AI-TEK 70085-1010-559 70085 Series Magnetic Speed Sensor

The AI-TEK 70085-1010-559 is a high-performance passive magnetic speed sensor designed for precise rotational speed measurement in demanding industrial environments. Manufactured by AI-TEK (formerly Airpax), a brand renowned for rugged sensing solutions, this sensor is engineered to provide reliable tachometer signals without requiring external power, making it an ideal choice for hazardous and remote monitoring applications .

This model is part of AI-TEK's extensive 70000 series, known for its robust construction and ability to generate clean digital signals from ferrous gear teeth, shafts, or other rotating targets. The 70085-3030-559 is specifically configured for applications requiring durability, extended temperature range, and seamless integration with control systems.

Key Features & Benefits

Passive Sensing Technology

Self-Powering Operation: Generates AC voltage signal solely from the movement of ferrous targets—no external excitation or power supply required

True Zero-Speed Capability: Produces usable output even at very low rotational speeds down to 0 RPM (depending on target size and air gap)

High Output Amplitude: Strong signal strength ensures reliable detection in electrically noisy environments

Robust Mechanical Construction

Stainless Steel Housing: 300 series corrosion-resistant body withstands harsh industrial conditions, moisture, and chemical exposure

Hermetically Sealed: Protected against ingress of dust, oil, water, and other contaminants (IP67 equivalent)

Integrated Connector: MS-style circular connector for secure, vibration-resistant electrical connection

Extended Temperature Range: Reliable operation from -55°C to +120°C, suitable for extreme environments

Superior Signal Integrity

Digital Square Wave Output: Clean, consistent pulses compatible with PLCs, counters, tachometers, and other digital input devices

High Noise Immunity: Differential output design rejects common-mode interference common in industrial settings

Wide Frequency Response: Accurately captures speeds from near-zero to over 20 kHz

Technical Specifications

Parameter Specification

Part Number 70085-1010-559

Type Passive Magnetic Variable Reluctance Sensor

Output Type AC Voltage (Sine Wave)

Housing Material 300 Series Stainless Steel

Thread Size 3/8-24 UNF-2A

Termination MS3106A-10SL-4S Connector

Temperature Range -55°C to +120°C

Protection Rating Hermetically Sealed (IP67 equivalent)

Mounting Threaded with jam nut

Gap Setting Adjustable via threaded body

Compatible Targets Ferrous gear teeth, slots, keyways, or discontinuities

Applications & Target Industries

The AI-TEK 70085-1010-559 excels in environments where reliability and safety are critical:

Oil & Gas Industry

Turbine speed monitoring on compressors and pumps

Engine RPM sensing for drilling rigs and generators

Compressor protection through overspeed detection

Power Generation

Gas and steam turbine tachometry

Hydroelectric plant speed monitoring

Emergency generator overspeed protection

Marine & Offshore

Propulsion engine speed sensing

Auxiliary machinery monitoring

Class society compliant installations

Heavy Industrial

Crusher and mill speed monitoring

Conveyor belt speed verification

Pump and fan protection systems

Rail & Transportation

Locomotive engine RPM measurement

Wheel slip detection systems

Traction motor speed feedback