Product Overview

The AI-TEK 70085-1010-003 stands as a cornerstone in industrial speed sensing technology. This passive magnetic speed sensor (variable reluctance) converts mechanical motion into electrical signals without requiring an external power supply. AI-TEK, a leader in high-precision sensing, engineered this specific model to provide a robust 40V Peak-to-Peak (P-P) standard output, making it ideal for monitoring rotating machinery in demanding sectors like power generation, automotive testing, and heavy manufacturing.

The 70085-1010-003 features a durable stainless steel housing and a 5/8-18 UNF thread, ensuring compatibility with standard industrial mounting ports. Its passive design ensures long-term reliability because it contains no moving parts or internal electronic circuits that might fail over time. By detecting changes in the magnetic field as gear teeth or targets pass the sensor tip, it provides a frequency signal directly proportional to the rotational speed.

Exceptional Performance and Construction

This sensor excels in providing a clean, high-voltage signal even at varying speeds. While the standard output reaches 40V P-P, AI-TEK guarantees a minimum output of 3.4V P-P under specific test conditions, ensuring your control system receives a readable pulse even at lower RPMs.

The physical dimensions support versatile installation. With a thread length of 2.625 inches and a total sensor length of 3.75 inches, it fits comfortably into deep-set gear housings. The internal coil maintains a maximum DC resistance of 130 ohms, optimizing the electrical characteristics for long-distance signal transmission. Furthermore, the sensor employs a standard connector termination, which facilitates quick replacement and secure wiring in high-vibration environments.

Technical Specifications

The AI-TEK 70085-1010-003 follows rigorous engineering standards to ensure precision:

• Thread Size: 5/8 – 18 UNF.
• Thread Length: 2.625 inches.
• Total Sensor Length: 3.75 inches.
• Output Voltage (Standard): 40 V (P-P).
• Guaranteed Output Voltage: 3.4 V (P-P).
• DC Resistance: 130 ohms maximum.
• Operating Temperature: -55°C to +107°C.
• Output Polarity: Pin ‘B’ positive.
• Termination: Integrated Connector.
• Shipping Weight: 2.1 kg (Bulk/Industrial packaging).

Industrial Applications

The 70085-1010-003 serves a wide range of critical monitoring tasks:

1. Turbine Speed Monitoring: Provides real-time RPM data for steam and gas turbines to prevent overspeed conditions.
2. Engine Diagnostics: Tracks crankshaft or camshaft speeds in large-scale industrial engines.
3. Conveyor Systems: Monitors belt speeds and detects stalls in mining or material handling facilities.
4. Gearbox Analysis: Mounts directly to gear housings to measure output shaft speed in heavy-duty transmissions.
5. Flow Metering: Works with turbine-type flow meters to translate fluid velocity into readable electronic data.

Installation and Wiring Details

For optimal performance, maintain a consistent air gap between the sensor tip and the target gear. A smaller air gap typically results in a higher output voltage. AI-TEK specifies that Pin ‘B’ carries the positive polarity, which is crucial for systems requiring phase-sensitive speed detection.

The rugged construction allows the sensor to operate in temperatures as low as -55°C and as high as +107°C. This wide thermal range makes it suitable for outdoor installations or engine compartments where temperature fluctuations occur frequently. Because the 70085-1010-003 uses a connector termination rather than flying leads, maintenance teams can swap sensors in minutes without rewiring the entire junction box.

Frequently Asked Questions

Does this sensor require a power supply?
No, the 70085-1010-003 is a passive magnetic pickup. It generates its own voltage signal through electromagnetic induction as a ferrous target passes the sensor tip.

What is the significance of the 130-ohm DC resistance?
The DC resistance indicates the health of the internal coil. A reading significantly higher than 130 ohms or a reading of infinity suggests a break in the coil, whereas a very low reading might indicate a short circuit.

Can I use this sensor in wet environments?
While the sensor features a robust design, you should ensure the connector interface is properly sealed or use a compatible mating cable with environmental protection if moisture exposure is expected.

How do I adjust the output voltage?
You can increase the output voltage by reducing the air gap between the sensor and the gear teeth. Conversely, increasing the air gap will lower the voltage signal.