Overview

This document presents detailed technical specifications, applications, and installation guidelines for Hall effect speed and direction sensors designed to detect rotary movement of ferrous toothed or phonic wheels. These sensors provide dual digital frequency outputs with a ±90° phase difference to determine rotation direction (clockwise or counterclockwise). Manufactured by ELEN S.r.l., they target industrial, automotive, agricultural, railway, nautical, and military sectors.

Applications

• Engines, differential gears, transmissions, turbines, pumps, racks
• Automotive systems including ABS brakes
• Agricultural and earth-moving machinery
• Industrial, railway, nautical, and military applications (upon request)

Key Features and Specifications

• Detection and Precision: High precision with ±90° phase displacement between output signals; frequency detection from zero speed after startup.
• Operating Conditions: Temperature range from -40°C to +150°C; storage temperature -60°C to +150°C.
• Mechanical and Environmental Robustness: IP67 rating ensuring dust-tight and water-resistant operation; high mechanical strength; corrosion resistance.
• Electrical Characteristics: Power supply voltage ranges from 4.5 to 30 V DC (5.5 to 20 V DC for 2-wire versions); output current up to 350 mA; output frequency up to 10-12 kHz; open collector or PWM current output signals.
• Protections: Overvoltage (up to 36 V DC for 5 minutes), reverse polarity (-20 to -30 V DC for 1 hour), short circuit, overload, and electrostatic discharge protection up to 2000 V (HBM standard MIL-STD-883 method 3015).
• Vibration and EMC Compliance: Vibration resistance of 1 mm amplitude at 100 Hz (~8g); EMC compatibility compliant with BCI Class “A” or “C” standards (1-400 MHz).
• Housing and Mounting: OT58 lathed material housing; tightening torque limited to 25 Nm; flange or adjustable fastening options depending on sensor type.

Sensor Types

Type 1 - Hall Effect Speed and Direction Sensors

• Double Hall effect sensor with ±90° phase-shifted output signals (signals A and B).
• Fixed flange mounting.
• Includes connection diagrams, output waveforms, and minimum wheel dimension and axis inclination specifications.

Type 2 - Hall Effect Speed and Direction Sensors

• Double Hall effect sensor with ±90° phase displacement output signals.
• Adjustable fastening for flexible installation.
• Similar application sectors and detailed technical diagrams as Type 1.

Technical Diagrams and Data

• Output signal waveforms illustrating phase displacement between signals A and B to determine rotation direction.
• Connection schematics for sensor wiring, including power supply, ground, and ECU inputs.
• Functional block diagrams of sensor operation.
• Minimum wheel dimensions and permissible reading axis inclination angles to ensure accurate sensor readings.

Critical Parameters and Recommendations

• Maintain correct interpretation of phase difference between signals A and B for accurate rotation direction detection.
• Keep operating temperature within -40°C to +150°C for reliable performance.
• Use appropriate fastening method (flange or adjustable) and do not exceed 25 Nm tightening torque to avoid mechanical damage.
• Maintain air gap between sensor and wheel between 0.2 mm and 1 mm for optimal signal accuracy.
• Follow wiring diagrams precisely, incorporating recommended protective components (capacitors, diodes, load resistors) to prevent electrical faults and transient voltage damage.
• Ensure environmental protections (IP67, corrosion resistance) are considered when installing in harsh conditions.
• Verify vibration and EMC compliance in the application environment to guarantee sensor reliability.

Output Signal Characteristics

• Two-wire versions output a PWM current signal with two current levels representing logical states: 7 mA (low) and 14 mA (high).
• Output frequency up to 12 kHz; direction sensing valid up to 3.3 kHz.

Summary

The Hall effect speed and direction sensors from ELEN S.r.l. are robust, precise, and versatile devices suitable for demanding industrial and automotive environments. Their dual output signals with defined phase displacement enable accurate detection of rotational speed and direction. The sensors support wide temperature ranges, strong mechanical and environmental protections, and multiple mounting and connection options. Proper installation, including adherence to air gap, wheel dimension, and wiring guidelines, is essential to ensure optimal sensor performance and longevity.