AI-TEK 70085-1010-003 70085 Series Passive Speed Sensors

The AI-TEK 70085-1010-003, part of the renowned 70085 series, stands as a benchmark for passive variable reluctance (VR) technology. Designed and manufactured by AI-TEK Instruments (formerly Airpax), this sensor is engineered to deliver accurate, reliable rotational measurements in the most demanding applications, from heavy industrial machinery to critical aerospace systems .

What is the AI-TEK 70085-1010-003?

The 70085-1010-003 is a passive magnetic speed sensor that operates without the need for an external power source . It utilizes variable reluctance technology to generate an analog voltage signal when a ferrous metal object (such as a gear tooth, keyway, or shaft) passes the sensor’s tip. This "self-powered" operation makes it a versatile and dependable choice for continuous monitoring in remote or hazardous locations .

Key Technical Specifications

Part Number: 70085-1010-003

Series: 70085 Series

Thread Length (A): 2.625 inches (66.67 mm) 

Sensor Technology: Variable Reluctance (Passive) 

Output Voltage (Standard): 40V (P-P) 

Output Voltage (Guaranteed): 3.4V (P-P) at guaranteed point 

DC Resistance: 130 Ohms max 

Typical Inductance: 33 mH ref 

Operating Temperature: -55°C to +107°C (-67°F to 225°F) 

Body Shape: Cylindrical with Threaded Barrel 

Why Choose a Passive VR Sensor from the 70085 Series?

The AI-TEK 70085 series is trusted globally for its robust construction and fail-safe design. Here is why the 70085-1010-003 is the preferred choice for engineers:

1. Built for Extreme Conditions

Unlike active sensors, the passive design of the 70085-1010-003 contains no moving parts or active electronics . This eliminates internal wear and tear, allowing the sensor to withstand extreme shock, high vibration, and wide temperature fluctuations without failure. While the standard model operates up to 107°C, the passive VR platform itself is capable of functioning in environments approaching 425°C in specialized variants .

2. True Self-Powered Operation

Because the sensor generates its own signal from rotational motion, it requires no external power supply or wiring for excitation . This simplifies installation and is particularly advantageous in explosion-prone areas where running power lines is risky or regulated.

3. Versatile Application Range

Thanks to its flexibility, you will find the AI-TEK 70085 series deployed across a vast spectrum of industries :

Industrial Automation: Monitoring motor speed, conveyor belts, and rotary tables.

Heavy Machinery: Ensuring proper rotational speed on pumps, compressors, and gearboxes.

Aerospace & Defense: Proven reliability in flight-worthy aircraft engine controls .

Transportation: Speed sensing on railcar axles and automotive test equipment.

4. High Output Signal Strength

With a standard peak-to-peak output voltage of 40V, the 70085-1010-003 provides a strong, clear signal even at moderate speeds. The signal strength is directly proportional to surface speed, allowing for precise speed measurement and control .

Installation and Mechanical Details

The 70085-1010-003 features a specific thread length of 2.625 inches, making it suitable for applications requiring a deeper reach to the target wheel . Its threaded barrel design (likely 3/4-20 UNF, standard for the series) allows for simple installation and secure locking, ensuring the air gap between the sensor tip and the gear remains consistent .

For applications demanding a "fit and forget" solution, the AI-TEK 70085-1010-003 delivers. Its combination of passive technology, rugged mechanical build, and consistent electrical output makes it a gold standard for rotational speed sensing.

Keywords: AI-TEK 70085-1010-003, AI-TEK 70085 series, passive speed sensor, variable reluctance sensor, VR speed sensor, magnetic pickup, industrial speed sensor, tachometer sensor, 70085-1010-003 specification, AI-TEK Instruments.