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ONOSOKKI

MP-981 Electromagnetic Detector

The MP-981 is a compact, non-contact electromagnetic rotation detector designed for precise RPM measurement. It uses magneto-resistive sensing to detect changes in magnetic flux from gears, providing accurate readings from extremely low to high rotational speeds. This detector is ideal for automotive, industrial, and testing applications where durability, reliability, and wide-range performance are essential..

  • Detail
  • Special Features
  • Specification

The MP-981 works by detecting changes in magnetic flux caused by rotating gears, converting them into a rectangular waveform signal. Its magneto-resistive sensing elements, permanent magnet, built-in amplifier, and voltage regulator ensure stable and accurate signal generation.

This detector is highly versatile, capable of measuring speeds from near standstill to 20,000 r/min when used with a 60-tooth gear. It delivers reliable operation in harsh environments, with a wide temperature tolerance and resistance to vibration and shock. Built-in short-circuit and reverse polarity protection enhance operational safety.

Its compact size allows for easy installation, making it suitable for field measurements, industrial machinery monitoring, and laboratory testing.

  • Wide Detection Range – Measures from ultra-low speeds (around 1 Hz) to 20,000 r/min with a 60-tooth gear.

  • Non-Contact Measurement – Detects gear rotation without physical contact, minimizing wear and maintenance.

  • Self-Powered Signal Output – Generates frequency output without an external power source for the signal itself.

  • Rugged and Compact Design – Lightweight, durable housing suitable for challenging environments.

  • Multiple Variants Available – Offered in oil-proof, heat-resistant, compact, and extended-length models for different applications.

Specification Details
Detection Principle Magneto-resistive, non-contact magnetic flux detection
Speed Range Approx. 1 Hz to 20 kHz (1–20,000 r/min with 60 P/R gear)
Compatible Gear Module Module 0.5–3, tooth width ≥ 3 mm
Output Type Rectangular waveform, High ≈ 5 V, Low ≤ 0.5 V, Output impedance ≈ 330 Ω
Power Supply Requirement DC 12 V ± 2 V, ≤ 40 mA
Operating Temperature –10 °C to +70 °C
Storage Temperature –20 °C to +80 °C
Vibration Resistance 1.2 mm amplitude at 30 Hz (powered)
Shock Resistance 490 m/s² (unpowered)
Insulation Withstand Voltage DC 250 V for 1 minute between shield and sensor elements
Weight Approx. 80 g (including mounting nuts)
Variants Standard, oil-proof, heat-resistant, compact, and extended-body types
Cable Requirement Requires compatible signal cable (sold separately)