I need to use this vibration sensor for my project. I'm confused because of the measurement units. Out value of the sensor is in current 0-20mA, which corresponds to 0-25 mm/sec. Why is it being measured in velocity terms?

Please find the link to the datasheet here.

  • \$\begingroup\$ link to datasheet is where? \$\endgroup\$
    – brhans
    Oct 10, 2016 at 15:01
  • 1
    \$\begingroup\$ Here's why velocity is important. \$\endgroup\$
    – JRE
    Oct 10, 2016 at 15:05
  • \$\begingroup\$ Think about it this way: If your machine is sliding across the room at a constant speed, it isn't accelerating but it will soon move far enough to pull its own plug out of the wall. \$\endgroup\$
    – JRE
    Oct 10, 2016 at 15:06
  • \$\begingroup\$ That "datasheet" is actually the mounting instructions, and doesn't mention the units. \$\endgroup\$
    – JRE
    Oct 10, 2016 at 15:07
  • \$\begingroup\$ I don't see any info on the output in that document. Where did you get the info that it produces 0-20mA for 0-25mm/sec? I've never seen any vibration sensor specified in units of velocity rather than acceleration. \$\endgroup\$
    – brhans
    Oct 10, 2016 at 15:23

1 Answer 1


That's just a voice coil plus rectifier plus low-pass. So it cannot measure acceleration but only velocity.

  • \$\begingroup\$ Even if you're correct about that device using a voice-coil, how would that make it a velocity sensor instead of acceleration? \$\endgroup\$
    – brhans
    Oct 10, 2016 at 15:18
  • \$\begingroup\$ Electromagnetic Induction: U=v * L * B0. I don't see a here but v. \$\endgroup\$
    – Janka
    Oct 10, 2016 at 15:57
  • \$\begingroup\$ I seriously doubt it. Most industrial sensors like this have built in signal processing/conditioning. \$\endgroup\$
    – Drew
    Mar 22, 2022 at 0:18

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