POSITION TRANSDUCERS

More than fifty years of experience, an organisation with a strong focus on the customer’s needs and constant technological innovation have made Gefran a benchmark in the design and production of sensors, systems and components for industrial process automation and control. Expertise, flexibility and process quality are the factors that distinguish Gefran in the production of integrated tools and systems for specific applications in various fields of industry, with consolidated know-how in the plastics, mobile hydraulics, heating and lift sectors. Technology, innovation and versatility represent...

POSITION TRANSDUCERS Linear and angular position transducers detect the position of mechanical parts in motion. Real-time position detection makes it possible to reduce machine cycle times and to intercept points for actuation of other servomechanisms in the stroke. For example by introducing acceleration and deceleration ramps, Gefran has adopted a number of technologies for transduction of position measurement: - POTENTIOMETRIC of military origin, in which the resistive and collector track are electrically connected by means of contact brushes mounted on the spool. - MAGNETOSTRICTIVE HYPERWAVE...

POSITION TRANSDUCERS APPLICATION SECTORS PLASTIC AND RUBBER INJECTION PRESSES MATERIALS HANDLING HYDRAULIC AND PNEUMATIC CYLINDERS RENEWABLE ENERGIES AUTOMOTIVE TESTING MACHINES MEDICAL SECTOR LEVEL CONTROL FARMING AND EARTHMOVING MACHINERY EQUIPMENT TEST BENCHES MARBLE PROCESSING MACHINES WOODWORKING MACHINES

MAIN FEATURES • Absolute position measurement: when the system is switched on, the transducer immediately provides the actual position, with no need for mechanical repositioning. • Lifespan: from 100 million maneuvers of potentiometric transducers to the practically unlimited lifespan of HYPERWAVE MAGNETOSTRICTIVE transducers or HALL EFFECT transducers, thanks to the absence of contact between the transducer and its position reader. • High resolution of the output signal: from virtually infinite for potentiometers to 0.5 pm for magnetostrictive transducers. • Easy installation and simple connection...

• SSI with 16, 21, 24, 25 bit binary or gray code output data format • Sampling time 250 msec • 10-Link with digital output format 32 bit position, 16 bit speed, 2 bit SSC • Sampling time 1 msec • Speed data resolution 0.5 mm/sec • Setting of 2 cams or shut-off thresholds (Single/Two/Window) • DPV0 Profibus interface on RS485 according to IEC 61158T • Position resolution settable via software up to 1 pm • Speed resolution up to 0.25 mm/sec • Position and speed measurement with up to 4 indipendent cursors • Setting of 4/8 cams or shut-off thresholds • Profinet RT (real time) & IRT (Isochronous...

MAGNETOSTRICTIVE TECHNOLOGY The evolution of the rectilinear potentiometric transducer is represented by magnetostrictive position transmitters in which there is no contact between the transducer and its cursor. The measuring element consists of a special alloy tube flanked by a copper conductor. The measurement process takes place through the interaction of mechanical waves and electromagnetic fields. Tipically, every millisecond, a 3 Ampere pulse of current of 3 microseconds is sent along the tube, thanks to the sensor’s electronics; the interaction between the current pulse and the magnetic...

POSITION TRANSDUCERS POTENTIOMETRIC TECHNOLOGY The key element in potentiometric transducer consists of two linear tracks, both of which are the same length as the maximum displacement to be measured and made of a conductive material. A movable cursor with two connected sliding contacts (brushes) acts as a bridge between the two tracks, and measures the potential difference between the first, resistive track and the second, conductive track. SLIDER OR “WIPER” (mounted on moving part) SLIDER ARM SHORT CIRCUIT DISPLACEMENT POTENTIOMETER FORCE SUMMING MEMBER The cursor may be external to the device,...

TRANSDUCER SELECTION GUIDE LENGTH OR ANGLE TO BE MEASURED Gefran transducers can be used to detect linear displacements on strokes from a minimum of 10 mm to a maximum of 8300 mm, or angular measurements ranging from +10° to +-180°. It should always be kept in mind that two strokes are normally specified: • mechanical stroke: This is the effective translation that the transducer cursor can make; • useful electrical stroke: this is the part of the mechanical stroke in which the linearity of the transducer is guaranteed. This means that when studying the application, it is necessary to choose a...

POSITION TRANSDUCERS GEFRAN TRANSDUCERS AND INSTRUMENTS: THE WINNING COMBINATION Gefran instrumentation and position transducers are the best solution for detecting the position of moving mechanical parts. Gefran instruments are designed with user-configurable digital inputs in mV/V, voltage and current. ANCHORAGE SYSTEM The transducer can be mounted using three types of support: • brackets: this is the most traditional method; it requires a free surface on which to install the transducer and involves use of two or more brackets, depending on the length of the sensor; • flanges: ideal in applications...

MAGNETOSTRICTIVE POSITION TRANSDUCERS MAIN TECHNICAL CHARACTERISTICS USEFUL ELECTRICAL STROKE INDEPENDENT LINEARITY infinite (limited only by output noise) SAMPLING TIME PROPERTIES OF MEASUREMENT PRINCIPLE Magnetostrictive ultrasonic time measurement (system without physical contact) Magnetostrictive ultrasonic time measurement (system without physical contact) Magnetostrictive ultrasonic time measurement (system without physical contact) Magnetostrictive ultrasonic time measurement (system without physical contact) OPERATING TEMPERATURE STORAGE TEMPERATURE POSITION READER SHIFT SPEED SLIDING...

CURSORS - POSITION READERS WPG SERIES ANCHORAGE BRACKETS

POSITION TRANSDUCERS MAGNETOSTRICTIVE TRANSDUCER CONNECTORS WITH ALUMINIUM PROFILE WPG-A WPP-A WPP-S WPA-A WPL-A WPA-S MK4-P WPA-F WPA-E CON069