What are the methods for judging the quality of electromagnetic flowmeter coils?

Case introduction

Electromagnetic flowmeter is a flow detection instrument widely used in the field of industrial automation. It is based on the Faraday electromagnetic induction principle and determines the flow rate by measuring the magnetic intensity and flow speed of conductive liquid or gas. The electromagnetic flowmeter consists of two parts: a sensor and a converter. The sensor includes components such as coils, electrodes, and linings. The coil is one of the key components of the electromagnetic flowmeter sensor and is responsible for generating magnetic fields and measuring electromotive force. Therefore, the quality of the coil is directly related to the level and stability of the electromagnetic flowmeter. However, during use, the electromagnetic flowmeter coil may be damaged due to various reasons. How to judge the quality of the coil has become one of the important skills that workers need to master.

The main causes of electromagnetic flowmeter coil damage include sudden interruption of coil power supply, overcurrent or excessive voltage, overheating, corrosion, etc. When the coil is damaged, the electromagnetic flowmeter will display abnormally or not work at all, so it is necessary to judge the quality of the coil in time.

The main methods to judge the quality of the electromagnetic flowmeter coil are as follows:

1. Check the coil for short circuit or open circuit: remove the electromagnetic flowmeter sensor and remove the junction box , use a multimeter to measure the resistance value between coils. Under normal circumstances, the resistance value of the coil should be a value within a certain range. If the resistance value is too low or zero, it means the coil is short-circuited or open-circuited.

2. Check the low resistance of the coil: Connect the coil with the wire that comes with the electromagnetic flowmeter, and then measure the resistance value of the coil. If the resistance value is low, it means there is a low resistance fault in the coil.

3. Check the high resistance of the coil: Also use the wire that comes with the electromagnetic flowmeter to connect the coil, and then measure the resistance value of the coil. If the resistance value is high, it means that the coil has a high resistance fault.

4. Measured electromagnetic flowmeter performance: Put the electromagnetic flowmeter sensor into a stable flow state, and use a multimeter to measure the electromotive force of the coil. If the electromotive force value is low or cannot be measured, the coil is damaged.

In addition, operators can also judge whether the coil is damaged by observing whether there are signs of cracks or deformation in the electromagnetic flowmeter sensor.

In summary, the electromagnetic flowmeter is a very practical flow detection instrument, but it also requires careful maintenance and judgment of the quality of the coil. Through the above simple and practical methods, the operator can easily judge the condition of the electromagnetic flowmeter coil, so as to repair the fault in time and ensure the normal and stable operation of the electromagnetic flowmeter.