Sensitivity (0x80n1:16) and maximum travel path (0x80n1:18)

Sensitivity (index 0x80n1:16)

The measurement output signal of a sensor varies depending on the core displacement and the excitation voltage. Sensitivity is the ratio of these quantities and is expressed in:

Sensitivity [mV_output / V_supply / mm_{measuring path}]

The sensitivity is usually specified for the calibrated measuring range. Outside the measuring range linearity errors must be taken into account. Please refer to the information provided by the manufacturer.

Maximum travel path ("Overall sensor range", index 0x80n1:18)

An essential selection criterion for inductive measuring probes is the measuring path of the sensor. A distinction is made between:

• Measuring range:
  in this range the inductive measuring probe usually has a high linearity and accuracy. This range usually also corresponds to the measuring range calibrated by the manufacturer, for which the sensitivity is valid.
• Maximum mechanical travel path (overall sensor range):
  this is the maximum mechanical travel path or maximum mechanical stroke of the inductive measuring probe. This value is always greater than the calibrated measuring range.

The maximum mechanical travel path is specified via index 0x80n1:18 "Overall sensor range". The travel path must be entered symmetrically with "+/-" in the unit mm.

This information is required to set internal gain factors in such a way that a valid position value is still measured even at maximum travel path. If the value entered is too low, amplitude errors may occur in the limit range. These are displayed via the process data 0x60n0:04 "Input error".