Radar level meter is an advanced measuring instrument for solid materials, process vessels or strong dust prone to crystallization and condensation. It has the advantages of low maintenance, high performance, high accuracy, high reliability and long service life. It can adapt to high temperature, high pressure, steam and other harsh production environments. The measuring distance can reach 70 meters and can be used for level measurement of storage tanks, intermediate buffer tanks or process vessels with 4...20mA analog signal output. During the use of radar level meter will be affected by many factors, which may affect the measurement accuracy.

Radar level meter current interference treatment is roughly divided into two categories, namely DC interference and AC interference.

1、DC interference

In the radar level measurement circuit, when additional DC current voltage appears, it is DC interference. In serious cases, it will make the measurement instrument can not work properly. The sources of DC interference are as follows:

(1) additional thermal potential.

(2) chemical potential.

(3) radar level meter and DC power contact, the leakage current will generate interference voltage through the measurement circuit.

2、AC interference

AC interference can also be divided into interline interference and interference to ground. Interline interference refers to the external influence, the radar level meter series (compensation wire) between the outputs will appear AC voltage. This interference is also known as lateral, common mode or common state interference. In general, the interline interference voltage can reach several millivolts or even tens of millivolts. Interference to ground is now one of the two outputs of the radar level meter (or compensation wire), its AC voltage to ground is called interference voltage to ground. This interference is also known as longitudinal, serial mode or serial state interference. In general, the interference voltage to ground can reach several volts or even more than 100 volts. The main sources of AC interference are the following:

(1) electromagnetic induction is the main source of interline interference.

(2) high-temperature leakage effects.

(3) high-voltage electric field interference.

(4) ground current interference.

(5) Suction mock leakage influence.

(6) Temperature measurement on the charged body can also introduce AC interference.

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