Hengstler RX71TI/ 1000EK.72XX-K0-S 0539891 Explosion-Proof Encoder

Hengstler RX71TI/ 1000EK.72XX-K0-S Incremental Rotary Encoder (MPN: 0 539 891)

The Hengstler RX71TI/ 1000EK.72XX-K0-S (Part Number: 0 539 891) is an extreme-environment, flameproof incremental optical rotary encoder engineered specifically for hazardous operating locations in offshore drilling, marine propulsion systems, chemical refining, and industrial bulk handling. Housed in a solid 316-grade stainless steel enclosure (70 mm body diameter) with high-integrity labyrinth sealing, the RX71TI provides certified ATEX / IECEx Zone 1/21 (Ex d IIC T4/T6 Gb / Ex tb IIIC Db IP6X) protection against explosive gases, volatile vapors, and conductive combustible dust.

Key Features

1. Heavy-Duty 316 Stainless Steel Enclosure: 70 mm heavy-wall stainless steel flameproof design engineered for marine salt spray, caustic washdowns, and continuous chemical exposure.
2. ATEX & IECEx Dual Certified: Rated for gas (Zone 1, Ex d IIC T4/T6 Gb) and dust (Zone 21, Ex tb IIIC T135°C/T85°C Db) hazardous areas under EC-Type Examination.
3. High-Precision Optical Resolution: 1,000 PPR with 90° electrical quadrature phase shift and gated index pulse for precise position, velocity, and dynamic angle feedback.
4. Robust Push-Pull Complementary Output: Differential 10–30 VDC driver capable of driving high capacitive loads up to 100 kHz frequency response over extended cable distances.
5. High Environmental & Mechanical Rating: IP67 submersible/washdown ingress protection with 10 mm precision solid shaft tolerating up to 100 N radial and 40 N axial dynamic shaft loading.

Industrial Applications

• Winch Drum & Drawworks Monitoring: Precise positioning and speed regulation in hazardous deck equipment.
• Marine Fuel Oil Viscosity & Flow Blenders: Flow rate and pump displacement speed feedback in Ex Zone 1 engine spaces.
• LNG / LPG Gas Carrier Valves: Quarter-turn and multi-turn explosion-proof actuator position feedback.
• Offshore Mud Mixing & Shaker Units: Constant rotational speed control in explosive hydrocarbon gas atmospheres.
• Hazardous Area Paint Coating Lines: Automotive and maritime electrostatic paint booth robotic arm positioning.

Compatible Industrial & Marine Systems

• Offshore Drilling Drives: Top-drive speed monitoring, drawworks drum tracking, and mud pump stroke counter modules (e.g., Tesco, NOV, Cameron).
• Marine Automation & Propulsion: Azimuth thruster steering position feedback, controllable pitch propeller (CPP) systems, engine telegraphs, and anchor windlass controllers.
• Cranes & Winches: Deck winches, explosion-proof container crane hoists, davits, and dynamic positioning capstans.
• Petrochemical Process Machinery: Ex-rated paint spraying robots, silo level monitors, chemical mixing vessels, and high-pressure fuel metering skids.

Frequently Asked Questions

What is the difference between Hengstler RX70 and RX71 encoder models?

The RX70 features a hard-anodized aluminum enclosure designed for standard industrial hazardous environments, whereas the RX71 is manufactured from solid 316-grade stainless steel. The RX71 is engineered specifically for marine, offshore, coastal salt spray, and corrosive chemical washdown environments.

Why are complementary signals critical in marine systems?

Complementary (differential) signals allow the receiving high-speed counter card to reject common-mode electromagnetic interference (EMI). Any noise induced across the cable is cancelled out at the differential receiver stage, preventing missed pulse counts in high-noise VFD environments.

What maintenance is required on the explosion-proof shaft seal?

The dynamic shaft seal and bearing pack are sealed for life (rated IP67). Maintenance is limited to visual inspection of the stainless steel flame gap and checking the coupling for wear, backlash, or radial misalignment during routine dry-dock or annual planned maintenance cycles.