Incremental bearing-free rotary encoder – GEL 247

1-/2-channel Hall effect speed sensor with voltage or current output and
standstill voltage

Maintenance and wear-free speed sensor using magnetic scanning
Scanning of measuring scales (for example, target wheels made of ferromagnetic materials)
Reliable detection of high rotational speeds to creeping (0 Hz to 25 kHz)
Most reliable direction of rotation detection and standstill detection during startup torque.
Robust and compact stainless steel housing for use in harsh and confined applications

Inquiry & Support

Technical information

Properties

Incremental, differential measuring 1-/ 2-channel speed sensor based on the Hall principle
Highest signal quality for reliable evaluation in control systems
Maximum compatibility due to voltage or current output and standstill voltage
High EMC immunity for interference-free signal transmission in challenging industrial environments
Configuration flexibility thanks to freely selectable cable outlet, cable protection, and connector variants
In accordance with a range of standards and requirements for a variety of applications:
Technical data - Environmental test

Advantages

Optimized lifecycle cost
Maintenance and wear-free
Various configuration options
Compact and robust design
Easy to assemble
Simple integration
Cable break monitoring
Electrically isolated measuring systems
Suitable for safety applications
High signal quality

Downloads

Product	Document	Languages
GEL 247	Technical information	DE EN CN
GEL 247	Product information*	DE/EN

Registration required

Fields of application

Industry and automation

Printing and packaging machines:

Synchronization of conveyor belts
Register control during printing

Automotive and commercial vehicles

Vehicle drives:

Speed measurement on crankshafts and camshafts for engine control units
Determination of rotor position in electric motors (BLDC, PMSM)
Input/output speed in gears for gear change strategy

Vehicle movement dynamics systems:

Wheel speed sensors for ABS/ESP
Torque distribution in all-wheel drive systems

Commercial vehicles and agricultural machinery:

Speed monitoring on PTO shafts, hydraulic pumps
Harvesting machinery: Worm conveyors, threshing drums

Railroad technology and transportation

Rail vehicles:

Wheel speed sensors for traction control and brake control
Drive control for electric locomotives and railcars

Conveyor belts and cable cars:

Speed monitoring on deflection pulleys
Drive synchronization in multi-motor systems

Maritime applications

Drive:

Speed measurement on marine engines, turbochargers, gearboxes, and generators

Auxiliary units:

Input/output speed detection for slip control

Energy and utilities

Wind turbines:

Rotor speed for power control
Pitch adjustment (rotor blade angle control)

Hydropower plants/turbines:

Speed control for synchronization with mains frequency

Generators and emergency power systems:

Speed detection for frequency monitoring and load management

Building technology and infrastructure

Elevators and escalators:

Speed and position of the car
Safety systems (emergency stop in case of overspeed)

Building machinery:

Pump and fan speeds in large HVAC systems

Logistics and conveyor technology

Conveyor belts:

Speed control in distribution centers

Automatic storage systems:

Positioning of rack feeders

Crane systems:

Lift and undercarriage control

Dimensional drawings

Cable outlet straight

Cable length L is determined by type code

Cable outlet at side

Cable length L is determined by type code

All dimensions in mm [inch]

Technical data

Voltage output

Display of signal patterns

Signal pattern E-

1 channel

Signal pattern F-

1 channel with inverse signals

Signal pattern S-

1 channel with directional signal

Signal pattern V-

2 channels, 90° phase offset

Signal pattern X-

2 channels, 90° phase offset, with inverse channels

Signal pattern D-

2 channels, electrically isolated, 90° phase offset

Signal pattern H-

2 channels, electrically isolated, 90° phase offset, with inverse channels

Signal pattern EM

1 channel with standstill voltage

Signal pattern DM

2 channels, electrically isolated, 90° phase offset, with standstill voltage

Signal pattern EI

1 channel; current output

Signal pattern VI

2 channels, 90° phase offset; current output

Signal pattern DI

2 channels, electrically isolated, 90° phase offset; current output

Signal pattern	E-	S-	V-
Electrical data
Supply voltage U_B(reverse polarity protected)	10 to 30 V DC
Current consumption I_B (without load)	≤ 15 mA	≤ 25 mA
Output signal (short-circuit-proof)	Square-wave signals
Output signal level High	≥ U_B- 1.0 V
Output signal level Low	≤ 1.0 V
Output current per channel	≤ 20 mA
Frequency range	0 kHz to 25 kHz
Duty cycle	50% ± 20%
Phase offset	–		typ. 90°
Mechanical data
Sensor tube material	Stainless steel
Flange material	Stainless steel
Sensor weight (incl. 2 m cable)	500 g
Cable
Connection	Cable outlet straight or at side, connector in accordance with specification
Cable length	≤ 100 m
Screening note	Cable screen is connected directly or, as an option, capacitively in the sensor
Environmental tests
The speed sensor complies with a range of standards and requirements for a variety of applications: Technical data - Environmental test
Requirements for the target wheel
Material	Ferromagnetic steel
Tooth form	Involute gear teeth as per DIN 867 (others upon request)
Width	≥ 10 mm (smaller upon request)
Module m	1.00/1.25/1.50/1.75/2.00/2.25/2.50/2.75/3.00/3.25/3.50

Voltage output with standstill voltage