AI-TEK 70085-1010-411 Variable Reluctance Speed Sensor

Overview

The AI-Tek 70085-1010-411 is a heavy-duty variable-reluctance (VR) speed sensor engineered for precise rotational speed detection in extreme operating conditions. As a passive magnetic pickup, it generates its own signal without external power, ensuring dependable performance in environments where heat, vibration, and shock would compromise active sensors.

Designed for long-term stability and minimal maintenance, this model is widely deployed in industrial machinery, automotive systems, and aerospace propulsion applications where reliability and signal integrity are critical.

Operating Principle

The 70085-1010-411 operates on variable-reluctance technology. When a ferrous target such as a gear tooth or tone wheel passes the sensor tip, it disturbs the magnetic field and induces an AC voltage proportional to rotational speed. This non-contact sensing method eliminates mechanical wear and supports long service life.

Key Characteristics

• Passive, self-generating VR sensor design • No electronics at the sensing tip for improved thermal resistance • Stable signal output under high shock and vibration • Rugged stainless-steel construction for harsh environments • Flexible installation with threaded housing and extended cable

Technical Specifications

The following specifications reflect typical performance for the AI-Tek 70085-1010-411 and the 70085 series design.

Electrical & Performance • Sensor Type: Passive Variable Reluctance (VR) • Output Signal: AC voltage, speed-dependent • Standard Output Voltage: Up to 54 V peak-to-peak • Effective Speed Range: Approximately 200 to 3500 RPM (application-dependent) • Accuracy: ±1% of reading under stable conditions

Mechanical • Housing Material: Stainless Steel • Body Length: 1.875 in (47.6 mm) • Thread Type: 5/8-18 UNF (70085 series standard) • Installation Style: Threaded, face-mount • Lead Length: 10 ft (3.05 m) integral cable

Environmental • Operating Temperature Range: –65 °C to +100 °C • High Shock and Vibration Tolerance: Suitable for rotating machinery • Non-contact sensing: Immune to oil, dust, and debris contamination

Typical Applications

The AI-Tek 70085-1010-411 is well suited for speed monitoring in demanding environments, including:

• Industrial rotating equipment and gearboxes • Automotive wheel and drivetrain speed detection • Aerospace engine and accessory drive systems • Turbines, compressors, and pumps • General machinery protection and condition monitoring

Installation Notes

Optimal performance is achieved by maintaining proper air gap between the sensor tip and the ferrous target. Signal amplitude increases with speed and target geometry, allowing flexible integration with monitoring and control systems.

FAQ

Does the 70085-1010-411 require external power?

No. This is a passive VR sensor that generates its own output signal through magnetic induction.

Is this sensor suitable for high-temperature environments?

Yes. With an operating range up to +100 °C and no active electronics at the sensing element, it is well suited for elevated temperatures.

What type of output does this sensor provide?

The sensor produces an AC voltage signal whose frequency corresponds directly to rotational speed.