PRAS3 datasheet(5/52 Pages) ASM-SENSOR

5 / 52 page

ASM

CAT-PR/PT-E-07

www.asm-sensor.com

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 4-0 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 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 PRAS or PRDS angle sensor is

fitted into the PTAS 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.

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