PMI Rectilinear displacement transducer with magnetic drag - Patent pending

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50 to 1000 mm strokes
Cursor magnetic drag
Independent linearity up to ± 0.05%
Repeatibility: = 0.08 mm
Hysteresis: = 0.25 mm
Tracking error (see table)
Infinite resolution
No variation of electrical output signal outside theoretical electrical stroke
Working temperature: -30...+100°C
Electrical connection: 3-pole polyurethane screened cable with high flexibility (1m lenght)
AISI 316 stem and nipple
Lifetime: > 25x10⁶ meters or >100x10⁶ operations whichever is the smallest (within C.E.U.)
Max. working pressure 250 bar, 400 bar peak

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Solution

Mobile hydraulics

Gefran Solution for Mobile Hydraulics



Gefran offers solutions that perform specific functions in the field of Mobile Hydraulics. Gefran linear displacement transducers, displacement sensors, and indicators are ideal for a wide variety of applications: from steering systems through to stability control and to suspensions.

Flexibility
Gefran displacement transducers are based on potentiometric and magnetostrictive technology and provide various performance levels according to application requirements. All of the products:
    • Include a high protection level (IP67 - IP68)
    • Resist high pressures (350-700 bar for cylinder models)
    • Heavy-duty, ready to install in harsh environments or outdoors, and include high resistance to vibration and shock
    • Powered with low voltage 10...30 Vcc

Installation of a linear displacement transducer in hydraulic cylinders: Gefran offers 3 solutions

Outside the cylinder	Partially inside the cylinder	Completely inside the cylinder
External positioning (next to cylinder) • PC67 • PMA • RK XL0319	Installation internal the cylinder with sensor head outside • IK4 • RK • PMI • IC	Installation completely internal the cylinder • RK • RK-A • RK-C • PMI-SL

Applications
Earth-moving
Articulated wheel loaders include hydraulic systems for the movement of each joint. Many wheel loaders include visual or electronic on-off (inductive sensor) systems to adjust the loader arm. Using a displacement transducer with in-cab display provides more reliable and precise control.

Display
The use of simple displays or graphic terminals allows integration with more advanced control systems.

Checking pressure in hydraulic circuit
TK transmitters monitor oil pressure in the hydraulic circuit for checking vehicle load and stability.

Roll-over prevention
The synergy of displacement transducers inside (IC, RK) or outside (PC67, PMA) the cylinder with pressure transmitters (TK) guarantees total working control of the bucket to maintain tilt even during load handling. Load control guarantees greater stability and safety.

Steering system
RK displacement transducers are ideal for installation inside single-action cylinders normally used with hydrostatic steering units. The sensor is designed to guarantee resistance against vibration and shock typical in this application.

Stability control
Suspension cylinders are an integral part of a sophisticated, electronically controlled system that guarantees vehicle flexibility and stability based on applied weights, work load, and ground conditions. RK and IC transducers are designed to provide precise and positive control in this type of application.

Load handling control
The use of increasingly complex control systems to check vehicle position and movement of each joint requires the use of transducers with advanced interfaces, such as CANopen, available on all Gefran magnetostrictive transducers.

Lift	Agriculture

Gefran products for Mobile Hydraulics world

GF_VEDO / 2400 / 4T72
These instruments let you clearly and directly display values provided by installed sensors (for example, tool position), or perform complex calculations for active control of the vehicle.

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Displacement transducers
RK / RK-A / RK-C / IK4 / RK XL0319
     • Magnetostrictive technology                                        • Potentiometric technology
       Standard stroke: 50...4000 mm                                       Standard stroke: 50...1000 mm
       Protection up to IP68                                                       Protection up to IP67
       Resistance to vibrations up to 20g                                 Resistance to vibrations up to 20g
       Shock resistance up to 100g                                          Shock resistance up to 50g

Pressure transducers
The Gefran pressure sensor most appropriate for mobile hydraulic applications is the TK series with M12 (IP67) connector: pressure intervals usually range from 200 to 500 bar (3000 to 7500 psi).
     • Excellent accuract (0,25%)
     • High protection level (IP67)
     • Stability at high temperatures
     • Reliability

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