9907-164 Digital Microprocessor Controller Module

9907-164 the voltage sensing electronic circuit has such a high input impedance. The equivalent resistance of the liquid would have to be significantly higher than the value shown in this example or there would be no significant effect on the accuracy of the flow measurement. In fact, the only time fluid conductivity is magnetic flowmeter when the conductivity of the fluid can be ignored. These fluids include deionised water (e.g. steam boiler feedwater, ultrapure water for pharmaceutical and semiconductor manufacturing) and oil. Most water-based (aqueous) fluids work well with magnetic flowmeters.

The upstream straight pipe is required to be 5 diameters and the downstream straight pipe is required to be 3 diameters. In addition, the wide opening of the magnetic flow meter tube means that there is absolutely nothing to restrict the flow, resulting in extremely low permanent pressure loss. The lack of any obstruction within the fluid flow path means that the magnetic flow meter is very tolerant of solids within the fluid flow stream, making it ideally suited to the measurement of process fluids such as wastewater, slurry, wood pulp and foodstuffs, which can clog up other types of flow meters. In fact, for this reason, magnetic flowmeters are the primary flowmeter technology used in the wastewater, wood pulp and food processing industries.

9907-164 conductive liquids must reach a certain minimum value, but that is all. Some technicians are surprised that changes in the conductivity of the liquid have little or no effect on the accuracy of the flow measurement. This is not to say that a doubling of the liquid conductivity will result in a doubling of the induced voltage! The electromotive force is a function of physical dimensions, magnetic field strength and fluid velocity. In voltage measurement circuits, poorly conducting fluids have greater resistance than well conducting fluids, but this result is not significant due to the significantly higher input impedance of the detection circuit!