Headquarters: SIKO GmbH Weihermattenweg 2 79256 Buchenbach Germany Phone+49 7661 394-0

Wire-actuated encoder SG42

robust design and redundant sensor system with 4000 mm measuring length

Wire-actuated encoder with redundant acquisition of linear measurement distances with a max. measuring length of 4000 mm.

Profile SG42:

  • Robust design
  • Measuring lengths up to 4000 mm
  • Analogue signal output in redundant design (2x 4…20 mA or potentiometer)
  • Variable mounting options
  • Lockable vent and water drain holes
  • Very robust measuring rope (stainless steel)
  • IP65 protection category
  • M12 plug connection

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Mechanical data
FeatureTechnical dataAdditional information
Wire designø0.87 mm

steel rope (stainless), plastic-coated

Extension force≥8 N
Measured distance/ rope drum revolution200 mm
Absolute accuracy±0.35 % relating to measuring length (mm)
Weight~0.79 kg
Electrical data
Encoder potentiometer
FeatureTechnical dataAdditional information
Operating voltage≤30 V

power loss on the potentiometer <1 W

Power rating2 W at 70 °C
Resistance10 kΩ
Resistance tolerance±5 %
Standard terminal resistance0.5 % or 1 Ω

the higher value always applies

Linearity tolerance±0.25 %
Type of connection

M12 plug connector (A-coded)

8-pole, 1x pin

Transducer, power output
FeatureTechnical dataAdditional information
Operating voltage10 … 30 V DC

with load impedance ≤500 Ω voltage between I+ and I-

Output current4 … 20 mA


4/20mA 4/20mA

20 … 4 mA


20/4mA 20/4mA

4 ... 20 mA, 20 ... 4 mA

4/20mA 20/4mA

Type of connection

M12 plug connector (A-coded)

8-pole, 1x pin

Measurement transducers permit optimum adjustment of the output current and output voltage to the measuring range. The measurement transducer is pre-set at the works so that an output signal of 4 … 20 mA or 20 …4 MA is available. 

System data
FeatureTechnical dataAdditional information
Repeat accuracy ±0.25 mm

per direction of approach

Travel speed≤800 mm/s
Failure rate166.7 year(s)

at 60 °C (MTBF)

Ambient conditions
FeatureTechnical dataAdditional information
Ambient temperature-40 … 80 °C
Protection category

IP65 (for electronic unit)

EN 60529, Certonal-coated electronic unit

Wire-actuated encoder SG42
Pin assignment
Potentiometer pin assignment
SignalPINAdditional information
Po 1 Potentiometer 1
Po 2 Potentiometer 2
S 3 Potentiometer 2
Pe 4 Potentiometer 2
nc 5  
Pe 6 Potentiometer 1
S 7 Potentiometer 1
nc 8  
Transducer pin assignment
SignalPinAdditional information
I+ 1 Transducer 1
I+ 2 Transducer 2
nc 3  
I- 4 Transducer 2
nc 5  
I- 6 Transducer 1
nc 7  
nc 8  
Hint for mounting

When securing the wire it must be ensured that the wire is straight and vertical in relation to the wire outlet.  Recommendation: Only select the starting position after an unwound length of approx. 5 mm. This prevents the wire hitting the end stop when it is rewound. 

SG42 Hint for mounting
Symbolic representation

Scope of delivery
  • SG42
  • Mounting instructions
Ordering table
Feature Order data Specifications Additional information
Measuring range
3300, 3700, 4000 in mm
Encoder type
2x potentiometers 10 kΩ
2x transducers 20…4 mA
2x transducers 4…20 mA counter-rotating
2x transducers 4…20 mA
Position of electrical connection
0 °
180 °
Series impedance
0 Ωonly for P10_10 encoder type
1.2 kΩonly for P10_10 encoder type
Ordering key

SG42 - A - B - C - D

additional accessoriesOrdering key
Mating connector,

8-pole, socket


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Anja Wickersheim

Anja Wickersheim
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