When choosing a hollow shaft absolute encoder, users prioritize reliable single-turn accuracy, robust output options, and easy integration with existing control systems. This guide highlights five top options featuring hollow shafts, 4-20mA or RS485 outputs, and true absolute position sensing. Read on to compare capabilities and find the model that best fits automated machinery, robotics, and industrial controls.
| Product | Brand | Output | Axis/ Shaft | Resolution |
|---|---|---|---|---|
| CALT CAS60 Absolute Encoder | CALT | 4-20mA | 360° Hollow Shaft (12 mm) | 12 Bit (4096 steps) |
| OSOBSUNC CAS38H12E06LB | OSOBSUNC | RS485 & 4-20mA | Blind Hollow Shaft 6 mm | 12 Bit |
| XVFSPWP CAS38H12E06LB | XVFSPWP | RS485 & 4-20mA | Blind Hollow Shaft 6 mm | 12 Bit |
| 12 Bit High Resolution CAS60H12E10RMB | VWOBBJYJ | RS485/ Analog | Blind Hollow Shaft 10 mm | 12 Bit |
| CALT CAS38 Absolute Encoder | CALT | RS485 | Blind Hollow Shaft 8 mm | 12 Bit |
CALT CAS60 Absolute Encoder Single Turn
The CALT CAS60 Absolute Encoder provides a full 360-degree single-turn measurement with a hollow shaft designed for easy integration in compact assemblies. It delivers a 12-bit resolution (4096 steps) and a 4-20 mA output option, enabling reliable current-based signaling in noisy industrial environments. The device features a 60 mm outer diameter and a blind hollow shaft with a 12 mm bore, balancing mechanical stiffness with installation flexibility. Applications range from robotics to automated conveyors where precise angular position is critical.
Key features include:
- 360-degree single-turn absolute sensing
- 12-bit resolution (4096 positions)
- 4-20 mA analog output for robust signaling
- Blind hollow shaft, 12 mm bore
- 60 mm outer diameter for sturdy mounting
Why choose this model
Ideal when a compact sensor with a straightforward analog interface is required. Its 4-20 mA output is compatible with many PLCs and control systems, and the hollow shaft reduces mechanical interference with rotating components.
OSOBSUNC CAS38H12E06LB Absolute Encoder
The OSOBSUNC CAS38H12E06LB is a 12-bit hollow-shaft absolute encoder featuring RS485 communication and a 4-20 mA analog output. Its 6 mm blind shaft is compact, making it suitable for space-constrained installations in automation, robotics, and material handling. The unit is built for stable performance and long service life, with emphasis on precision and reliable data transmission in industrial settings.
Key features include:
- 12-bit single-turn absolute encoding
- RS485 data interface plus 4-20 mA analog output
- Blind hollow shaft diameter 6 mm
- Outward 38 mm outer diameter (robust form factor)
Why choose this model
Best for teams needing both digital and analog signaling alongside a compact hollow shaft. Its RS485 compatibility enables multi-drop networks, making it suitable for centralized control rooms and distributed automation systems.
XVFSPWP CAS38H12E06LB Absolute Encoder
The XVFSPWP CAS38H12E06LB mirrors the 12-bit hollow-shaft absolute encoding design with RS485 and 4-20 mA signaling. Its 6 mm blind shaft keeps the footprint small while delivering precise angular data for automated equipment, packaging lines, and robotics. The combination of serial and analog outputs provides flexibility for legacy controllers and modern digital systems alike.
Key features include:
- 12-bit single-turn absolute encoding
- RS485 interface with 4-20 mA analog output
- Blind hollow shaft diameter 6 mm
- 38 mm outer diameter for sturdy installation
Why choose this model
This is a versatile choice for systems migrating from analog to digital signaling or requiring redundancy between digital and analog data paths. The compact shaft is well-suited to compact machinery and precision equipment.
12 Bit High Resolution CAS60H12E10RMB
The CAS60H12E10RMB delivers high reliability for industrial automation with a hollow shaft design and 12-bit resolution. Its 10 mm hollow shaft supports larger rotor assemblies while maintaining precise absolute position sensing. The device is built to perform across varied environments, reducing maintenance needs and extending equipment life. Interfaces often include RS485 and optional analog signaling depending on the exact model variant.
Key features include:
- 12-bit resolution for detailed positioning
- Blind hollow shaft with 10 mm bore
- RS485 or compatible interfaces (model dependent)
- Designed for diverse industrial environments
Why choose this model
Choose for demanding applications needing a slightly larger hollow shaft and robust signal integrity, especially in automation and logistics equipment where reliability is essential.
CALT CAS38 Absolute Encoder Single Turn
The CALT CAS38 Absolute Encoder offers a single-turn absolute sensing solution with a hollow shaft, designed for 8 mm shaft systems and 12-bit resolution. It supports RS485 output, enabling robust, multi-point networking in control architectures. The 38 mm outer diameter contributes to straightforward mounting in compact machinery, packaging lines, and automation setups where space is at a premium.
Key features include:
- Single-turn absolute sensing
- 12-bit resolution
- RS485 output
- Blind hollow shaft 8 mm
- 38 mm outer diameter
Why choose this model
Ideal for compact systems requiring reliable absolute feedback with a straightforward RS485 interface, particularly where an 8 mm hollow shaft is compatible with the mechanical design.
Buying Guide: Key Considerations For Hollow Shaft Absolute Encoders
When selecting a hollow shaft absolute encoder, consider the following factors to ensure optimal performance in your application:
- Output Interface: Choose between RS485, 4-20 mA, or both. RS485 supports longer runs and networked devices; analog 4-20 mA provides simple integration with older PLCs.
- Resolution: Higher bit counts offer finer position details. 12-bit encoders are common in many industrial setups, but confirm the required precision for your task.
- Shaft Size And Type: Hollow shaft diameter and bore length influence mechanical compatibility with movable shafts, gears, or couplings. Blind hollow shafts reduce exposed length and protect bearings.
- Electrical And Environmental Specs: Verify supply voltage range, temperature range, vibration tolerance, and EMI resilience to match your environment.
- Mounting And Form Factor: Outer diameter, mounting holes, and overall footprint affect ease of installation and serviceability in crowded panels.
- Longevity And Build Quality: Materials, seals, and configuration options impact reliability in industrial settings with dust, moisture, or contaminants.
- Compatibility With Controllers: Ensure your control system supports the chosen interface and data format, plus available configuration software or manuals.
- Maintenance And Replacement: Consider availability of spare parts, service intervals, and ease of recalibration if needed.
In multi-encoder installations, compatibility across devices matters. Prioritize devices with common protocols (RS485, 4-20 mA) and verify wiring diagrams against your existing control architecture. If your system demands fast, deterministic updates, prefer encoders with robust digital interfaces and well-documented engineering data. For space-constrained applications, the balance between a compact hollow shaft and required torque tolerance is essential.
Finally, assess total cost of ownership, including installation effort, maintenance, and potential retrofit compatibility with legacy equipment. The five models highlighted here offer a spectrum of signaling options, shaft sizes, and form factors to fit many hollow-shaft absolute encoder needs.