Description
AI-TEK 70085-1010-227 Speed Sensor – Compact Magnetic Pickup for Harsh Environments
AI-TEK 70085-1010-227 is a passive magnetic speed sensor. It detects rotational speed without external power. This sensor works in extreme temperatures from -73°C up to 232°C. Ideal for turbines, engines, gearboxes, and industrial machinery.
Product Overview
The 70085-1010-227 features a 1/4-40 threaded body. Its compact length fits tight mounting spaces. The sensor generates a sine wave signal as ferrous targets pass the tip. You get reliable speed sensing even in oily or high-vibration environments.
Key Applications
- Gas turbine speed monitoring
- Diesel engine RPM sensing
- Gearbox shaft speed detection
- Conveyor roller speed feedback
- Pump and compressor overspeed protection
Technical Specifications (MECE Classified)
- ▪️ General Identification
- Brand: AI-TEK
- Model: 70085-1010-227
- Product Type: Passive variable reluctance speed sensor (Magnetic pickup)
- Series: 70085 series high temperature
- ▪️ Mechanical & Mounting
- Thread Size: 1/4-40 UNF
- Thread Length: 1.687 inches (42.85 mm)
- Total Sensor Length: 2.0 inches (50.8 mm)
- Termination: 8-inch wires (20.3 cm) + optional 60-inch cable (1.5 m)
- Net Weight: 2 oz maximum (≈57 grams)
- ▪️ Electrical Characteristics
- Output Polarity: White lead is positive
- DC Resistance: 125 ohms max
- Typical Inductance: 5 to 12 mH (reference)
- Standard Output Voltage: 4.7 V (P-P) at given condition
- Guaranteed Minimum Output: 0.4 V (P-P)
- No external power supply needed – passive design
- ▪️ Environmental & Thermal
- Operating Temperature: -73°C to +232°C (-99°F to 450°F)
- Temp Rating (Continuous): -73 to 232°C without derating
- Agency Approval: None (general industrial use)
- Environmental tolerance: High vibration, oil mist, wide thermal cycles
- ▪️ Performance & Signal Quality
- Output Waveform: Sine wave (AC), amplitude proportional to speed
- Typical Frequency Response: 10 Hz to 20 kHz (depends on target)
- Sensitivity: ~20 mV per mm/s (approx, target dependent)
- Linearity: Excellent for variable reluctance design within air gap range
- Recommended Air Gap: 0.005 to 0.015 inch (0.13–0.38 mm) for full output
- Immunity to electrical noise: Passive sensor has inherent EMI resistance
- ▪️ Diagnostics & Self-Check
- No active electronics → zero failure points from internal circuits
- Quick diagnostic: Measure DC resistance (should be ≤125 ohms)
- Turn shaft manually and read AC voltage with oscilloscope
- Open or short circuit in wiring indicates cable damage
Installation & Setup Guide
- Clean the 1/4-40 threaded hole before installation.
- Apply anti-seize compound to threads for high temperature use.
- Screw in 70085-1010-227 until it lightly contacts the gear tooth.
- Back off 1/4 to 1/2 turn to set proper air gap (0.005–0.015 in).
- Tighten lock nut to secure position without over-torque.
- Connect white lead to positive input of your speed monitor.
- Connect black lead to common/negative terminal.
- Use shielded cable for long runs to avoid electrical noise.
Compatibility & System Integration
- Works with any AC-coupled speed switch, tachometer, or PLC high-speed counter.
- Compatible with AI-TEK 70085-1010 series mounting adapters.
- Direct replacement for many 1/4-40 magnetic pickups from Honeywell, Dynalco.
- Signal conditioning required: most speed monitors include internal threshold.
- No configuration or software setup needed – purely analog output.
Maintenance & Serviceability
- Inspect tip for metal debris or wear every 6 months.
- Check wire insulation for cracks in high temperature zones.
- No calibration needed – passive design stable over life.
- Re-gap the sensor after removing and reinstalling.
- Clean threads and reapply anti-seize on each reinstallation.
Packaging & Delivery
- 70085-1010-227 sensor with 8-inch pigtail leads.
- Installation note card (quick reference).
- Anti-static protective bag.
- 12-month warranty against manufacturing defects.
- Shipping carriers: FedEx, UPS, DHL (express worldwide).
- Typical dispatch within 24 hours after order.
Selection Guide – How to Choose the Right AI-TEK Sensor
- Step 1: Thread size – verify you need 1/4-40 (standard for most turbine housings).
- Step 2: Temperature rating – choose 70085-1010-227 for -73°C to +232°C applications.
- Step 3: Length requirement – 2-inch body fits shallow ports; for deeper holes select longer models.
- Step 4: Output voltage – this model gives 4.7V P-P standard; ensure your monitor triggers above 0.4V min.
- Step 5: Cable lead option – standard 8 in leads; order extension if needed.
Frequently Asked Questions (FAQ)
- What is the minimum speed this sensor can detect?
Depends on target size and air gap. Typically 10 Hz (≈120 RPM for 60-tooth gear).
- Can I use the 70085-1010-227 in wet or condensing areas?
Yes, sensor is hermetically sealed. Avoid submerging the wire splice.
- Why does my output voltage read lower than 4.7V?
Air gap too large, target too small, or speed too low. Reduce gap to 0.010 inch.
- Does this sensor require a pull-up resistor?
No. It is a magnetic coil. Connect directly to AC input of a speed switch.
- What happens if I exceed 232°C?
Internal insulation may degrade, and output voltage drops permanently.
- How do I verify the sensor is working without a running machine?
Remove sensor, tap tip with a steel bar while measuring AC voltage. You will see pulses.
- Can I use this sensor with a PLC digital input?
Only with a signal conditioner that converts sine wave to square wave.
- Is the 70085-1010-227 intrinsically safe?
No agency approvals. But passive coil is inherently low energy (safe for general area).
Diagnostic & Troubleshooting Tips
- Symptom: No output signal – check DC resistance (should be ≤125Ω). Infinite = broken coil.
- Symptom: Weak signal at low speed – reduce air gap to 0.005 inch and increase target ferrous mass.
- Symptom: Intermittent signal – inspect wire for intermittent short due to vibration.
- Recommended tool – oscilloscope or portable datalogger to view waveform.
- Field quick check – use a multimeter with AC mV range while rotating shaft slowly.
Order & Shipping Information
- Price: Contact sales for current volume pricing.
- Lead time: In stock – ships within 1 business day.
- Express shipping: FedEx Priority, UPS Worldwide, DHL Express.
- Warranty: 12 months from date of shipment (material & workmanship).
- For inquiries or bulk quotes:
📞 +86 158 8020 0923 (WhatsApp) – click to chat.
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