Electromagnetic flowmeter is the ideal state is medium to full pipe and fluid continues to flow, don't stop or stop, but as the work of various field, there are also many cases just need to measure discontinuity, so electromagnetic flowmeter must be intermittent measurements.
Electromagnetic flow meter
in the measurement, due to the flow of the fluid, not easy to produce sediment, but it is hard to avoid after the stop stop not dirt and other material in the electrode and the instrument lumen deposit, according to the experience we know that once put into use and through a long period of time does not work, tend to be a failure, so they need to stop the condition of electromagnetic flowmeter is a correct and reasonable maintenance, to extend the service life of instrument and meter, improve the measurement accuracy, this paper is that on the one hand, the contents of the discussion with you.
Electromagnetic flowmeter zero check and adjustment of electromagnetic flowmeter in operation before, after electrify electromagnetic flow sensor must be filled with liquid under stationary state adjust the zero point.
After put into operation or to use condition periodically stop flow for zero check;
Especially on precipitation, easy pollution electrode, the cleaning liquid containing solid phase, at the beginning of the run should be checked, in order to obtain experience to determine the normal inspection cycle.
Ac excitation mode of electromagnetic flowmeter with rectangular wave excitation, are more likely to produce zero drift, so more attention should be paid to check and adjust.
Two sedimentary malfunction application example of the error.
One is drilling cementing engineering, the total flow perfusion slurry is an important process parameters, often with high-pressure electromagnetic flowmeter.
Instrument intermittent use, with finish to wash after sensor tube, the rest of the time are hollow tubes.
Due to inadequate cleaning, measuring residue slurry solidifying into a thin layer of tube wall, nearly two months accumulation form the insulating layer, covering the entire electrode surface, leading to run is not normal to not work.
Another is electrolytic cutting process on the test rig, saturated salt water flow is controlled by electromagnetic flowmeter, clearance after using a period found that traffic signal gradually weakened, 2 months after the signal is zero.
Reason is electrolytic iron deposition in the process of cutting tube wall, formation caused by short circuit.
Clear stratification is back to normal immediately.
Electromagnetic flowmeter check sensor performance * first, roughly measure resistance between electrodes.
Disconnect between the converter and signal connection of sensor and sensor inside fluid-filled, to the two electrodes and grounding resistance value is measured with a multimeter, e. range is in the factory, and measured by two values the same.
Record the * time measured resistance value, after this value to judge the sensor failure reason (
If sediment is conducting or insulating)
Secondly, sensor emptying liquid, wipe the lining, after being completely dry megohm meter was used to measure the resistance between the two electrodes and earthing terminal.
, check the excitation winding insulation resistance, sensor excitation coil, terminal and converter indirectly line by megohmmeter measuring insulation resistance of the coil.
In this paper, published by the embellish of instrument science and technology co. , LTD. )
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