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Magnetic Absolute Encoder Gel 2352

GEL 2352 with clamping flange , SSI
GEL 2352 with semi hollow shaft, CANopen interface


  • Absolute rotary encoder with a maximum total resolution
    of 28 bits in a compact design
  • Encoder series includes single turn variants with up to
    16-bit resolution and multiturn variants with up to 12-bit
  • Magneto-resistive scanning of a ferromagnetic steel disc
    provides unambiguous position values at every angular
    position via digital interfaces
  • Evaluation based on Vernier principle
  • Optionally with stainless steel housing


  • 28-bit total resolution
  • Mechanical gear
  • High accuracy ± 0.08°
  • Interfaces:
    - SSI
    - CANopen
  • Operating temperature -40 °C to +105 °C
  • Protection class up to IP 67


  • Suitable for all standard applications and also for real
    heavy-duty applications
  • Full function in case of condensation: dew-point resistant!
  • Extremely resilient housing made of anodised aluminium,
    stainless steel variant available
  • Not affected by dirt or oil mist
  • Withstands very high shock and vibration loads as well as
    acceleration forces

Field of application

  • General mechanical engineering
  • Regenerative energies
  • Mobile machines


Construction and design

The resilient encoder housing with a standard flange size of
58 mm is made of anodised aluminium and can be supplied
alternatively in stainless steel.
The double-bearing encoder shaft forms a robust mechani-
cal unit with the metal code disc. The multiturn variant op-
erates with a mechanical gear.
A uniform temperature coefficient on all rotating components
ensures the temperature behaviour of the absolute rotary
encoder is stable over the long-term.

Sensing principle

The GEL 2352 is based on contactless magnetic scanning
of a ferromagnetic steel code disc, the so-called contour
disc. Magnetoresistive (MR) sensors scan three tracks, de-
livering corresponding sinusoidal signals. The phase posi-
tion of the three sinusoidal signals is unambiguous within a
single turn. The phase position is evaluated on the Vernier
principle, providing the absolute position with high resolution
and accuracy.


The absolute rotary encoder supplies the position values ei-
ther in binary or gray code via a fast synchronous serial in-
terface (SSI) or as per encoder profile DS406 via a CANopen

Temperature ranges

High precision SMD components are used in the absolute
rotary encoder. Despite careful selection, thermal ageing of
these components cannot be excluded. For this reason the
encoder should be stored at a temperature from -40 °C to
+85 °C.
Operating temperatures of -40 °C to +105 °C are allowed,
an installed absolute rotary encoder is not allowed to exceed
this temperature range. The function of the absolute rotary
encoder is ensured within the operating temperature range
allowed, (DIN 32878); here it is the temperature at the en-
coder housing that applies.
The temperature of the absolute rotary encoder is affected
by the installation situation (thermal conductance, thermal
radiation), the heating caused by the absolute rotary encod-
er (bearing friction, electrical power loss) and the ambient
temperature. The operating temperature may be higher than
the ambient temperature depending on the operation of the
absolute rotary encoder.
Depending on the supply voltage the heating caused by the
encoder can be up to 10 °C. At high operating speeds
> 5,000 min-1 the heating caused by the encoder can be up
to 20 °C due to the bearing friction.
If the absolute rotary encoder is operated close to the limits
of the specifications allowed, the ambient temperature must
be reduced by suitable means (cooling) such that the oper-
ating temperature range allowed is not exceeded.

Technical Data

Accuracy &± 0.08°
Repeatability < 0.01°
Electrical data
Operating voltage 10 to 30 V DC with reverse voltage protection
Power consumption < 1 W
Resolution single turn 8, 9, 10, to 16 bit (measuring steps over 360°)
Resolution multiturn 12 bit (revolutions, mechanical gear)
Interface SSI (gray / binary), CANopen encoder profile DS406
Mechanical data
Moment of inertia of rotor 611.8 x 10-6 kgm2
Material Aluminium anodised
stainless steel 1.4101
Weight singleturn Aluminium: 250 g, stainless steel: 480 g
Weight multiturn Aluminium: 290 g, stainless steel: 555 g
Operating speed (limit value) 6,000 min-1
Operating torque < 3 Ncm
Bearing life 105 h at 1,000 min-1
Shaft sealing ring (option) Material: Viton, protection class IP 67 / 69K
Ambient data
Working temperature range -40 °C to +85 °C
Operating temperature range -40 °C to +105 °C
Storage temperature range -40 °C to +85 °C
Protection class IP 64, IP 67
Vibration protection (DIN EN 60068-2-6) 200 m/s2, 10 to 2000 Hz
Shock protection (DIN EN 60068-2-27) 2000 m/s2, 11 ms
EMC EN 61000-6-1 to 4
Insulation strength Ri > 1 MΏ, at a testing voltage of 500 V AC
Relative humidity of air max. 99 %
Condensation permissible
Clamping flange
Shaft load (radial/axial) 90 N / 70 N at 1000 min-1
Synchro flange
Shaft load (radial/axial) 90 N / 70 N at 1000 min-1
Semi hollow shaft
Shaft load (radial/axial) 75 N / 70 N at 1000 min-1

