Industry new

Preparation and commissioning of electromagnetic flowmeter before operation

Before the electromagnetic flowmeter is put into operation, the sensor must be filled with the actual measurement medium, and the zero point adjustment is made in the static state after the power is turned on. After putting into operation, it is also necessary to stop the zero point according to the medium and the premise of the use of the medium, especially for the easy accumulation, easy to pollute the electrode, non-clean medium containing solids, in the initial stage of operation should be more reflective, in order to get a resume, affirmation of normal reflection cycle.

For users with preconditions, several fundamental parameters of the sensor should be measured and recorded before the instrument is put into operation.

1 electrode insulation resistance (when the sensor is empty, the two resistors are against the instrument case or ground insulation resistance);

2 the insulation resistance of the excitation coil (the insulation resistance of the excitation coil to the instrument case or ground);

3 the cold resistance value of the excitation coil (ie the copper resistance value of the excitation coil enameled wire);

4 electrode snoring resistance The sensor is filled with liquid, measuring the resistance between the electrode and the ground, the resistance of the two electrodes should be the same.

These data are very sponsored for the reason that the sensor has failed after running for a period of time. For example, when the resistance of the two electrodes changes, the electrode is likely to be stained; the resistance of the squeezing resistor becomes large, and the smear may be an insulating deposit; the snaking resistance becomes smaller, and the smear may be conductive. Sediment; two-electrode snoring resistance nickname, the level of contamination of the two electrodes is different; the insulation resistance of the electrode and the excitation coil drops the level of the sensor moisture; when the insulation resistance drops to a certain level, it will affect the normality of the instrument. thing. The cold resistance value of the excitation coil is a parameter that guarantees the normality of the excitation coil.

PREVIOUS：Difference between vortex flowmeter and turbiNEXT：Note on the laying of the electromagnetic flo