Compact Encoder for High-Precision Applications

VLT-25

The Netzer VLT-25 Absolute Rotary Encoder is an ultra-compact (<7 mm thin) and ultra-lightweight (<4g) solution, delivering up to 21-bit resolution with 0.025 Degree accuracy. Designed for tight-space applications, this miniature rotary encoder provides high-precision, contactless capacitive sensing for long-term, wear-free reliability in demanding motion control environments.

Perfect for aerospace, robotics, medical devices, and compact industrial automation, the VLT-25’s ultra-small, hollow, low-inertia design minimizes system weight while maximizing performance. When size constraints require the most precise rotary feedback, the VLT-25 provides industry-leading accuracy in a miniature package.

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Features

Compact and lightweight design for minimal system impact
High precision rotary feedback with exceptional repeatability
Contactless capacitive sensing for wear-free operation
Low power consumption for efficient energy usage
Excellent resistance to EMI and magnetic interference
Designed for extended service life and minimal maintenance

Unique Values

Small Size
Wide mounting
High precision
Scaled Precision

OD

25 mm
ID

2.2 mm
Height

5.8 mm
Weight

8 gr
Resolution

17-21 bit
Accuracy

±0.025˚

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 8,000 rpm
Measurement range Single Turn absolute with optional shaft turn counter
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 ~90 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 (Optional - up to 375 kHz)

Environmental

EMC IEC 6100-6-2, IEC 6100-6-4
Operating temperature range -55°C to +125°C
Storage temperature -55°C to +125°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

Mini Rotary Encoder using absolute rotary encoder technology

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OD
- 25 mm (ID - 2.2 mm)
- 60 mm (ID - 25 mm)
- 80 mm (ID - 35 mm)
- 100 mm (ID - 48 mm)
- 140 mm (ID - 90 mm)
- 170 mm (ID - 110 mm)
- 247 mm (ID - 171 mm)
Communication
- BiSS
- SSi
Resolution
- 17 bit
- 18 bit
- 19 bit
- 20 bit
- 21 bit
- 22 bit
- 23 bit
BIT
- Disabled
- Enabled
Shaft-turn Counter
- 2,048
- 4,096
- 8,192
- 16,384
- 32,768
- None
Cable Type
- Jacket and shielded cable
- Shielded cable
- Wires only
- ESA Space Cable
Cable Length
- 250 mm Flying leads - 30AWG
- 500 mm Flying leads - 30AWG
- 750 mm Flying leads - 30AWG
- 1000 mm Flying leads - 30AWG
- 250 mm Flying leads - 28AWG
- 500 mm Flying leads - 28AWG
- 750 mm Flying leads - 28AWG
- 1000 mm Flying leads - 28AWG
Rotor Type
- Hollow Shaft Encoder
- End Shaft - Single Screw VL25
- Shaft with Insert
Coating
- Standard Conformal
- Parylene