Overview
Explosion-proof analog absolute encoders SAS-M78 with 4–20 mA / 0–20 mA output are engineered for use in hazardous industrial environments, including zones with flammable gases, vapors, or combustible dust. The encoders provide deterministic absolute position feedback compatible with PLCs, motion controllers, and industrial monitoring systems.
The 78 mm reinforced housing ensures mechanical robustness and compliance with explosion-proof certification, making these encoders suitable for chemical, petrochemical, oil & gas, and mining applications.
Key Functional Features
- Analog Current Output: 4–20 mA or 0–20 mA for absolute position feedback
- Single-turn resolution: up to 21 bits
- Multi-turn capability: up to 14 bits
- Optional incremental output for hybrid control systems
- Stable signal under vibration, shock, and electrical interference
- Explosion-proof housing certified for hazardous areas
- Environmental protection: IP65 / IP67
These features ensure precise and reliable absolute position feedback in classified industrial zones.
Mechanical Protection and Mounting
The SAS-M78 series features reinforced standard housing suitable for hazardous conditions:
- Clamp flange – allows secure and repeatable mounting
- Blind hollow shaft flange – enables direct integration on existing shafts
Reinforced housing and sealed cable entries prevent ignition of surrounding flammable atmospheres.
Shaft Interface Options
- Solid Shaft – recommended when shaft alignment can be controlled, providing a stable mechanical reference
- Blind Hollow Shaft – suitable for retrofit or space-constrained installations
Correct shaft interface selection ensures both mechanical reliability and compliance with explosion-proof requirements.
Environmental Suitability
- Suitable for indoor and outdoor hazardous industrial environments
- Operates reliably under vibration and mechanical stress
- Rated for typical industrial temperature ranges
- Protected against dust, moisture, and contaminants
Proper installation practices, grounding, and cable routing are essential to maintain signal integrity and safety certification.
Typical Applications
- Chemical and petrochemical processing machinery
- Mining equipment in combustible dust zones
- Oil and gas production and handling systems
- Hazardous-area conveyor and material handling equipment
Explosion-proof SAS-M78 encoders provide deterministic absolute feedback critical for motion control, safety interlocks, and monitoring in hazardous zones.
Engineering Selection Summary
SAS-M78 explosion-proof analog current encoders combine certified reinforced housing with deterministic 4–20 mA / 0–20 mA output. Engineers must carefully consider shaft interface, mounting flange, and environmental classification to ensure safety, signal integrity, and long-term reliability.
Technical Reference
For detailed specifications and mechanical drawings, refer to the corresponding product documentation during final selection.
Reference：Explosion-Proof Analog Absolute Encoder SAS-M78 (4–20 mA / 0–20 mA)
