Model SPS16M

Magnetically coupled - Shaft Position Sender.


The sender is designed to smoothly report the position of a motor shaft to standard industrial control electronics using the very common 4 to 20 mA current loop. Fractional positions between “open” and “closed” result in a proportional output current between 4 and 20 mA. Overrun positions
outside the “open” and “closed” result in a fixed current of 4 or 20 mA, as appropriate. By careful design, this precision sender requires no batteries or external power supply since it draws its operating current from the signal loop. Calibration and the shaft position data are saved in non volatile memory. That is, generally when power is lost, information remains safe. Should power
be lost while the sender is rotating, information may be lost, requiring recalibration. However, for the usual application, as a door or window position indicator, loss of power while moving is a low risk, low error event. Two optional optocoupled inputs are provided for connection to 24 Volt AC/ DC limit switches, which greatly simplify and can even automate the calibration process. The current loop connections are not polarised facilitating the connection to unlabelled loop wires.

  • Manual or Automatic learning
  • Maximum shaft revolutions, including any overruns beyond “open” and “closed” is 4096
  • Resolution of a revolution is 16 positions
  • Maximum resolution of output is a approximately 250 steps of 0. 064 mA
  • Maximum shaft speed is 600 RPM
  • Coupling is 4 pole magnetic, through the sealed plastic enclosure
  • Maximum allowable loop voltage drop through sender at 4 mA is 28 VDC
  • Minimum dropout voltage through sender at 20 mA is 12 VDC
  • Loop Current is 4 to 20 mA ±0. 5 mA
* Specifications are subject to change without notice

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