AI-TEK 70085-1010-472 Speed Sensor 1/4-40 Thread 232°C

Description

AI-TEK 70085-1010-472 Variable Reluctance Speed Sensor

This AI-TEK 70085-1010-472 speed sensor detects rotational speed without external power. It uses variable reluctance technology for reliable performance. The sensor works in extreme temperatures from -73°C to 232°C. Its compact 1/4-40 threaded body fits tight industrial spaces.

Key Features & Benefits

• Wide temperature range: -73°C to 232°C suits ovens, turbines, and engines.
• Self-powered operation: No external supply needed for speed detection.
• High output voltage: Standard 4.7V P-P ensures clean signal to controllers.
• Low resistance: DC resistance max 125 ohms for consistent readings.
• Long lead & cable: 8-inch leads plus 60-inch cable simplify installation.

Technical Specifications (MECE Classified)

Brand & Model
– Brand: AI-TEK
– Part Number: 70085-1010-472
– Series: 70085 series variable reluctance sensor

Mechanical Dimensions & Thread
– Thread Size: 1/4-40 UNF
– Thread Length: 0.687 inch (17.45 mm)
– Total Sensor Length: 1.187 inch (30.15 mm)
– Net Weight: 2 oz maximum (approx 57 grams)

Electrical Output Characteristics
– Output Type: Variable reluctance (passive magnetic)
– Standard Output Voltage: 4.7 V (P-P)
– Guaranteed Minimum Output: 0.4 V (P-P)
– Output Polarity: White lead positive
– DC Resistance: 125 ohms max
– Typical Inductance: 5-12 mH reference

Environmental & Thermal Ratings
– Operating Temperature: -73°C to +232°C (-99°F to 450°F)
– Agency Approval: None (general industrial use)
– Housing Material: Stainless steel (standard for VR sensors)

Cabling & Termination
– Termination Type: Wires (flying leads)
– Lead Length: 8 inches (20.3 cm) from sensor body
– Cable Length (suffix -472): 60 inches (1.5 meters)
– Lead Material: Teflon insulated, high temp rated

Installation & Mechanical Compatibility

• Thread mounting: Use the 1/4-40 thread for direct mounting into a sensor port.
• Target material: Ferrous metal gear teeth or shaft keyways work best.
• Air gap setting: Typical gap 0.005″ to 0.015″ for strong signal.
• Torque recommendation: Hand tighten plus 1/4 turn with 7/16″ wrench.
• Lead dressing: Keep wires away from high voltage cables and heat sources.

Debugging, Maintenance & Diagnostics

• No output check: Measure DC resistance between leads (expect ≤125 ohms).
• Open coil test: Infinite resistance means damaged sensor coil.
• Output voltage test: Use oscilloscope while rotating a ferrous target past tip.
• Low voltage causes: Large air gap, slow target speed, or non-ferrous target.
• Maintenance: No routine maintenance needed; keep tip free of metal debris.

Typical Applications

• Gas turbine speed monitoring (power generation).
• Diesel engine RPM sensing for marine or industrial engines.
• Conveyor belt shaft speed detection in mining.
• Pump and compressor overspeed protection systems.
• Gear tooth counting in wind turbines and heavy machinery.

Compatibility & System Integration

• Works with any PLC or tachometer accepting passive VR inputs (0.4V min).
• Compatible with AI-TEK signal conditioners like 70085-9110 series.
• Direct replacement for obsolete 70085-1010-472 in industrial panels.
• No external power supply needed – simplifies retrofit projects.

Packaging, Warranty & Delivery

• Package includes: One AI-TEK 70085-1010-472 speed sensor, 8-inch leads, 60-inch extension cable, installation datasheet.
• Warranty: 12 months against manufacturing defects (normal use).
• Shipping carriers: FedEx, UPS, DHL available worldwide.
• Delivery time: 3-5 business days for stocked items.

Selection Guide & Buying Advice

• Choose the 70085-1010-472 for high temperature up to 232°C.
• Select shorter cable versions (-XXX) if sensor is close to your controller.
• For explosive atmospheres, look for AI-TEK hazardous location sensors (not this model).
• Check your target’s gear module: coarse pitch teeth generate stronger signals.
• Order spare sensors for critical machines to avoid unexpected downtime.

Frequently Asked Questions (Expert & Practical)

• Q: Does the 70085-1010-472 work with any PLC?
  A: Yes, it works with any PLC that has a high-speed counter or VR input accepting 0.4V minimum.
• Q: Why is the guaranteed output only 0.4V?
  A: That 0.4V is the minimum at the worst-case slow speed and large air gap. Normal output is 4.7V.
• Q: Can I extend the 60-inch cable further?
  A: Yes, use shielded twisted pair cable up to 300 feet. Keep away from AC power lines.
• Q: What happens if I reverse the white and black leads?
  A: The output polarity reverses, but signal amplitude remains same. Most systems ignore polarity.
• Q: Does temperature affect output voltage?
  A: High temperature lowers magnet strength slightly, but 70085-1010-472 maintains reliable signal up to 232°C.
• Q: My sensor has no output. How to troubleshoot?
  A: Measure DC resistance across leads. 125 ohms max = good coil. Above 500 ohms = replace sensor.
• Q: Is this sensor suitable for subsea applications?
  A: No, this model has no special sealing. Use epoxy-sealed version for underwater use.

Contact & Support

For technical support or bulk pricing, please contact us via WhatsApp: +86 158 8020 0923 (click to chat).

Compliance & Safety Notes

• This sensor has no agency approval – suitable for general industrial use.
• Installation must follow local electrical safety codes.
• Do not use in explosive gas environments without proper housing.
• The sensor meets RoHS requirements for lead-free manufacturing.

Note: Always verify the target material is ferrous (carbon steel). Non-ferrous targets like aluminum will not generate any output signal from this passive sensor.

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