The FIBERTRAC 31 is a radiation-based sensor that is ideal for the continual measurement of various liquids and bulk solids. This equipment is suitable for level and interface measurement under drastic process conditions in antagonistic products or critical product features. The FIBERTRAC 31 supplies accurate calculating results even under the most severe operating conditions. It has several noteworthy advantages including cost-efficiency by the utilization of a single sensor up to 7 m measuring range, greatly enhanced plant availability via non-contact measurement in addition to effortless and straightforward mounting on circular and conical vessels by the use of a versatile detector.