TL401D series Non-contact displacement sensors using eddy current technology measure distances, displacements, or positions of any electrically-conductive target.These objects may have both ferromagnetic and non-ferromagnetic properties. Due to the high insensitivity to oil, dirt, dust, moisture, interference fields, etc. the eddy current principle is eminently suitable for applications in harsh industrial environments.TL401D series power supply:20mA/-24VDC，Frequency Range: DC to 5kHz;