Correction method for capacitive material level sensing device and anti-interference method for multiple capacitive material level sensing devices

Abstract

The invention discloses a correction method for a capacitive material level sensing device. The method is applied to measurement of a drum tank. The correction method comprises following steps: generating a measuring signal by a measuring signal generation circuit to measure the drum tank; transmitting a sensing signal to a control unit by a sensing circuit based on a measuring result measured by the measuring signal; determining whether the sensing signal is within the effective range by a control unit according to the sensing signal; setting a total capacitance value corresponding to the sensing signal by the control unit as measuring reference value if the control unit determines that the sensing signal is within the effective range; and controlling the measuring signal generation circuit by the control unit to adjust measuring frequency of the measuring signal if the control unit determines that the sensing signal is not within the effective range. The method is capable of automatically correcting the capacitive material level sensing device.

Description

Technical field [0001] The invention relates to a correction method of a material level sensing device and an anti-interference method of a plurality of material level sensing devices, in particular to a correction method of a capacitive material level sensing device and the prevention of multiple capacitive material level sensing devices Interference method. Background technique [0002] The principle of the capacitive level sensing device is: the material to be measured and the tank are regarded as an equivalent capacitance; when the sensing rod of the capacitive level sensing device is covered by the material, a capacitance value will be generated, making the circuit The signal is changed. However, many variables affect the accuracy of the capacitive level sensing device; therefore, after the capacitive level sensing device is installed, the user must manually adjust the capacitive level sensing device, which is very inconvenient. Moreover, when a plurality of capacitive lev...

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Problems solved by technology

[0004] Another object of the present invention is to provide an anti-interference method for a plurality of capacitive material level sensing devices, to solve the problem of mutual interference between multiple capacitive material level sensing devices, and improve the performance of capacitive material level sensing. device accuracy

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