengths of up to 500mm.

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