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The AI-TEK 70085 Series represents the gold standard in passive variable reluctance (VR) speed sensor technology. Designed and manufactured by AI-TEK Instruments, LLC (formerly known for the AIRPAX brand), these sensors are engineered to deliver precise digital speed feedback in the most demanding industrial and aerospace environments .
For decades, engineers have relied on the 70085 series for its fundamental simplicity and exceptional durability. Unlike active sensors, these passive devices require no external power source to operate. They generate a strong AC voltage signal purely through the movement of ferrous metal targets (such as gear teeth) passing the sensor's pole piece . This self-powered operation makes them a fail-safe choice for critical control and protection circuits where reliability cannot be compromised.
Whether monitoring the rotational speed of a turbine in a power plant, ensuring the proper function of an aircraft engine, or managing heavy industrial machinery, the AI-TEK 70085 series provides a trustworthy, long-lasting solution .
2. Key Advantages: Why Choose the 70085 Series?
The 70085 series stands out in the market due to its rugged construction and proven performance. Here are the primary benefits that make it the preferred choice for engineers worldwide:
Unmatched Durability & Longevity: With no internal moving parts or contacts, these sensors eliminate the primary failure mode of other sensing technologies. This design results in a virtually unlimited operational lifespan and exceptional resistance to mechanical wear .
Self-Powered Operation (Passive): The sensor generates its own output signal (Voltage/Frequency) from the rotating target. This eliminates the need for a separate power supply and enhances system safety in hazardous or remote locations .
High Reliability in Extreme Environments: These sensors are built to thrive where others fail. They are capable of operating in temperatures ranging from cryogenic cold to extreme heat, with some variants handling up to 425°C (797°F) inside jet engines. They also withstand high shock and vibration without performance degradation .
Extreme Temperature Tolerance: The series offers a wide range of operating temperatures. While standard models cover -65°C to +100°C, specialized versions within the series can function in conditions approaching 425°C (797°F) , making them ideal for gas turbine and jet engine applications .
Simple Installation & Alignment: The sensors feature a straightforward threaded barrel design for easy mounting. The large air gap tolerance simplifies alignment, reducing installation time and complexity .
Versatility: The 70085 series includes a wide variety of shapes, sizes, thread lengths, and connector options, allowing them to be customized for virtually any application or environment .
3. Technical Specifications
The AI-TEK 70085 Series is a broad family with specific model numbers dictating precise mechanical and electrical characteristics. Below are the general specifications common to the series, along with examples of how different models offer specific performance parameters.
General Specifications (Series-Wide)
Specification Details
Technology Principle Variable Reluctance (Passive Magnetic)
Power Supply Self-powered; No external power required
Output Signal Type Analog AC Voltage (Sine Wave); Frequency
Body Shape Cylindrical; Threaded Barrel
Housing Material High-Grade Stainless Steel
Performance & Environmental Specifications (Model Dependent)
The exact specifications vary by model to suit specific application needs. The table below highlights the range of capabilities found within the 70085 series:
Parameter Example Model / Range Notes
Operating Temperature Standard: -67°F to +225°F (-55°C to +107°C)
Extended: -99°F to +450°F (-73°C to +232°C)
Extreme: Up to 425°C (797°F) Capable of handling both cryogenic and high-heat environments .
Output Voltage (Peak-Peak) Standard: 43V P-P ;
High Output: 54V P-P Output voltage varies based on gear speed and size.
DC Resistance (DCR) 130 ohms max (Standard)
240 ohms max (High Output) Indicates the sensor coil's resistance.
Typical Inductance 32-46 mH (Standard)
Thread / Body Length Varies by model: e.g., 1.500 in (38.1mm), 2.750 in (69.85mm), 4.000 in (101.6mm) Allows for proper positioning relative to the target gear.
Lead Length 10 ft (3.05 m) standard Custom lengths often available.
4. Popular Model Numbers & Variations
The 70085 series includes a vast array of part numbers to meet specific mechanical and electrical requirements. The numbering system typically encodes key attributes like thread size, body length, and connector type.
Common 70085 Series Models Include:
70085-1010-037 : High-accuracy variant for industrial applications
70085-1010-081 : 1.5" thread length, standard output
70085-1010-112 : Standard passive VR sensor
70085-1010-227 : High-temperature variant
70085-1010-330 : 4.0" body length
70085-1010-355 : Standard industrial sensor
A full list of models is extensive and includes variations in thread size, length, temperature range, and output characteristics.
5. Applications
Thanks to their robust nature, AI-TEK 70085 series sensors are utilized across a wide spectrum of industries:
Aerospace: Engine speed monitoring (compressor/turbine), accessory gearbox sensing .
Oil & Gas: Pump protection, turbine speed monitoring, compressor control .
Power Generation: Steam and gas turbine overspeed protection, generator speed feedback .
Industrial Manufacturing: Motor speed feedback, conveyor belt monitoring, machine tool control .
Rail & Transportation: Wheel slip/slide protection, traction motor speed sensing .
Marine: Engine RPM monitoring, propulsion system control .
6. Why the AI-TEK 70085 Series is the Right Choice
In the world of speed sensing, complexity can often lead to failure. The AI-TEK 70085 Series embraces the proven reliability of variable reluctance technology, packaged in a rugged housing designed to withstand the harshest conditions on Earth—and above it.
By choosing the 70085 series, you are investing in:
Decades of proven technology trusted by the aerospace and industrial sectors.
A maintenance-free solution with no moving parts to wear out.
Operational safety with self-powered, passive operation.
For precise, reliable, and durable speed monitoring, the AI-TEK 70085 series remains the industry benchmark.
