Gefran RK-4 Data Sheet
RK-4
CONTACTLESS MAGNETOSTRICTIVE LINEAR POSITION TRANSDUCER
WITH THREADED HEAD (ANALOG OUTPUT)
Main characteristics
• Absolute transducer
• Strokes from 50 to 4000mm (RK-4-_ _ _ _ -N/E/R)
• Direct analog output (RK-4-_ _ _ _ -N/K/E)
• Reverse analog output (RK-4-_ _ _ _ -R)
• Operating temperature: -30...+90°C
• Resistance to vibration (DIN IEC68T2/6 20g)
• Power supply 18Vdc...30Vdc
• Optional 12Vdc power supply (RK-4-_ _ _ _ -K)
Contactless linear position transducer with magnetostrictive technology: the absence of electrical contact on the cursor
eliminates problems of wear and consumption and guarantees almost unlimited life.
The reduced dead zones and the head’s threaded shape and small size make the RK-4 series ideal for applications
requiring the installation of the transducer partially inside the hydraulic cylinder as a simplified alternative compared to
the models of the IK4 series.
The overall dimensions of the sensor are among the smallest available on the market.
For what concerns the output signal, the analog interface gives the displacement of a single cursor (available in the several ranges in Voltage or Current).
Excellent linearity, repeatability, resistance to mechanical vibrations and shocks complete the product’s specifications
overview.
TECHNICAL DATA
Model
Measurement taken
Position read sampling time
(typical)
Shock test DIN IEC68T2-27
Vibrations DIN IEC68T2-6
Displacement speed
Max. acceleration
Resolution
Working pressure
ENVIRONMENTAL DATA
Protection
Operating temperature
Storage temperature
Coefficient temperature
-30°…+90°C for strokes ≤ 2500 mm
from 50 to 4000 mm
(max. 1200 mm RK-4-_ _ _ _-K)
Displacement
1 ms
100g, 11ms single shock
20g, 10...2000Hz
≤10 m/s
≤ 100 m/s
Infinite, limited by noise
350 bar (peak max 500 bar)
and power supply ≤ 24 Vdc
otherwise -30...+70°C
2
displacement
(10µm)
IP 67
-40°…+100°C
0.005% FS / °C
ELECTRICAL DATA
Nominal power supply
Max. power ripple
Output signal
Max. analog output load
Output current
consumption
Electric isolation
Protection against
polarity inversion
Protection against
overvoltage
18...30Vdc
opt. 12Vdc (RK-4-_ _ _ _-K)
1Vpp
0,1...10,1Vdc (RK-4-_ _ _ _ -N)
0,1...5,1Vdc (RK-4-_ _ _ _ -K)
4...20mA (RK-4-_ _ _ _ -E)
20...4mA (RK-4-_ _ _ _ -R)
5KΩ
max 40 mA
(load on start/stop output: 300 Ω)
100 Vdc
Yes
Yes
MECHANICAL DIMENSIONS
L (total length)
M4 thread
CE (electrical stroke) = Model
6 mm depth
MOUNTING INSIDE A CYLINDER
No active zone
Magnet
M version M18 x 1.5
I version 3/4”-16UNF-2A
No active
zone
Installation area
No active
zone
non-magnetic spacer
floating magnet
THREAD M18x1,5
The seal surface must be free from winding or
1
longitudinal scratches
Ro 1.6µm for seals with NON pulsating pressure
Ro 0.8µm for seals with pulsating pressure
Suggested O-Ring:
PARKER 6-349 15.4x2.1
Material: Viton 90° Shore-A
Mixes: PARKER N552-90
THREAD 3/4”-16UNF
1
The seal surface must be free from winding or
longitudinal scratches
Ro 1.6µm for seals with NON pulsating pressure
Ro 0.8µm for seals with pulsating pressure
Suggested O-Ring:
PARKER 3-908 16.36x2.21
Material: Viton 90° Shore-A
Mixes: PARKER N552-90
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