Dynalco SWT-1000 Speed Switch/Transmitter - Manual (Page 10)

Operating Instructions SWT-1000 DYNALCO
SWT-1000.r2.0609 8
3.2 Machine factor
The machine factor establishes the relationship between sensor frequency (Hz) and corresponding
speed (RPM).
Machine Factor = Frequency
RPM
If the # gear teeth and RPM are known, use the following formula to calculate corresponding
frequency:
Signal Frequency (Hz) = (RPM) X (Teeth or Discontinuities)
60
Another way to calculate the machine factor is:
Machine Factor = (Teeth or Discontinuities)
60
Note: The above formulas are based on the gear or target turning at the same speed as the
machine being monitored, ie: no step up or step down gear ratios involved.