Description
AI-TEK 70085-1010-458 Speed Sensor
AI-TEK 70085-1010-458 is a high-performance passive speed sensor. It works in extreme temperatures from -73°C to +232°C. The sensor uses a 3/8-24 thread for easy installation. This model delivers a 24V peak-to-peak output signal. It suits gas turbines, compressors, and industrial engines.
Key Features at a Glance
- Brand: AI-TEK
- Model: 70085-1010-458
- Thread Size: 3/8-24 UNF
- Output Type: Passive variable reluctance
- Temperature Range: -73°C to +232°C
- Lead Length: 40 inches (1 meter)
Technical Specifications
- Thread Size: 3/8-24
- Thread Length: 3.625 inches
- Total Sensor Length: 4.065 inches
- Termination: Wire leads (40 inch length)
- Output Polarity: White lead positive
- Guaranteed Output Voltage: 2.0 V (P-P)
- Standard Output Voltage: 24 V (P-P)
- Typical Inductance: 21 mH (reference)
- DC Resistance: 125 ohms maximum
- Operating Temperature: -73°C to +232°C
- Net Weight: 2 ounces maximum
- Agency Approval: None (general industrial use)
Measurement & Signal Characteristics
- Speed Range: Zero to high frequency (passive design)
- Frequency Response: Dependent on gear tooth speed
- Sensitivity: 24V P-P at standard operating speed
- Guaranteed Trigger: 2.0V P-P minimum output
- Resolution: One pulse per ferrous target passing
- Linearity: Not applicable (digital pulse output)
Environmental & Mechanical Data
- Temperature Tolerance: -73°C to +232°C (no derating)
- Moisture Resistance: Sealed construction for harsh areas
- Vibration Resistance: Suitable for engine-mounted use
- EMI Immunity: Passive design, no external power needed
- Housing Material: Stainless steel body
- Mounting Thread: 3/8-24 UNF standard
Installation Guide
- Clean the mounting hole thoroughly before installation.
- Apply anti-seize compound on the 3/8-24 threads.
- Screw the sensor until it lightly touches the gear tooth.
- Back off the sensor by 1/2 to 3/4 turn for air gap.
- Tighten the lock nut to secure the sensor position.
- Route the 40-inch wire leads away from high voltage cables.
- Connect the white lead to signal positive terminal.
- Connect the black or shield lead to common/ground.
- Do not overtighten or damage the fine threads.
Compatibility & Usage
- Works with any PLC counter input module.
- Compatible with AI-TEK tachometers and speed switches.
- Direct replacement for many 70085 series sensors.
- Use with ferrous gear teeth (steel or iron).
- Ideal for speeds from 3 Hz to 20 kHz.
Typical Applications
- Gas turbine speed monitoring
- Compressor shaft speed feedback
- Diesel engine RPM measurement
- Pump overspeed protection systems
- Generator speed control loops
- Marine propulsion shaft monitoring
Diagnostic Capability
- Check DC resistance between leads (125 ohms typical).
- Open circuit indicates internal coil failure.
- Short circuit indicates damaged insulation.
- Measure output voltage while cranking the engine.
- You need at least 2.0V P-P for reliable counting.
- Low voltage means the air gap is too large.
- No signal means the target is non-ferrous or missing.
Package Contents
- 1 x AI-TEK 70085-1010-458 speed sensor
- 1 x factory calibration certificate (traceable)
- 1 x installation instruction sheet
- 2 x cable tie mounts for lead management
Warranty & Shipping
- 12 months warranty against manufacturing defects.
- Fast delivery via FedEx, UPS, or DHL worldwide.
- Tracking number provided within 24 hours of shipment.
Frequently Asked Questions (FAQ)
Q1: Can this sensor work at 250°C continuously?
Yes, the 70085-1010-458 operates up to 232°C. For 250°C, please check our high-temperature series.
Q2: What happens if I reverse the white and black wires?
The sensor still works, but output polarity reverses. Most counters accept either polarity.
Q3: What is the recommended air gap for reliable measurement?
Start with 0.5mm to 0.8mm gap. Adjust until you get clear pulses at low speed.
Q4: Does this sensor work with stainless steel gear teeth?
No, it requires ferrous material like carbon steel. Stainless steel gives weak or zero signal.
Q5: How do I know if my sensor is failing?
Measure DC resistance. Open or short circuit means failure. Output below 2V P-P also indicates problems.
Q6: Can I cut and extend the 40-inch lead wires?
Yes, use shielded twisted pair cable for extension. Keep total length under 100 feet.
Q7: Why does my reading drop at high speed?
The air gap may be too large. Reduce the gap to under 0.020 inches for high speed.
Selection Guide & Expert Advice
- For ambient above 150°C: Choose 70085-1010-458 with high temp leads.
- For underwater or oil immersion: Select our hermetically sealed version.
- For explosive gas areas: Add an intrinsic safety barrier between sensor and PLC.
- For very low speeds (below 30 RPM): Use an active sensor with zero-speed capability.
- For long cable runs over 300 feet: Use a signal conditioner to boost voltage.
Contact Information
For inquiries or technical support: +86 158 8020 0923 (WhatsApp)
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