Baumer Hubner Encoder

Direct-Mount Hollow Shaft Design

• The blind hollow shaft (12–16 mm) or cone shaft (17 mm, 1:10 taper) mounts straight onto the motor shaft, avoiding the alignment work and extra mechanical link a coupling-based solid-shaft encoder requires.
• Electronics are protected during the shaft-mounting process itself, the design keeps sensitive internal components shielded from mechanical stress while the encoder is being slid onto the shaft and secured, reducing the risk of installation damage.
• An isolated blind hollow shaft helps prevent stray shaft currents from reaching the encoder's internal bearings, a common failure mode on motors driven by frequency converters.

Rated for High Shaft Loads

• Handles up to 200 N axial and 300 N radial shaft loading, a meaningful load capacity for an encoder mounted directly on a motor shaft rather than isolated on its own bracket and coupling.
• Motor shaft tolerance of 0.2 mm radial gives installers a defined, workable alignment tolerance rather than requiring precision shaft machining.
• Rated for 10,000 rpm mechanical operating speed with 6 Ncm operating torque.

Environmental and Mechanical Ruggedness

• IP66 protection (DIN EN 60529), a step up from typical industrial-duty sealing, suited to washdown-adjacent and dusty environments.
• Operating temperature range of -40°C to +100°C on the terminal box/connector versions, or -40°C to +80°C on the cable-output version.
• Corrosion protection tested to IEC 60068-2-52 (salt mist) and compliant with ISO 12944-5:1998 protective paint systems, category C4 relevant for coastal, marine-adjacent, or chemically aggressive plant environments.
• Vibration resistance to 10 g (10–2000 Hz, IEC 60068-2-27) and shock resistance to 100 g (6 ms), covering the mechanical stress typical of large rotating equipment.

Explosion-Protected Variants Available

• Rated for II 3 G Ex nA IIC T4 Gc (gas) and II 3 D Ex tc T135°C Dc (dust) hazardous area classifications, allowing direct use in Zone 2 gas and dust environments without a separate protective enclosure.

Flexible Connection Options

• Terminal box connection, M23 12-pin connector, or a 1 m cable output, selectable based on the panel wiring and cable routing already in place on the installation.
• Compact housing (99 mm flange dimension, approx. 1.1 kg) keeps the physical footprint manageable even with the added mechanical robustness.

Optional Upgrades for Higher-Demand Applications

• Hybrid bearing option — reduces the risk of electrical bearing damage from induced shaft currents, extending service life on VFD-driven motors.
• Function control with EMS — continuous monitoring of encoder operation for early fault detection, reducing unplanned downtime and shortening troubleshooting when an issue does occur.

Applications

• Direct motor-shaft mounting – any application where mounting via coupling isn't practical or where installation time needs to be minimized.
• Coastal, marine, and chemically exposed environments – C4-grade corrosion protection and salt mist testing suit port equipment, offshore-adjacent installations, and process plants with corrosive atmospheres.
• Hazardous area installations – ATEX-rated gas and dust variants allow use directly in classified Zone 2 areas.
• High ambient temperature or cold environments – the -40°C to +100°C operating range covers both extreme cold storage/outdoor winter conditions and hot industrial process areas.
• VFD-driven motor applications – the isolated hollow shaft design, with the optional hybrid bearing upgrade, protects against the electrical bearing damage common on frequency-converter-controlled drives.