AI-TEK 70085-1010-081 70085 Series Passive Speed Sensors

The AI-TEK 70085-1010-081 (formerly branded as AIRPAX) is a premier example of engineering designed for the most demanding environments. As a member of the renowned 70085 Series, this passive variable reluctance speed sensor is the industry standard for critical control and protection circuits in applications ranging from power generation to aerospace .

What is the AI-TEK 70085-1010-081?

The AI-TEK 70085-1010-081 is a passive magnetic speed sensor that operates without an external power source. It utilizes proven variable reluctance technology to convert rotational motion into a precise AC voltage signal . Specifically designed for UL/CSA hazardous locations, this sensor thrives in environments where explosion-proof ratings are required . It features a 5/8-18 UNF mounting thread, a specific thread length of 1.500 inches (38.10 mm), and an overall sensor length of 2.75 inches, making it a direct replacement or OEM standard for numerous heavy-duty applications .

Key Technical Specifications (Specs)

Understanding the technical data of the 70085-1010-081 is crucial for proper system integration. Verified by multiple distributors and industrial suppliers, the core specifications include :

Manufacturer: AI-TEK (formerly AIRPAX)

Series: 70085

Part Number: 70085-1010-081

Type: Passive Variable Reluctance Speed Sensor

Thread Size: 5/8-18 UNF

Thread Length (A): 1.500 in (38.10 mm)

Output Voltage (Standard): 54 V (P-P)

Output Voltage (Guaranteed Point): 13.4 V (P-P)

DC Resistance: 240 Ohms (Max)

Typical Inductance: 30 mH (Reference)

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

Lead Length: 10 ft (3.05 m)

Output Polarity: White Lead Positive

Housing Ground: Green/Yellow Tracer

The Advantages of Passive Speed Sensors

Why choose the passive AI-TEK 70085-1010-081 over active sensors? The variable reluctance design offers inherent benefits that are critical for maintenance teams and engineers :

No Moving Parts & Longevity: With zero contacts or moving mechanisms, there is nothing to wear out. This results in a virtually unlimited operational lifespan when installed correctly .

Self-Powered Operation: The sensor generates its own signal from the rotating ferrous object (like a gear tooth). No external DC power supply is needed at the sensor point, simplifying wiring in remote areas .

High Reliability: The simple internal construction—a magnet, pole piece, and coil—ensures consistent performance even under extreme shock and vibration .

Environmental Resistance: Built to withstand temperatures up to 100°C standard (and higher in specialized versions), it resists moisture, corrosion, and industrial contaminants .