Incremental bearing-free rotary encoder – GEL 248

Compact 2-channel Hall effect speed sensorwit HTL- or TTL-output signals

Maintenance and wear-free speed sensor using magnetic scanning
Scanning of ferromagnetic measuring scales (for example, target wheels, toothed racks, slotted disks and sprockets)
Reliable detection of high rotational speeds to creeping (0 Hz to 25 kHz)
Most reliable direction of rotation detection by evaluating two channels
Extremely compact rotary encoder for easy integration into all industrial applications

Incremental, differential measuring 1-/ 2-channel speed sensor based on the magnetic principle
Highest signal quality for reliable evaluation in control systems
Robust and compact zinc die casting housing
Suitable for various measuring scales such as target wheels, toothed racks, slotted disks and sprockets
Measuring scales with modules 1.00 to 4.00 possible
Highest signal quality for reliable evaluation in control systems

Product	Document	Languages
GEL 248	Technical information	DE EN CN
GEL 248	Operating instructions*	DE/EN

Registration required

(Cable outlet radial with screw sleeve)

(Cable outlet at side with screw sleeve)

All dimensions in mm [inch]

2 channels, 90° phase offset; 10 ... 30 V DC

2 channels, 90° phase offset, with inverse channels; 10 ... 30 V DC

2 channels, 90° phase offset, with inverse channels; 5 V ± 10 %

Signal pattern	V	X	T
Electrical data
Supply voltage U_B(reverse polarity protected)	10 to 30 V DC		5V ± 10 %
Current consumption I_B(without load)	≤ 50 mA
Output signal (short-circuit-proof)	Square-wave signals
Output level	HTL		TTL
Output signal level High	≥ U_B - 2 V		≥ 3.5 V
Output signal level Low	≤ 1.5 V		≤ 0.8 V
Output current per channel	≤ 20 mA
Frequency range	0 to 20 kHz
Duty cycle	50% ± 20%
Phase offset	typ. 90°
Mechanical data
Housing material sensor	Zinc
Sensor weight (incl. 2 m cable)	approx. 150 g
Cable data
Cable	halogen-free and screened
Cable diameter	5.5 ± 0.2 mm	5 - 0.3 mm	5 - 0.3 mm
Cable cross section	4 × 0.5 mm²	9 × 0.15 mm²	9 × 0.15 mm²
Minimum bending radius static/dynamic	11 mm/28 mm	10 mm/25 mm	10 mm/25 mm
Environmental tests
Working and operating temperature	-40 °C to +120 °C
Storage temperature	-40 °C to +120 °C
Insulation resistance	500 V DC, > 1 MΩ
Voltage sustaining capability	500 V AC, 1 minute
Electromagnetic compatibility Electromagnetic emission Electromagnetic immunity	DIN EN 61000-6-4; DIN EN 61000-6-3 DIN EN 61000-6-2; DIN EN 61000-6-1
Degree of protection on measuring side	IP 68
Vibration resistance	200 m/s2 (EN 60068-2-6)
Shock resistance	200 m/s2 (EN 60068-2-6)
MTTF value	2,000,000 h at 55 °C
Requirements for the target wheel
Target wheel material	Ferromagnetic steel
Target wheel tooth form	Involute gear teeth according to DIN 867
Target wheel width	≥ 10 mm
Permissible eccentricity	≤ 0.3 mm
Module m target wheel	1.00 to 4.00 (more on request)