Electromagnetic flowmeter installation considerations
The measurement principle of the electromagnetic flow meter does not depend on the characteristics of the flow rate. If there is a certain turbulence and eddy within the pipe in the non-measurement area, it has nothing to do with the measurement.
A. The installation site cannot have large vibration sources, and reinforcement measures should be taken to stabilize the pipeline near the instrument.
B, can not be installed in large transformers, motors, pumps and other equipment that generates a large magnetic field, so as to avoid electromagnetic interference;
C. When the sensor and pipe are connected, ensure that the pipe is fully operated and it is better to install it vertically;
D. The transmitter housing, shielded cable, measuring body, and both ends of the pipe must be grounded. The grounding electrode should be set separately. The grounding resistance should be less than 10 ohms, and it cannot be connected to the electrical or public grounding network.
E. It is required to have a straight pipe section with 5 times the pipe diameter after the first 5 times.
If there are steady-state eddy currents in the measurement area, it will affect the stability of the measurement and the accuracy of the measurement. At this time, the length of the straight pipe section can be increased, a flow stabilizer can be used or the cross section of the measurement point can be reduced to stabilize the flow velocity distribution.
The flowmeter can be installed both horizontally and vertically, but it should be ensured that the influence of deposits and air bubbles on the measuring electrode is avoided and the electrode axis is kept at a good level. When mounted vertically, the fluid should flow from bottom to top.
The sensor can not be installed in the highest position of the pipe, this position is easy to accumulate air bubbles.
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Make sure that the flow sensor is filled with the fluid under test during the measurement, and the non-full pipe state cannot occur.
If there is a non-full pipe in the pipeline or the outlet is empty, the sensor should be installed on a siphon pipe.
The conventional straight pipe section requirement of the electromagnetic flowmeter is 5D after the first 10D. There are different requirements in the case of an elbow and a valve.
Electromagnetic flowmeter grounding reasons:
The measuring electrode in the electromagnetic flowmeter is in a DC or AC electric field and if its environment cannot be effectively shielded in a non-interfering condition, there is serious interference with the measurement.
Whether the sensor housing is grounded or not is directly related to the accuracy and stability of the measurement. The grounding conductor must not transmit any interference voltage. Therefore, the electromagnetic flowmeter requires a very reliable grounding, and the grounding shield must be well done, otherwise it will generate interference current.
However, the advantages of electromagnetic flowmeter grounding: If the pipeline connected to the sewage flowmeter (relative to the measured medium) is insulated, a grounding ring is used, and its material should be selected according to the corrosivity of the measured medium.
If it is a PTFE sensor, in order to protect the PTFE flange from damage, use a grounding ring.
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