Linear Scale Gel 177

Linear Scale Gel 177
Linear Scale Gel 177

General Information

The rugged linear scale GEL 177 - made of aluminium extruded profile - was conceived for the machine construction industry. The position sensing is performed contactless by means of permanent magnets of various designs.

  • An open magnet is directly mounted to the moving machine part. It runs contactless over the profile housing.
  • A position slide with magnets runs on profiled rails in the housing. It is connected to the moving machine part with a ball-shaped coupling.

This linear scale offers the user the following important advantages:

  • a long service life due to the non-contacting and wearless measuring of position magnets
  • direct, digital synchronous serial ouputs (SSI) or analogue current or voltage ouput
  • there is a homogeneous supply voltage of 24 V
  • for lengths up to 5,000 mm
  • resolution up to 5 m (SSI)

Output Signals

The absolute information on the travelled path is supplied either digitally or analogue. The digital transmission is performed in Gray-Code, so that a simple cabling is ensured and the transmission security rises. Various current/voltage outputs are available as analogue output signals.

Measuring principles

The tried and tested measuring principle was further improved. It is the running time of the torsion pulse that is measured and which is proportional to the distance between an internal start signal and a stop signal. The torsion emerges from the interaction of two magnetic fields under the position magnet. The running time is the absolute measure up to the position of the magnet and is transformed into a digital or analogue output signal.

Technical Data

Sensor Analogue SSI
sensor head aluminium die casting
scale aluminium extruded profile
protection class IP 65
fastening with movable mounting feet
connection type plug or cable connection
measuring length 50 ... 5,000 mm in 50 mm steps (special lengths in 5 mm steps)
resolution 25 m or 16 Bit 5 m
linear tolerance (non-corrected) < 0.02 %*, min. 50 m (independent of influences of temperature from outside) < 0.01 %*, min. 40 m (independent of influences of temperature from outside)
repeatability < 0,001 %*, min. 2,5 m
hysteresis < 4 m
voltage supply 24 V DC (+20 % /-15%)
power consumption 100 mA typ. 70 mA typ.
temperature coefficient < 40 ppm/C < 15 ppm/C
voltage sustaining capability 500 V
operating temperature -40 C ... +75 C
EMC (if the assembly instructions are observed)
electromagnetic emissions EN 50081-1
electromagnetic immunity EN 50082-2
shock protection 100 g (single shock) as per IEC 68-2-27
The linear scale GEL 177 is in strict conformity with Directive EMC 89/336/EEC of the European Union which is certified by the CE mark.
shock protection 100 g (single shock) as per IEC 68-2-27
vibration protection 5 g /10 ... 150 Hz as per IEC 68-2-6
data format - Gray
data length - 25 bits
output signal
voltage 0 ... + 10 V or + 10 ... 0 V, RL≥ 5 kΩ -
current 0 ... +20 mA or +20 ... 0 mA
4 ... +20 mA or +20 ... 4 mA
burden 0 ... 500 Ω

* referring to the measuring length

Synchronous serial interface, Pin layouts

Synchronous serial interface

Principles of Serial Data transmission

Number of distance measurements per second
measuring length 150 300 500 750 1000 2000
measurements 10000 6600 4500 3300 2500 1400

Baud Rate

The transmission rate depends on the line length and reaches a maximum of 1.5 MBaud. Use screened cables with paired wires.

Cable Length <50 <100 <200 <400
clock frequency [kHz] <400 <300 <200 <100

Pin Layout (analogue)
6-pole plug or cable outlet

Pin Layout Analogue - Linear Scale Gel 177

Pin Layout (SSI)
7-pole plug or cable outlet

Pin Layout SSI - Linear Scale Gel 177

Dimensioned drawings, Type code

Type code

Type Code - Linear Scale Gel 177

Other products relating to GEL 177 are: GEL 176, GEL 220