AI-TEK 70085-1010-421 Speed Sensor – 5/8-18 Magnetic Pickup

Description

AI-TEK 70085-1010-421 Speed Sensor – Magnetic Pickup for Heavy-Duty Sensing

Product Overview

This AI-TEK 70085-1010-421 speed sensor delivers reliable speed detection. It uses passive magnetic pickup technology. The sensor works without external power. It suits gas turbines, engines, and rotating machinery. AI-TEK builds this sensor for harsh industrial environments. The 70085-1010-421 provides a strong output signal. You can trust it for accurate overspeed detection and speed monitoring.

Technical Specifications

• Brand & Series: AI-TEK , Series 70085
• Model: 70085-1010-421
• Product Type: Passive magnetic speed sensor (variable reluctance)
• Thread Size: 5/8-18 UNF
• Thread Length: 2.475 inches (62.9 mm)
• Total Sensor Length: 3.6 inches (91.4 mm)
• Termination Style: Connector (not integral cable)
• Output Voltage (Standard): 63 V peak-to-peak (P-P)
• Guaranteed Output Voltage (P-P): 4.9 V at specified point
• DC Resistance: 250 ohms maximum
• Typical Inductance: 63 mH reference
• Output Polarity: Pin ‘B’ positive
• Operating Temperature Range: -55°C to +107°C (-67°F to +225°F)
• Temperature Rating (Agency): -55 to 107°C
• Net Weight: 5 ounces (142 g) max
• Agency Approvals: None (general industrial use)

Detailed Performance & Environmental Data

• Measurement Principle: Variable reluctance (passive magnetic)
• Frequency Response (typical): 0 to 20 kHz, depending on gear speed
• Sensitivity (typical): 60 mV per 1 kHz (reference)
• Linearity: Excellent near zero crossing; analog output proportional to speed
• Resolution: Detects each gear tooth or target passing
• Temperature Range (full operation): -55 to +107°C without degradation
• Environmental Tolerance: Resists oil, moisture, dust, and vibration
• Electromagnetic Interference (EMI): No active electronics – naturally immune
• Vibration resistance: Suitable for engine and turbine mounting
• Shock resistance: Withstands heavy industrial transients

Installation Guide

• Thread preparation: Clean the 5/8-18 mounting hole thoroughly.
• Installation depth: Screw sensor until it touches the gear tooth.
• Back-off adjustment: Turn back 1/2 to 3/4 turn for proper air gap.
• Torque recommendation: Tighten jam nut to 20-25 N·m (15-18 lb-ft).
• Connector mating: Use matching connector (not included).
• Wire polarity: Connect Pin ‘B’ positive to signal high input.
• Shielding: Use shielded twisted-pair cable for long runs.

Diagnostic Capability & Maintenance

• Self-diagnosis: Output voltage indicates air gap and target condition.
• Easy check: Measure AC voltage between pins while rotating shaft.
• No calibration needed: Passive sensor works immediately after installation.
• Maintenance tip: Periodically inspect connector for corrosion or looseness.
• Visual inspection: Check tip wear if sensor touches rotating parts.
• Low upkeep: No internal power or electronics to fail.

Typical Applications

• Gas turbine speed monitoring (power generation)
• Diesel engine overspeed protection (marine and land)
• Compressor shaft speed detection (oil & gas)
• Pump speed feedback (water/wastewater)
• Conveyor belt speed sensing (mining & aggregates)
• Gearbox RPM measurement (wind turbines, industrial drives)

Compatibility Information

• Compatible controllers: PLCs, overspeed protection relays, tachometers.
• Signal conditioner needed? No, connects directly to most speed monitors.
• Target material: Ferrous metal gear teeth, keyways, or holes.
• Gear module range: Works with DP 8 to DP 24 (metric 1.0 to 3.0 mod).
• Air gap recommendation: 0.3 to 1.0 mm (0.012 to 0.040 inch).

Order Package Contents (No certificate or warranty note)

• 1 x AI-TEK 70085-1010-421 speed sensor
• 1 x hex jam nut (5/8-18 thread)
• 1 x protective cap for connector during shipping
• Quick installation guide (printed)

Shipping & Delivery Methods

• FedEx Priority – 3 to 5 business days
• UPS Worldwide Saver – 3 to 4 business days
• DHL Express Worldwide – 2 to 4 business days
• Tracking number provided after dispatch.

Frequently Asked Questions (FAQ) & Selection Guide

• Q1: What minimum gear tooth speed does this sensor detect?
• At very low speed (1 Hz), output voltage drops below 1V P-P. Use active sensor for near-zero speed.
• Q2: Can I replace a 70085-1010-421 with other AI-TEK models?
• Yes, verify thread 5/8-18 and length. Longer thread versions (e.g., 70085-1010-XXX) may require adapters.
• Q3: Why do I only see 4.9V guaranteed output?
• That is the minimum guaranteed voltage at a specific air gap and speed. Real output can be much higher (63V P-P).
• Q4: Does it work with stainless steel gear?
• No – requires ferrous metal (carbon steel) target for magnetic field change.
• Q5: How to avoid false pulses from electrical noise?
• Use shielded twisted-pair cable, ground shield at controller end only. Keep sensor cable away from VFD cables.
• Experience-based tip: Sensor output too low?
• Reduce air gap by turning sensor closer to gear. Maximum gap 1.0 mm for reliable triggering.
• Selection guide: When to choose 70085-1010-421?
• Choose this model for high temp (-55 to 107°C) and strong output (63V). For < 80°C, standard sensors work but output lower.
• Selection guide: Thread length considerations
• 2.475 inch thread fits most housing walls up to 1.5 inch thick. For thicker walls, order longer thread version.

Contact Information Inquiries

For bulk orders or technical support, connect via WhatsApp: +86 158 8020 0923

Certifications & Standards Compliance

• Agency approval: None (not required for general industrial speed sensors)
• Quality system: Manufactured under ISO 9001:2015 certified facility.
• RoHS compliance: Lead-free construction.
• CE mark: Not applicable (passive device).

Warranty & Reliability Commitment

• Warranty period: 12 months from shipment date against manufacturing defects.
• What warranty covers: Defective materials, workmanship, or premature failure under normal use.
• Our guarantee: Quick replacement or repair within warranty period.

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