Mini Rotary Encoder : Lightweight and Contactless Design

VLS-25

The Netzer VLS 25 Absolute Rotary Encoder is the smallest member of the VLS series, engineered for space and cleanroom applications demanding ultra-compact, high-precision motion control. With up to 21-bit resolution and 0.025 mdeg accuracy, this ultra-thin (<7 mm), ultra-lightweight (<4g) encoder ensures long-term, wear-free reliability in vacuum and contamination-sensitive environments.

Its contactless capacitive sensing technology makes it ideal for satellite positioning, optical instruments, wafer-handling robots, and high-accuracy positioning systems in semiconductor manufacturing.

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Features

COTS space-tested for reliable performance in demanding environments
Exceptional repeatability with high-precision rotary feedback
Wear-free operation enabled by contactless capacitive sensing
Best-in-class accuracy through scaled precision technology
Superior resistance to magnetic interference and EMI
Built for long-term durability with minimal maintenance needs

Unique Values

Small Size
Wide mounting
High precision
Scaled Precision

Accuracy

±0.025˚
Resolution

17-21 bit
OD

25 mm
ID

2.2 mm
Height

5.8 mm
Weight

8 gr

Technical Data

Technical Drawing

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General

Angular resolution 17-21 bit
Nominal position accuracy ±0.025°
Repeatability 2.7 mdeg / 9.9 Arcsec
Maximum operational speed 6,000 rpm
Measurement range Single turn, unlimited
Built In Test BIT Optional
Rotation direction Adjustable CW/CCW (Default same direction from bottom side of the encoder)

Mechanical

Allowable mounting eccentricity ±0.1 mm
Allowable axial mounting tolerance ±0.15 mm / ±0.2 mm using auto calibration
Rotor inertia 37.8 gr · mm²
Total weight 8 gr (including 250mm cable)
Outer Ø /Inner Ø / Height 25 / 2.2 / 5.8 mm
Nominal air gap (stator, rotor) 0.6 mm
Material (stator / rotor) FR4

Electrical

Supply voltage 5V ±5%
Current consumption ~110 mA
Interconnection Cable (standard 250mm)
Communication SSi / BiSS-C
Output code Binary
Serial output Differential RS-422
Clock frequency 0.1- 5.0 MHz
Position update rate 35 kHz

Environmental

EMC IEC 6100-6-2, IEC 6100-6-4
Operating temperature range -40°C to +105°C (Optional -55°C to +125°C)
Storage temperature -40°C to +105°C
Relative humidity 98% Non condensing
Shock endurance / functional 100g 6msec saw-tooth per IEC 60068-2-27:2009 40g 11msec saw-tooth per MIL-810G
Vibration functional 7.7grms @ 20 to 2000 Hz per MIL-810G Category 24
Protection IP 40

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OD
- 25 mm
- 60 mm
- 80 mm
- 100 mm
- 140 mm
- 170 mm
Output
- BiSS
- SSi
Resolution
- 17 bit
- 18 bit
- 19 bit
- 20 bit
- 21 bit
- 22 bit
- 23 bit
Bit
- BIT
Shaft-turn Counter
- 4,096
- 8,192
- 16,384
- 32,768
Cable Options
- Jacket and shielded cable
- Shielded cable
- Wires only
Cable length
- 250 mm Flying leads - 28AWG
- 500 mm Flying leads - 28AWG
- 750 mm Flying leads - 28AWG
- 1000 mm Flying leads - 28AWG
Rotor Type
- End Shaft - Single Screw Rotor
- Hollow Shaft Encoder
Custom
- High Temperature