Incremental bearing-free rotary encoder – GEL 2478

1-/2-channel Hall effect rotational speed and position sensor with ATEX certification

Maintenance and wear-free rotational speed and position sensor using magnetic scanning
Scanning of measuring scale (for example, ferromagnetic target wheels or piston rods)
Reliable detection of high speeds to creeping (0 Hz to 20 kHz)
Robust and compact stainless steel housing for use in harsh and confined applications
ATEX certification for use in potentially explosive atmospheres

ATEX certification for use in potentially explosive atmospheres
Incremental measuring 1-/2-channel speed sensor based on the magnetic sensing principle
Contactless measurement of rotary or linear movements
Extremely robust stainless steel housing with a sensor tube diameter of 22 mm
Target wheel with module 1.0 to 3.5 or measuring rod with 4.0 mm pitch as measuring scale
High EMC immunity for interference-free signal transmission in challenging industrial environments
Highest product quality with optional certification according to DNV and many other standards

Product	Document	Languages
GEL 2478	Technical information	DE EN
GEL 2478	Product information*	DE/EN

Registration required

L1 Cable length H Sensor tube length (according to type key)

All dimensions in mm [inch]

1 channel

1 channel with inverse signals

2 channels, 90° phase offset

2 channels, 90° phase offset, with inverse channels

Electrical data
Supply voltage U_B (reverse polarity protected)	10 to 28 V DC with ATEX 10 to 30 V DC without ATEX
Current consumption I_B (without load)	≤ 45 mA
Output signal (short-circuit-proof)	Square-wave signals
Output signal level High	≥ U_B - 1.8 V
Output signal level Low	≤ 0.5 V
Output current per channel	≤ 10 mA
Frequency range	0 to 20 kHz
Duty cycle	50% ± 10%
Phase offset	typ. 90°
Slew rate (2 m cable)	≥ 10 V/μs
Electromagnetic compatibility	Rail vehicles (EN 50121-3-2) Industrial applications (EN 61000-6-1 to 6-4)
Dielectric strength	500 V AC (EN 61439-1)
Mechanical data
Module m target wheel	1.00 to 3.50
Permissible air gap (for Module m / Pitch p)	See air gap table
Target wheel width	≥ 10 mm (smaller upon request)
Target wheel tooth form	Involute gear teeth as per DIN 867, square gear teeth 1:1 or slotted disk (upon request)
Target wheel material	Ferromagnetic steel
Working and operating temperature	-40 °C to +85 °C with ATEX -40 °C to +120 °C without ATEX
Storage temperature	-40 °C to +120 °C
Degree of protection	IP 68
Vibration resistance	50 m/s²(EN 60068-2-6)
Shock resistance	100 m/s² (EN 60068-2-27)
Housing material sensor	Stainless steel (1.4305)
Weight sensor (2 m cable, without mating connector)	approx. 500 g
Resistance	< 5 bar (sensor tube completely closed up to the flange)

Electrical connection
Connection	PUR or silicone cable, screen connected to the housing on the encoder side
Maximum cable length	≤ 100 m
Cable LK10691
Cable material	PUR sheath, halogen-free and screened
Cable diameter	8.1 ± 0.3 mm
Cable cross section	6 × 1.0 mm²
Bending radius static/dynamic	24 mm / 41 mm
Cable LK10581
Cable material	Silicone sheath, halogen-free and screened
Cable diameter	9.2 ± 0.4 mm
Cable cross section	6 × 0.75 mm²
Bending radius static/dynamic	69 mm / 138 mm