AI-TEK 70085-1010-131 High-Performance Passive Magnetic Speed Sensors

The AI-TEK 70085-1010-131 is a high-quality passive magnetic speed sensor designed for precision rotational speed measurement in demanding industrial environments. Manufactured by AI-TEK (formerly AIRPAX), a trusted leader in speed sensing technology for over 50 years, this sensor is part of the renowned 70085 series known for its rugged reliability and exceptional performance .

AI-TEK specializes in variable reluctance (magnetic pickup) sensors that operate without the need for external power, making them ideal for continuous duty in critical applications . The 70085-3030-131 model represents the culmination of decades of engineering expertise, delivering accurate speed sensing for turbine, compressor, motor, and pump monitoring systems across petrochemical, power generation, and heavy industrial sectors.

Unlike active sensors requiring external excitation, this self-generating passive sensor produces an AC voltage signal purely through magnetic induction as ferrous targets (such as gear teeth, keyways, or shaft irregularities) pass the sensor tip . This fundamental design ensures exceptional longevity and reliability in even the harshest operating conditions.

Key Technical Specifications

Understanding the precise specifications of the AI-TEK 70085-1010-131 is essential for proper application engineering. Below are the detailed parameters compiled from authoritative sources:

Parameter Specification Notes

Output Voltage (Standard) 54V (P-P) minimum Typical peak-to-peak output at rated conditions 

Output Voltage (Guaranteed Point) 13.4V (P-P) minimum Ensured minimum output for reliable triggering 

DC Resistance 240 Ohms maximum Coil resistance value for circuit design considerations 

Typical Inductance 30 mH reference Inductance value affects low-speed performance 

Output Polarity White lead positive Standard wiring configuration 

Operating Temperature -65°F to +212°F (-65°C to +100°C) Extended temperature range for harsh environments 

Lead Length 10 feet (3.05 meters) Standard integral cable length 

Housing Material Stainless steel Corrosion-resistant construction

Mounting Thread 3/8-24 UNF-2A Standard industry mounting interface

Physical Characteristics

Net Weight: Approximately 5 ounces (142 grams) maximum 

Construction: Fully sealed, waterproof, oil-resistant housing

Cable Type: Integral jacketed cable for environmental protection

Termination: Standard lead wires for field wiring