| Extremely short microwave pulses with low emitted power are transmitted by the antenna system to the measured product, reflected by the product surface and received by the antenna system. Radar waves travel at the speed of light. The time from emission to reception of the signals is proportional to the level in the vessel. A special time stretching procedure ensures reliable and precise measurement of the extremely short periods. The latest microcomputer technology and the proven software ECHOFOX select the level echo from among any number of false echoes and measure it precisely. By simply entering the vessel dimensions, a level-proportional signal can be generated. The product level must not be varied during adjustment. Unaffected by temperature and pressure The propagation of microwaves is practically unaffected by the ambient temperature and pressure. Hence these radar sensors are ideal for use under extremely difficult process conditions. Pressures from vacuum up to 160 bar (2320 psi) and temperatures from -40 ... +400°C (-40 ... +752°F) are no problem for radar measurement. |