Electromagnetic flowmeter in the purchase of points to note

Case introduction

　　Electromagnetic flowmeter as the measurement of conductive media, in industry, municipal, agricultural and other areas of application is very common, due to its simple principle, and reliable, the entire measuring tube without pressure loss and movable parts, only the dielectric constant can arrive at the requirements, is a very good flow measurement instrument. But in the process selection, electromagnetic flowmeter or have strict selection requirements, can not meet the selection requirements, measurement data will certainly tend to be larger or measurement.

　　First, the electromagnetic flowmeter in the selection of several requirements

　　1, the dielectric constant > 16μ / s, the higher the dielectric constant, the higher the measurement accuracy.

　　2, the installation of straight sections must fit * times after 5 times the distance from the pipe diameter.

　　3, the medium temperature shall not be higher than 160 ℃.

　　4, on the electromagnetic flowmeter rubber lining selection considerations are temperature, corrosion, wear resistance and other factors

　　5, on the electromagnetic flowmeter electrode selection consider corrosive, wear-resistant elements.

　　6, the installation of pipeline materials into metal and non-metallic pipeline, or conductive pipeline and non-conductive pipeline, electromagnetic flowmeter due to the limitations of the principle, will produce a large number of interfering currents in the coil cover, this interfering current must be imported through a good grounding, otherwise it will be in the electrodes constitute an interference, so that the measurement is not allowed, or not out of the data, or the data drift and so on, assuming that in the non-conductive pipeline application Please install a grounding ring or three electrodes or multi-electrode electromagnetic flowmeter, the grounding electrode must be well grounded.

　　7, electromagnetic flowmeter converter part of the current more intelligent, Jichuang science and technology of electromagnetic flowmeter basic configuration contains digital RS485Mod-BUS communication, in the data transmission as far as possible to collect digital signals, anti-interference performance is good, long-distance transmission.

　　8, electromagnetic flowmeter installed around the environment as far as possible principle of high-voltage electricity, high-power power equipment or inverter and other equipment, assuming that can not be avoided, the electromagnetic flowmeter shell must be a good grounding.