This manual provides installation, operation, and safety instructions for the Ono Sokki MP-981 magneto-type detector used for measuring RPM.
The Ono Sokki MP-981 is a magneto-type detector utilizing a Hall element to measure rotational speed from ultra-low to high speeds. It features a built-in signal indicator to verify operation and mounting position, ensuring accurate detection even in compact designs. The device is designed exclusively for RPM measurement using strong magnetic materials with specific gear modulus and tooth width requirements.
The manual details the mounting procedures, including the use of a mounting fixture for non-magnetic materials and precise positioning relative to the detection gear. It covers electrical connections, specifying a DC 12V +/- 2V power supply and explaining the connector pin arrangement. Safety precautions are emphasized, such as avoiding contact between the detector tip and the gear and ensuring proper power supply polarity. This manual is written in Japanese.
| Detection method | Hall element |
|---|---|
| Measurement range | 1Hz - 20kHz |
| Power supply | DC 12V +/- 2V |
| Current consumption | 40 nA or less |
| Output impedance | Approx. 330 Ohm |
| Operating temperature range | -10°C to +70°C |
| Storage temperature range | -20°C to +80°C |
| Mass | Approx. 80 g |
It should be mounted using the detector nut rather than cutting a thread into the object, or by using a mounting fixture for non-magnetic materials.
The output is a rectangular waveform with a duty cycle of approximately 50%.
Do not attach or remove sensors while rotating parts are moving, and avoid contacting the detector tip with the detection gear to prevent damage.