AI-TEK 70085-1010-037 70085 Series Passive Speed Sensor

The AI-TEK 70085-1010-037 is a high-performance Passive Speed Sensor from the renowned 70085 Series, engineered to deliver accurate and reliable rotational measurements in the most demanding industrial environments. As a Variable Reluctance (VR) speed sensor, it operates without the need for an external power supply, generating a signal solely from the rotation of a ferrous metal target, such as a gear tooth or shaft keyway . This self-powered operation makes the 70085-1010-037 an ideal choice for critical monitoring and control circuits where reliability is paramount .

Robust Design for Harsh Environments

The AI-TEK 70085-1010-037 is built to endure extreme conditions. With a housing constructed from durable materials and a design that features no moving parts, this sensor offers exceptional longevity and resistance to shock and vibration . It is specifically designed to perform reliably in a wide temperature range, typically from -55°C to +107°C, making it suitable for both high-heat applications like engine monitoring and cold-environment industrial processes . This rugged construction ensures consistent performance in applications ranging from aircraft engine controls to heavy industrial machinery .

Key Technical Specifications

Part Number: 70085-1010-037

Series: 70085 Series

Technology: Passive Variable Reluctance (Magnetic)

Output Voltage (Typical): 13V P-P (Peak-to-Peak) 

DC Resistance: 190 Ohms maximum 

Operating Temperature: -55°C to +107°C 

Thread Size: 3/8-24 UNF 

Housing Material: Stainless Steel 

Connection: 18-inch integral lead wires 

How the 70085-1010-037 Works

The operational principle of the AI-TEK 70085-1010-037 is based on variable reluctance technology. Inside the sensor is a permanent magnet, a pole piece, and a coil of wire . When a ferrous object (like a gear tooth) passes the sensor's tip, it disturbs the magnetic field. This disturbance induces an AC voltage signal in the coil that is proportional to the speed of the passing object . This signal is then transmitted to a control system or tachometer, such as the AI-TEK T77530 series, for processing and display .

Advantages of the AI-TEK 70085 Series

Choosing the 70085-1010-037 provides several distinct advantages for system designers and maintenance professionals:

Self-Powered Operation: Requires no external voltage source, simplifying wiring and enhancing reliability .

High Reliability: With no internal active electronics or moving parts, the risk of failure is significantly reduced .

Simple Installation: The robust threaded barrel design allows for easy mounting and secure installation in standard drill holes .

Versatility: It is effective in a wide variety of applications, from monitoring low-speed conveyors to high-speed turbines .

Common Applications

Due to its durability and precision, the AI-TEK 70085-1010-037 is widely used in industrial automation and process control. It is frequently specified for:

Monitoring pumps, motors, and fans to ensure proper operation .

Speed measurement in conveyor systems and rotating machinery .

Turbine and compressor protection in power generation and petrochemical facilities .

Critical applications in aerospace and automotive testing where accuracy is non-negotiable .

For engineers and procurement specialists seeking a reliable passive magnetic pickup, the AI-TEK 70085-1010-037 represents the gold standard in speed sensing. Its proven technology ensures accurate data for control systems, helping to prevent equipment failure and optimize industrial processes.