The VF2 TDR transmits low-intensity electromagnetic pulses of approximately one nano second width along a rigid or flexible conductor. These pulses move at the speed of light and when the pulses reach the surface of the product to be measured, the pulses are reflected back to the signal convertor.
The device then measures the time from when the pulse was transmitted to when it is received. This is then divided by two as this is the time equivalent to the distance from the reference point of the device to the surface of the product. The time value is then converted into an output current of 4 - 20mA.
The VF2 is fitted with new DPR advanced software for dynamic parasite rejection which automatically removes false signals and improves stability and accuracy of the measured signal.