working principle:
When the liquid flows in the pipeline, it seems to be a cutting magnetic line with a conductivity conductor. Beijing Xinrui Sitron Flow Meter produces various flow meters, including: electromagnetic flowmeter, turbine flowmeter, vortex flowmeter, float flowmeter, etc. , the signal is led to the circuit converter through the electrode. The transmitter outputs a weak AC signal, which contains various interference components, and the internal resistance of the signal changes up to tens of thousands of ohms. The converter is required to have a high input impedance and can suppress AC millivolts of various interference components. The converter, the electromagnetic flowmeter converts the induced electromotive force into a unified signal of 4 to 20 mADC for display, adjustment and control, and can also be sent to a computer for processing.
Precautions:
1. Since the induced signal voltage of the electromagnetic flowmeter is small, it is susceptible to noise. The reference potential must be the same as the liquid being measured. The correctness of the grounding of the electromagnetic flowmeter is directly related to the accuracy and stability of the measurement.
1 When the flow case is grounded, the measured liquid is electrically connected to the earth, at zero potential, so a symmetric potential signal of the same size but opposite polarity is induced on the two electrodes of the sensor; at the same time, the flowmeter case is grounded to provide shielding effect. To suppress electromagnetic interference from the outside and excitation systems.
2 When a strong stray current is attached to the pipe, stray current should be blocked from flowing through the flowmeter. When installing, first install an insulated short tube between the pipe and the flow meter, and then connect the two ends of the pipe with a copper wire with an area of ​​not less than 16 mm2. In this way, the current in the pipe is shunted from the copper wire and no longer passes through the flow meter, so the interference is reduced.
2. Selection of installation position of electromagnetic flowmeter 1 When there are elbows, valves and pumps on the upstream and downstream of the installation position of the electromagnetic flowmeter, the fluid forms a transverse secondary flow in the pipeline, and the flow velocity distribution deviates. When the length of the straight pipe section is insufficient, the measurement accuracy decreases. . Under normal circumstances, the length of the upstream straight pipe section is not less than 10D, and the length of the downstream straight pipe section is not less than 5D. When there is a pump or the like upstream, the length of the straight pipe is required to be not less than 30D. Do not install the meter on the inlet side of the pump. This will cause the tube to be vacuumed and cause errors in the measurement. Where D is the inner diameter of the pipe.
2 Make sure that the pipe is filled with liquid during the measurement, otherwise it will affect the measurement accuracy. When installing obliquely or vertically, the measured liquid flows from bottom to top. The liquid to be measured cannot contain too many bubbles.
3 Try to avoid strong vibration of the pipeline. If it is unavoidable, the sensor and the transmitter should be installed separately, and the pipeline should be fixed within 2~5D on the upper and lower sides of the flowmeter. Avoid damage to the transmitter due to strong vibrations.
4 There should be no large-scale motors and other equipment in the vicinity of the flowmeter, otherwise it will cause inductive interference and affect the measurement accuracy of the meter.
5 The injection of chemicals is prohibited on the upstream side of the flowmeter, so that the distribution of conductivity is extremely uneven, which causes serious interference to the measurement of the flowmeter.
6 When installing the flowmeter, the axis of the electrode should be approximately horizontal when installed horizontally. If the axis of the electrode is perpendicular to the ground, air bubbles are easily collected near the upper electrode to block the liquid from contacting it, and the electrode below is easily covered by dirt.
When the liquid flows in the pipeline, it seems to be a cutting magnetic line with a conductivity conductor. Beijing Xinrui Sitron Flow Meter produces various flow meters, including: electromagnetic flowmeter, turbine flowmeter, vortex flowmeter, float flowmeter, etc. , the signal is led to the circuit converter through the electrode. The transmitter outputs a weak AC signal, which contains various interference components, and the internal resistance of the signal changes up to tens of thousands of ohms. The converter is required to have a high input impedance and can suppress AC millivolts of various interference components. The converter, the electromagnetic flowmeter converts the induced electromotive force into a unified signal of 4 to 20 mADC for display, adjustment and control, and can also be sent to a computer for processing.
Precautions:
1. Since the induced signal voltage of the electromagnetic flowmeter is small, it is susceptible to noise. The reference potential must be the same as the liquid being measured. The correctness of the grounding of the electromagnetic flowmeter is directly related to the accuracy and stability of the measurement.
1 When the flow case is grounded, the measured liquid is electrically connected to the earth, at zero potential, so a symmetric potential signal of the same size but opposite polarity is induced on the two electrodes of the sensor; at the same time, the flowmeter case is grounded to provide shielding effect. To suppress electromagnetic interference from the outside and excitation systems.
2 When a strong stray current is attached to the pipe, stray current should be blocked from flowing through the flowmeter. When installing, first install an insulated short tube between the pipe and the flow meter, and then connect the two ends of the pipe with a copper wire with an area of ​​not less than 16 mm2. In this way, the current in the pipe is shunted from the copper wire and no longer passes through the flow meter, so the interference is reduced.
2. Selection of installation position of electromagnetic flowmeter 1 When there are elbows, valves and pumps on the upstream and downstream of the installation position of the electromagnetic flowmeter, the fluid forms a transverse secondary flow in the pipeline, and the flow velocity distribution deviates. When the length of the straight pipe section is insufficient, the measurement accuracy decreases. . Under normal circumstances, the length of the upstream straight pipe section is not less than 10D, and the length of the downstream straight pipe section is not less than 5D. When there is a pump or the like upstream, the length of the straight pipe is required to be not less than 30D. Do not install the meter on the inlet side of the pump. This will cause the tube to be vacuumed and cause errors in the measurement. Where D is the inner diameter of the pipe.
2 Make sure that the pipe is filled with liquid during the measurement, otherwise it will affect the measurement accuracy. When installing obliquely or vertically, the measured liquid flows from bottom to top. The liquid to be measured cannot contain too many bubbles.
3 Try to avoid strong vibration of the pipeline. If it is unavoidable, the sensor and the transmitter should be installed separately, and the pipeline should be fixed within 2~5D on the upper and lower sides of the flowmeter. Avoid damage to the transmitter due to strong vibrations.
4 There should be no large-scale motors and other equipment in the vicinity of the flowmeter, otherwise it will cause inductive interference and affect the measurement accuracy of the meter.
5 The injection of chemicals is prohibited on the upstream side of the flowmeter, so that the distribution of conductivity is extremely uneven, which causes serious interference to the measurement of the flowmeter.
6 When installing the flowmeter, the axis of the electrode should be approximately horizontal when installed horizontally. If the axis of the electrode is perpendicular to the ground, air bubbles are easily collected near the upper electrode to block the liquid from contacting it, and the electrode below is easily covered by dirt.
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