Description
The Baumer OSE105S2 is a robust incremental hollow-shaft rotary encoder from the OSE series (Ø58 mm), designed for direct mounting onto motor or drive shafts (hollow shaft design eliminates couplings). It provides 1024 pulses per revolution (PPR) with Push-Pull (HTL / TTL compatible) output, enabling precise speed and position feedback in harsh industrial environments.
- OSE105S2 → Hollow shaft Ø 10 mm (or 6/8/10/12 mm — check variant; 105 = 10 mm hollow typical), 1024 ppr, Push-Pull (A / B / Z channels), 5 m integral cable (M12 connector versions exist in other OSE codes — S2 often = cable outlet 2m/5m depending on region; here “S2” = standard cable length — confirm exact meterage on label).
- Hollow Shaft Design: Slides directly onto motor shaft — secured by spring clamp / locking screw (no flexible coupling needed).
- Protection: IP65 (with proper sealing) — resists dust, oil mist, and splash.
- Supply: Typically 10–30 V DC (Push-Pull versions often 10–30V DC wide range; some TTL-only versions 5V — OSE105S2 Push-Pull = 10–30V DC common).
The OSE series is widely used on conveyor drives, hoists, winders, and general machinery as a cost-effective alternative to flange-mount encoders.
Key Features
- Hollow Shaft Mounting: Direct onto shaft (Ø 10 mm typical) — no coupling backlash
- Resolution: 1024 PPR (4096 counts/rev in quadrature x4 mode)
- Output: Push-Pull (HTL/TTL compatible) — A, B, Z + /A, /B, /Z (complement channels included on most Baumer Push-Pull)
- Supply Voltage: 10–30 V DC (standard for HTL Push-Pull OSE)
- Cable / Connection: 5 m (or 2 m — S2 suffix often implies cable outlet; verify length) shielded cable with flying leads or M12 depending on full code — OSE105S2 typical = 5 m cable
- Max. Speed: Mechanical ≤ 6000 rpm (check exact), Electrical ≤ 300 kHz (limits max rpm at given PPR: 300k / 1024 ≈ 293 rpm max electrical — verify your application speed)
- Country of Origin: Switzerland / Germany / Czech Republic (Baumer Group)
Model & Specification Reference (Baumer OSE Series Example)
Model Code Segment | Meaning (OSE105S2 context) |
|---|---|
OSE | Ø 58 mm Hollow-Shaft Incremental Encoder Series |
1 0 5 | 10 = Hollow shaft Ø 10 mm; 5 = 1024 PPR (some decode: 105 = 10mm hollow + std spec) |
S2 | Cable outlet (often 2 m or 5 m cable — S2 = cable; M = M12 plug) — length per region stock |
Full code may include: OSE105S2 — sometimes extended as OSE105S2 — complete with flange clamp & fixing screw |
⚠️ Important Installation & Selection Notes:
Hollow Shaft Size: OSE105 = Ø 10 mm hollow. If your motor shaft is Ø 6 mm / Ø 8 mm / Ø 12 mm — need OSE106 / OSE108 / OSE112 respectively (or use sleeve bushing — not recommended for high vibration). Verify shaft diameter! Push-Pull vs Open Collector / RS422 (TTL-Line Driver): OSE105S2 Push-Pull works with 10–30V DC supply and drives both PLC high-speed counter inputs & simple counters. If your input REQUIRES RS422 differential (long cable, noise immunity) → need OSE105S2 with Line Driver (TTL/RS422) — different suffix. Phase Sequence (A/B Quadrature): Standard is A leads B for CW rotation (viewed from shaft end — check Baumer phase diagram). Swap A/B wiring if direction reversed needed. Max. Electrical Speed: At 1024 PPR, max frequency is typically 100–300 kHz → max rpm = f_max / PPR. For 300 kHz → ~293 rpm. If you need high-speed (>1000 rpm) at 1024 PPR → confirm encoder max freq spec (some OSE rated 300 kHz; others 100 kHz → 97 rpm). For high-speed, consider lower PPR or check OSE with 100 kHz+ rating. Mounting: Use supplied clamping screw / spring element — ensure hollow bore is clean & shaft has flat for setscrew (some variants have grub screw onto shaft flat). Do NOT overtighten — hollow body is aluminum alloy.
Technical Specifications (OSE105S2 — 1024 ppr, Push-Pull, Hollow Ø10 mm, 5 m Cable)
Parameter | Specification |
|---|---|
Model / Order Code | OSE105S2 (Baumer OSE Series Incremental Hollow-Shaft Encoder) |
Encoder Type | Incremental (Quadrature A/B + Zero Pulse Z) |
Resolution | 1024 Pulses Per Revolution (PPR) — 4096 edges/rev in x4 mode |
Shaft Type / Size | Hollow Shaft Ø 10 mm (typical for OSE105) — depth ~ 20 mm |
Output Type | Push-Pull (HTL/TTL compatible) — Channels A, B, Z + complements /A, /B, /Z (6 channels total on cable) |
Supply Voltage | 10–30 V DC (typical for Push-Pull version) |
Current Consumption | ≤ 80 mA (no load) |
Max. Output Frequency | 100 kHz … 300 kHz (depends on production — check label; assume 100 kHz min) |
Zero Pulse (Z) | 1 pulse per revolution — width = 1/4 period of A phase |
Connection | Shielded cable — 5 m (S2 suffix often = cable outlet; verify exact length on label — some regions S2 = 2 m) |
Housing Diameter | Ø 58 mm |
Protection | IP65 (with proper cable gland & sealing) |
Operating Temp. | -20 … +70 °C (some -40 … +85 °C depending on batch) |
Weight | ~ 0.25 kg |
Standards | CE, RoHS |
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty (rotation test on calibration rig — check A/B/Z phase sequence & index pulse)
- Technical support for:
- Shaft size confirmation (OSE105 = Ø10 mm hollow; OSE106 = Ø6 mm; OSE108 = Ø8 mm; OSE112 = Ø12 mm)
- Push-Pull vs Line Driver (RS422) selection — match to your PLC high-speed counter input type
- Wiring diagram (A/B/Z/Supply/Shield — typical 6-wire + shield: +Ub, 0V, A, B, Z, Shield; complements /A /B /Z may be on same cores if 6+3 wire — verify pinout sticker)
- Direction sense (swap A/B if rotation direction reversed in PLC count)
- Alternative: Flange-mount EIL580 / ITD series if hollow shaft not suitable
- Optional spring-element mounting kits, coupling sleeves (if stepping up from smaller shaft) — check feasibility
Delivery Time
- Standard delivery: 3-5 working days (stock items)
- Express shipping available upon request
Why Choose Our Store
- Genuine Baumer OSE encoders — not copies with misaligned discs / weak bearings
- Global supply network with competitive pricing
- Expertise in encoder selection (hollow vs flange, PPR vs max freq, Push-Pull vs Line Driver)
- Comprehensive technical documentation (phase diagram, wiring color code, shaft fit tolerance)
- Responsive customer service and support
Applications
- Conveyor / Web Line Speed Feedback: Directly on drive roller shaft — no coupling backlash.
- Hoist / Crane Positioning: Hollow mount on drum shaft for turns-count → linear position.
- Winders / Unwinders: Diameter calculation via RPM feedback.
- General Machine Retrofit: Replace worn flange encoder — hollow shaft simplifies mounting if shaft accessible.
- Packaging / Converting: Register mark synchronization via encoder count.




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