AI-TEK 70085-1010-424 Speed Sensor | 5/8-18 Thread

Description

AI-TEK 70085-1010-424 Speed Sensor

Thread Size 5/8-18 | High Output Voltage | Wide Temperature Range

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Product Overview

The AI-TEK 70085-1010-424 is a magnetic speed sensor. It works with gear tooth or target wheels. This device generates a reliable AC voltage signal. The output frequency matches the target speed. Industrial turbines, engines, and conveyors use it daily.

This model has a 5/8-18 thread and a compact body. Its connector termination allows quick installation. The sensor suits harsh environments with a -55 to 107°C temperature range. No external power is needed for operation. Just point it at a ferrous target and measure speed.

Technical Specifications

• Brand: AI-TEK
• Model Number: 70085-1010-424
• Series: Magnetic Pickup Speed Sensor
• Thread Size: 5/8-18 UNF
• Thread Length: 4.493 inches (114.1 mm)
• Total Sensor Length: 5.618 inches (142.7 mm)
• Output Voltage (Standard): 63 V (peak-to-peak)
• Guaranteed Output (P-P): 4.9 V at specific speed/air gap
• Output Polarity: Pin ‘B’ positive
• DC Resistance: 250 ohms maximum
• Typical Inductance: 63 mH reference
• Termination Style: Connector (no pigtail)
• Operating Temperature: -55 to +107 °C (-67 to +225 °F)
• Temperature Rating (Agency): -55 to 107 °C
• Net Weight: 5 ounces max. (approx. 142 g)
• Agency Approval: None (general industrial use)

Detailed Electrical & Mechanical Characteristics

• ▶ Output Signal Behavior
  • Standard output: 63 V P-P at rated speed
  • Guaranteed voltage: 4.9 V P-P at low speed / large gap
  • Frequency response: proportional to target speed
  • Zero speed detection: No (needs minimum frequency)
• ▶ Physical Construction
  • Housing material: stainless steel / high-strength alloy
  • Thread engagement: 5/8-18 with 4.493″ thread length
  • Connector type: industry standard 2-pin
  • Sealing: not immersion-rated; suitable for splash zones
• ▶ Environmental Resistance
  • Temperature range: -55°C to +107°C continuous
  • Vibration resistance: typical industrial (no specific rating)
  • Humidity tolerance: up to 95% non-condensing
  • EMI immunity: passive magnetic principle, naturally rugged

Installation Guidelines

• Clean the threaded hole before installation. Use a thread locker for high vibration areas.
• Screw the sensor until it lightly touches the gear tooth. Then back off 1/4 to 1/2 turn.
• Set the air gap between 0.020 to 0.040 inches for best output.
• Tighten the lock nut to 8-12 Nm torque. Do not overtighten.
• Connect the mating connector to pins A and B. Pin B gives positive polarity.
• Route the cable away from high voltage lines to avoid noise.
• The sensor needs a ferrous target (gear, sprocket, or shaft keyway).

Diagnostic & Maintenance Features

• Check output voltage with an oscilloscope. A clean sine wave means good target.
• DC resistance should read 250 ohms max across pins. Open circuit indicates coil failure.
• Low output at close gap suggests damaged magnet or wrong target material.
• No periodic cleaning needed. Just inspect connector for corrosion.
• You can replace the sensor without recalibration. Maintain original air gap.
• Works with most PLC counters and speed monitors directly.

Compatibility & System Integration

• Compatible with AI-TEK Tachometers and speed switches.
• Works with Allen-Bradley, Siemens, ABB, Honeywell high-speed counters.
• Direct replacement for obsolete models: 70085-1010-XXX series.
• Matching connector: use standard MS or Amphenol type (not included).
• Target material requirement: ferrous steel with 8 to 120 DP gear.
• Maximum surface speed: 10,000 feet per minute (typical).

Typical Applications

• Gas and steam turbine speed monitoring
• Diesel engine RPM measurement for generators
• Conveyor belt speed feedback in mining
• Pump and compressor overspeed protection
• Paper mill roller speed synchronization
• Wind turbine rotor speed sensing

Package Contents

• 1 x AI-TEK 70085-1010-424 Speed Sensor
• 1 x mating connector (if specified, standard order includes sensor only)
• Installation datasheet (quick reference)
• Calibration certificate not included – standard unit

Warranty & Shipping

• 12-month warranty against manufacturing defects. Does not cover physical damage or incorrect installation.
• Shipping carriers: FedEx, UPS, DHL express worldwide. Tracking number provided.
• Delivery time: 3-7 business days for stock items.

Certifications & Compliance

• Agency Approval: None (standard industrial sensor, not UL/ATEX rated)
• RoHS compliant: Yes, lead-free construction
• CE marking: Not required for passive magnetic devices
• Shock and vibration: meets typical NEMA MG1 standards

Frequently Asked Questions (FAQ)

• Q: What is the minimum detectable speed for this sensor?
  A: There is no fixed minimum. The sensor generates useful voltage above 10 Hz. Lower speed gives lower output. Use a high-oscilloscope to verify.
• Q: Can the 70085-1010-424 work underwater or in oil?
  A: No, this sensor has no IP rating for submersion. Use it in dry or splash environments only. For oil immersion, choose a sealed model.
• Q: My output voltage is lower than 63V P-P. Is the sensor defective?
  A: Not necessarily. The 63V is at ideal speed and air gap. At lower speed or larger gap, output drops. Check gap first.
• Q: How do I select between this model and other AI-TEK sensors?
  A: Choose the 70085-1010-424 if you need a 5/8-18 thread and connector termination. For longer thread or cable exit, consider 70085-1010-428 or 70085-1010-413.
• Q: Does this sensor need a pull-up resistor or external power?
  A: No, it’s a passive magnetic pickup. The coil generates its own AC voltage. Connect directly to a speed monitor with high impedance input.
• Q: How to extend the sensor cable?
  A: Use shielded twisted-pair cable. Keep total length under 300 meters. Solder or use terminal blocks. Avoid running near VFD cables.
• Q: What happens if the air gap is too large?
  A: Output voltage drops below the guaranteed 4.9V. The speed monitor may miss pulses. Set gap below 0.040 inches for reliable reading.

Selection Guide & Expert Tips

• Thread length: 4.493 inches suits thick housings. For thin walls, choose shorter thread version.
• Termination type: Connector type allows easy replacement without rewiring. Pigtail models cost less but require junction box.
• Output voltage: High 63V P-P works with most PLCs. If your card accepts only 5-30V, add a signal conditioner.
• Temperature extremes: -55°C to +107°C covers most outdoor & engine rooms. For cryogenic applications, use special model.
• Gear tooth material: Use carbon steel or cast iron. Stainless steel (non-magnetic) will not work.
• Experience tip: When replacing old sensors, always check the existing air gap. Mismatch causes intermittent speed loss.