AI-TEK 70085-1010-214 70085 Series Passive Speed Sensors

The AI-TEK 70085-1010-214 is a high-performance variable reluctance speed sensor designed for precision speed measurement and control in demanding industrial environments . Manufactured by AI-TEK (formerly AIRPAX), a trusted leader in speed sensing technology, this sensor is part of the extensive 70085 series known for exceptional reliability and durability .

This passive magnetic speed sensor operates without the need for external power, generating its own voltage signal as ferrous metal targets pass through its magnetic field . The 70085-3030-214 model features a threaded barrel design for easy installation and secure mounting in permanent applications .

AI-TEK's variable reluctance sensors have been the technology of choice for decades in applications ranging from aircraft engine controls to industrial machinery protection, thanks to their simple construction and ability to withstand extreme conditions .

Key Specifications

General Specifications

Parameter Value

Brand AI-TEK

Part Number 70085-1010-214 

Product Type Variable Reluctance Speed Sensor 

Measurement Technology Variable Reluctance 

Output Type Voltage; Frequency 

Housing Style Cylindrical; Threaded Barrel 

Physical Specifications

Parameter Value

Diameter 0.6250 inch (15.87 mm) 

Length 6 inch (152 mm) 

Environmental Specifications

Parameter Value

Operating Temperature -65°F to 212°F (-65°C to 100°C) 

Environmental Resistance Withstands vibration, shock, moisture, oil, and corrosive atmospheres 

The 70085-1010-214 belongs to the 70085 series which typically offers output voltages up to 150V (P-P) with DC resistance around 1500 ohms and inductance of approximately 360 mH on comparable models .

Key Features & Advantages

1. Self-Powered Operation

The 70085-1010-214 requires no external power supply, generating its own output signal purely from the motion of ferrous metal targets . This simplifies installation, reduces wiring requirements, and eliminates the need for power connections in hazardous or remote locations.

2. No Moving Parts for Maximum Reliability

With absolutely no moving components or contacting surfaces, this sensor offers virtually unlimited mechanical life . The absence of wear mechanisms ensures consistent performance over decades of continuous operation, minimizing maintenance requirements and unplanned downtime.

3. Robust Construction for Harsh Environments

Engineered to excel in the toughest industrial conditions, the 70085-3030-214 withstands:

Extreme temperatures from -65°F to 212°F (-65°C to 100°C) 

High vibration and mechanical shock 

Contamination from dust, oil, water, and corrosive agents 

Humidity and salt spray exposure 

4. Simple Installation and Alignment

The threaded barrel design (0.625-inch diameter) allows for straightforward mounting using standard hardware . Installation requires minimal technical expertise, and the sensor can be easily aligned with the target gear or wheel for optimal signal generation .

5. Proven Variable Reluctance Technology

Based on decades of field-proven technology, the variable reluctance principle ensures reliable operation in applications where other sensing methods might fail . This technology has been trusted in critical applications from aircraft engines to industrial turbines.

6. Wide Application Flexibility

The 70085-1010-214 adapts to numerous measurement requirements including speed, position, and timing applications across diverse industries .

Technical Principles

The 70085-1010-214 operates on the variable reluctance principle . Inside the sensor, a permanent magnet creates a magnetic field that extends beyond the sensor tip. A coil of wire surrounds this magnet. When a ferrous metal object (such as a gear tooth, turbine blade, or shaft keyway) passes through this magnetic field, it temporarily alters (reluctes) the magnetic path. This change in magnetic flux induces a voltage in the coil, generating an AC signal that corresponds to the passing of each target .

The frequency of this output signal is directly proportional to the speed of the rotating target, while the amplitude varies with both speed and the air gap between sensor and target.