Dimensional drawings

Dimensional drawings GEL 2352 - SSI (single turn)

Dimensional drawings

Dimensional drawings GEL 2352 - CANopen

Synchronous serial interface

The synchronous serial interface transfers the position data
at a clock frequency of up to 2 MHz. Prior to further position
sampling, a minimum clock pulse space of 16 μs must be

Principle of the serial data transmission [gray code (25 bits),

RS 422 / RS 485 standard]
f 62.5 kHz
T Length of the clock signal period (= 1/clock frequency)
Tp Clock pulse space, between the clock sequences TP At least 16 μs

Cable length

With the synchronous serial interface protocol the transmis-
sion rate allowed drops with increasing cable length. A
screened, twisted pair cable is recommended for the signal
cables (± CLOCK and ± DATA).

Direction of rotation

The encoder can output increasing position values on the
clockwise or counter clockwise rotation of the shaft. The di-
rection of rotation can be selected by using the CW/CCW
input (counting direction).

PRESET function

The output signals can be set to a PRESET value from any
position. As supplied the encoder is set to half the maximum
resolution. The PRESET is set electronically if the supply
voltage VS is briefly t > 100 ms applied to the PRESET input
(do NOT apply continuously). Other PRESET values are
available on request.

pin signal Description
1 GND Earth
2 Preset Electronic adjustment
VS, t > 100 ms
3 DATA- Output: Differential data signal in accordance with
RS 485
5 CLOCK- Input: Differential clock signal in accordance withRS 485
7 VS Opreating voltage
8 CW/CCW Direction of rotation: Default = GND; Inverse =VS
M12 connector, 8-pin
Output code bionar7y Gray
Driver RS 486 compatible
Clock frequency max. 2 MHz
Transmission Max. 1,200 m depending on transmission rate
The immunity to interference high immunity to interference via symmetrical transmission
Direction of rotation adjustable, standard clockwise (CW) with view on the en-
coder shaft, increasing position values
The immunity to interference high immunity to interference via symmetrical transmission
The immunity to interference high immunity to interference via symmetrical transmission

CANopen interface

Pin layout - CANopen
pin Bus IN Bus OUT
M12 connector A-coded
Technical data CANopen
Device profile CANopen DS406 with additional function
Cable diameter 8 m
Programmable parameters Resolution, PRESET, offset, counting direction, speed, ac-
celeration and rotational speed output, range output referred
to pre-defined values, scalable number of steps (decimal/
Output code Binary
Baud rate 50 kbit/s...1 Mbit/s can be set via bus master
Sensor ID 0...99, can be set via bus master
Terminating resistor To be provided externally
Operating temperature -40...+85 °C (shorttime 100 °C)

Type code GEL 2352

Customer-specific designs

Customer-specific modifications to mechanical and electrical features are in principle possible.

Restriction of the type code for SSI
Feature Possible variant
Number of revolutions 00, single turn
Flange, shaft B, D
Electrical interface 1
Restriction of the type code for CANopen interface
Feature Possible variant
Flange, shaft E
Electrical interface 2
Material 2



Ordering overview for mounting accessories
Description Item number
Torque support, hard(1) FB 23504
Torque support, soft(1) FB 23505
Bushing, 8 mm, POM (polyoxymethylene) RH 23501
Bushing, 10 mm, POM (polyoxymethylene) RH 23502
Bushing, 12 mm, POM (polyoxymethylene) RH 23503
Bushing, 8 mm, brass RH 23504
Bushing, 10 mm, brass RH 23505
Bushing, 12 mm, brass RH 23506
Clamping elements (3 pieces) KL 200
Metal coupling, inside diameter: 5 to 12 mm (state shaft diameter) MK 8
Metal coupling, inside diameter: 6 to 15 mm (state shaft diameter) MK 12
Clamp coupling KK14, inside diameter: 6 to 16 mm (state shaft diameter) KK 14
Ordering overview for connection accessories
Description Item number
Connection cable 10 m, 8-pin M12 socket, straight / flying lead FS 1352
8-pin M12 mating connector SSI, straight FS 1095
M12 mating connector CANopen, 5-pin socket, A-coded FS 3020
M12 mating connector CANopen, 5-pin plug, A-coded FS 3021
CANopen connection cable 10 m, 5-pin plug / flying lead with ferrules BK 2100
CANopen connection cable 2 m, 5-pin plug / flying lead with ferrules BK 2101
CANopen connection cable 10 m, 5-pin socket / flying lead with ferrules BK 2102
CANopen connection cable 2 m, 5-pin plug / flying lead with ferrules BK 2103
CANopen connecting cable 10 m, 5-pin socket/plug BK 2104
CANopen connecting cable 10 m, 5-pin socket/plug BK 2103
CANopen terminating resistor M12 FS 3040