Installation of electromagnetic flow meter
It is important to ensure the accuracy of the electromagnetic flow meter.
In order to ensure that the transmitter measuring tube filled with the measured medium, the best vertical installation, flow from bottom to bottom, especially for liquid and solid two-phase flow, must be vertical. If the site only allows horizontal installation, it must ensure that the two electrodes in the same horizontal plane
The transmitter should be installed in the indoor dry and ventilated place, avoid the installation in the environment temperature is too high, should not be strong vibration, as far as possible to avoid strong magnetic field equipment, such as large motor, transformer and so on.
Measured by the electromagnetic flow transducer electrode of a few millivolts AC voltage is to document.write ('') transmitter document.write ('') liquids the potential for foundation. In order to make liquid stable potential and transmitter and maintaining a fluid potential, in order to ensure stable are measured, the transmitter shell and the metal pipe ends should be well grounded, the converter shell should be grounded. Grounding resistance cannot be greater than 10, and other electrical equipment connected a common ground wire. If the transmitter housing is not guaranteed to be in good contact with the metal pipe, the metal conductors are used to connect them.
The transmitter should be installed at both ends of the valve and bypass.
Fifthly, in order to avoid signal interference and document.write ('') transmitter document.write ('') and a converter between the signal must be shielded wire transmission is not permitted. The signal cables and power lines parallel placed in the same cable pipe. Signal cable length shall not be more than 30 m.
The converter in installation site of avoiding, DC magnetic field and vibration, ambient temperature of - 20 to 50 DEG C, does not contain corrosive gases, relative humidity is less than 80%.
Seventhly, in order to avoid the velocity relative measurement, the flow control valve should be set in the downstream of the transmitter. For small caliber document.write ('') transmitter document.write (''), because the distance from the center electrode to the flow meter inlet has equivalent to several times the diameter D of length, so the upstream pipe can not. But to a larger diameter flowmeter, general upstream above should be 5D straight section downstream generally do not straight sections requirements
