AI-TEK 70085-1010-018 70085 Series Passive Speed Sensors

The AI-TEK 70085-1010-018 belongs to the renowned 70085 Series of passive speed sensors, designed for engineers and maintenance professionals who demand uncompromising performance in challenging industrial applications. Utilizing proven variable reluctance (VR) technology, this sensor delivers precise rotational speed measurements without the need for external power, making it an ideal choice for critical monitoring and control systems .

Key Features and Benefits

Self-Powered Operation

Unlike active sensors requiring separate power supplies, the AI-TEK 70085-1010-018 generates its own voltage signal as ferrous targets pass the sensor tip. This self-powered design simplifies installation and reduces wiring complexity, particularly beneficial in remote or hazardous locations .

Robust Mechanical Construction

Engineered for longevity, this sensor features a stainless steel threaded barrel housing with no moving parts or internal contacts. This contactless design eliminates mechanical wear, ensuring decades of reliable service even under continuous high-vibration conditions .

Extended Temperature Range

The 70085-1010-018 operates reliably across an extremely wide temperature spectrum from -65°F to +225°F (-55°C to +107°C) , suitable for both cryogenic applications and high-heat environments near engines or turbines .

High Output Signal

With a typical output voltage of 40V (P-P) and a guaranteed minimum of 3.4V (P-P) at the defined test point, this sensor provides strong, clean signals even at moderate speeds. The DC resistance is a maximum of 130 ohms with a reference inductance of 33 mH .

Technical Specifications

Parameter Value

Part Number 70085-1010-018

Series 70085 Series

Thread Length 3.625 inches (92.07 mm) 

Output (Typical) 40V P-P

Output (Guaranteed) 3.4V P-P

DC Resistance 130 ohms max

Typical Inductance 33 mH ref

Output Polarity Pin "B" positive

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

Housing Material 300 Series Stainless Steel 

Weight 5 oz. maximum

Applications and Use Cases

The AI-TEK 70085-1010-018 excels in environments where reliability cannot be compromised:

Industrial Rotating Machinery: Monitoring pumps, compressors, gearboxes, and conveyor systems for overspeed detection or process control .

Engine and Turbine Monitoring: Suitable for integration into safety systems requiring non-contact speed sensing of gear teeth or shaft keyways .

Aerospace and Defense: Built to withstand the extreme shock, vibration, and temperature variations found in aircraft engine controls and auxiliary power units .

Automotive Testing: Employed in dynamometer cells and engine test stands where accurate RPM measurement is essential .

Hazardous Locations: When connected to appropriate safety barriers, these passive sensors are ideal for explosive environments due to their inherently low-energy operation .