Examples of maintenance

Inspection of maintenance controller of electromagnetic flowmeter

Testing equipment: one 500m Ω insulation layer measuring instrument and one digital multimeter.

Converter inspection

If the nozzle flowmeter is judged to be a common fault of the converter, please contact the manufacturer and generally replace the PCB circuit board under normal conditions after checking the external causes

The practical activity of measuring low conductivity medium by electromagnetic flowmeter.

Electromagnetic flowmeter is used to measure the total volume flow of liquid medium with conductivity of more than 5 μ s / cm. The basic principle of electromagnetic flowmeter is mainly based on the basic law of magnetic effect of Faraday current, that is, when the hydrodynamics is based on the measuring tube, the laser cutting magnetic induction line is magnetically induced by the electromotive force. The electromotive force is proportional to the magnetic flux density. The nominal diameter of the measuring pipe is multiplied by the average water flow. The electromotive force (total flow data signal) is measured by the electric level and sent to the converter according to the cable. However, when measuring the weak conductivity medium, the electromotive force cannot be magnetically sensed. According to the practical operation steps on the spot, people summarize the following contents for reference only:

It is to make sure whether the measured medium has conductivity. The second is to install the intelligent flowmeter in strict accordance with the commodity manual. The third is to turn off the main parameter of empty pipe alarm in the converter of the electromagnetic flowmeter when the electromagnetic flowmeter is adjusted, and then the electromotive force can be tested successfully.

The measurement method of electromagnetic flowmeter caliber is clear: the key of intelligent vortex flowmeter is to measure the total volume flow of the liquid with conductivity in the closed pipeline. The electromagnetic flowmeter requires that the flow of small water in the fluid mechanics shall not be less than 0.5m/s, all of which are normal at 2-2m / s, and the flow of small water shall not be more than 2m / s. therefore, when selecting the caliber of electromagnetic flowmeter, we should take into account that the electromagnetic flow shall be ensured Under the measurement precision of the meter, select the appropriate pipeline specification, then how to determine the caliber of the electromagnetic flowmeter? Next, I will briefly introduce the caliber of electromagnetic flowmeter. How to determine the caliber of electromagnetic flowmeter? I assume that there is a 1000m3 pool of water which is required to be drained by centrifugal pump in 4 hours? How to determine the caliber of pipeline to be selected? According to the main parameters specified above, it can be clear that the total flow category of the steam flow meter is: 1000m3 divided by 4 hours, i.e. 125m3 / h. According to the total flow, the approximate scope of pipe diameter can be calculated, that is, π R 2 × water flow (0.5 ~ 2m / s) = 125m3 / h, According to the calculation, it is understood that the diameter of the water to be pumped is 0.075m ~ 0.2975m, i.e. DN80 ~ DN300, and then the precision of the electromagnetic flowmeter is fully considered. The water selection flow is 2 ~ 2m / s. according to the calculation, the diameter is 0.105m ~ 0.149m, i.e. DN100 ~ DN150, and the project investment and other factors are fully considered, so the DN100 can be selected properly.?