Interference factors in radar level gauge measurement

What are the sources of interference in the use of radar level gauges? 1. In the measurement process of radar level gauge, the common interference can be divided into two types: DC and AC interference. 1. DC interference In the measurement loop of the radar level gauge, when an additional DC voltage occurs, it is a DC interference. In severe cases, the measuring instrument will not work properly. There are several sources of DC interference: a Additional thermoelectric potential. b Chemical potential. c When the radar level gauge is in contact with the DC power supply, the leakage current will generate interference voltage through the measurement circuit. 2. AC interference AC interference can be divided into line-to-line interference and ground-to-ground interference. Inter-line interference means that under external influence, AC voltage will appear between the output ends of the radar level gauge (compensation wire). This interference is also known as lateral, common mode or common mode interference. In general, the interference voltage between lines can reach several millivolts or even tens of millivolts. The ground interference refers to one end of the two output terminals of the radar level gauge (or compensation wire), and its AC voltage to the ground is called the ground interference voltage. This interference is also known as longitudinal, series-mode or series-state interference. Under normal circumstances, the interference voltage to ground can reach several volts or even more than 100 volts. The main sources of AC interference are as follows: a Electromagnetic induction is the main source of line-to-line interference. b High temperature leakage effect. c High voltage electric field interference. d Ground current interference. e Suction mock leakage effect. f Performing temperature measurement on a charged body can also introduce AC interference.

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