Measurement of electrode resistance in electromagnetic flow meters

1. The concept and influence of electrode resistance in electromagnetic flowmeters. Electromagnetic flowmeters calculate the liquid flow rate by measuring the intensity of electromagnetic induction in the liquid. In electromagnetic flowmeters, electrode resistance refers to the contact resistance between the electrode and the liquid, which is one of the key factors affecting current signal transmission. If the electrode resistance is too large, it will cause signal attenuation, thus affecting the measurement accuracy; if the electrode resistance is too small, it will cause excessive current and burn out the electrode.

2. Measurement method of electrode resistance In order to ensure the accuracy and stability of the electromagnetic flowmeter, the electrode resistance should be tested regularly during installation and maintenance. Electrode resistance can be measured in a variety of ways. The following are two commonly used methods: 1. Using a multimeter to measure the resistance. First, the electromagnetic flowmeter needs to be powered off and the electrodes removed. Then, use a multimeter to measure the electrode resistance between two adjacent electrodes of the electromagnetic flowmeter. If the electrode resistance is too high, the electrode should be ground or replaced. If the electrode resistance is too small, the electrode plate should be replaced or the gap between adjacent electrodes should be adjusted to the normal range. 2. Using the 4-20mA signal measurement method. In this method, the electromagnetic flowmeter needs to be connected according to the energization mode, and then the electrode resistance value is measured through the 4-20mA signal.

This method can measure the electrode resistance of multiple electrodes at one time, and choose to replace or adjust the position of the electrode according to the size of the electrode resistance. In summary, the measurement of electrode resistance in electromagnetic flowmeters is very important to ensure measurement accuracy. When measuring electrode resistance, appropriate methods need to be adopted to repair or replace the electrodes in time to improve the stability and accuracy of the electromagnetic flowmeter. #electromagneticflowmeter#fametelectromagneticflowmeter