POSIROT

®

/ POSITILT

®

Angle Sensors and Encoders The Functional Principle

PRAS/PRDS Series

(POSIROT

®

)

The angle sensors of the PRAS/PRDS series are based on a contact-free and absolute measure-ment principle. The position sensing element is a permanent magnet.Depending on the permanent magnet type, a to-lerance in the air gap and axial offset is allowable within certain limits. The detected magnetic field vectors are transformed by an internal circuit board into standard 4-20 mA, 0.5-10 V and SSI output signals.

PMIS Series

(POSIROT

®

)

The incremental encoder of the PMIS series con-sists of an XMR sensor head and a magnet ring as a magnetic scale. The circumference of the magnet ring contains a series of evenly spaced magnetic north and south poles.The angular position is determined contact-free and wear-free by the sampling of the sinusoid magnetic field above the surface of the magnet ring by the XMR-sensor head. The air gap between the sensor head and the magnetic ring can be up to 2 mm for a ring with a 5 mm period. The sensor head generates 90° shifted sine/cosine signals, through the integrated signal interpolation circuit, these signals are combined with the reference mark signal and transformed without a time delay into a square-wave output.

PTAS Series

(POSITILT

®

)

The PTAS series uses a pendulum with an inter-nal position magnet to provide the inclination an- gle. The cavity surrounding the pendulum is filled with a specific fluid that can be varied depending upon the amount of motion damping is required.The established PRAS2 or PRDS2 angle sensor is fitted into the PTAS2 housing. The stainless steel housing is thoroughly sealed and is rated up to IP69K, which makes it suitable for use in extreme environments found on cranes, off-highway con- struction equipment, ships and off-shore applica- tions. External magnetic fields due to power cables, magnetized materials or the earth’s magnetic field do not influence the accuracy of the inclinometer. The PTAS series is completely encapsulated in a magnetically shielded housing and is immune against magnetic fields as far as possible. ASM CAT-PR/PT-E-07 5 www.asm-sensor.com