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It is generally believed that the volume flow measured by the electromagnetic flowmeter is not affected by the viscosity and temperature of the liquid. However, the test proves that it will be affected. The conclusion of the following test example 1. The influence of liquid viscosity Modulated sugar, water solution, and glycerin, water solution is […]

When measuring fluids that are easy to adhere to and precipitate substances on the tube wall, if the attached is a conductive material with higher conductivity than the liquid, the signal potential may be short-circuited and cannot work. If it is a non-conductive layer, first pay attention to the contamination of the electrode. If the

If the drift gas contained in the liquid is only tiny bubbles, it can still work normally, but the measured volume flow of the mixture containing the volume of the bubbles; if the gas content increases to form a slug flow, the electrode may be covered by the gas and make the circuit disconnected instantaneously,

The corrosion resistance of the electrode is an important factor in the selection of materials, but sometimes the electrode material has good corrosion resistance to the measured medium, but it is not necessarily the applicable material, and the surface effect of the electrode should be avoided. The electrode surface effect is divided into three aspects:

The corrosion resistance of the EMF electrode is required to be very high, and corrosion is not allowed, or strictly speaking, only a very low corrosion rate is allowed, otherwise, the sealing between the electrode and the lining will be damaged. If the medium leaks, it can damage the insulation and the instrument cannot work

Poor installation Not full tube Gas storage in the piping system Constantly inhale gas Flow status changes during use 1. Poor installation Poor installation is manifested in: The flow sensor and the inner diameter of the connecting pipe are incorrectly matched, and the difference is too large. Without the manufacturer’s recommendation, the inner diameter of

1.The liquid contains gas The dissolved gas in the liquid will not affect the flow measurement, and the free gas (that is, air bubbles) will affect the measurement and may cause malfunctions. There are three sources of free gas in the liquid: ① the air in the pipeline is not exhausted; ② inhaled from outside

1. Strong magnetic field Since it is generally noted to be far away from the strong magnetic field during installation, there are not many cases where the strong magnetic field affects the practice. 2. Strong electromagnetic wave The electromagnetic flowmeter should meet the requirements of electromagnetic compatibility, work normally under the specified radiated electromagnetic field

Average velocity: m/s.  For the reference of the electromagnetic flow meter. Type of fluid Application occasions Type of pipe Average velocity Water General water supply Main pressure pipeline 1.5-3 Low-pressure pipeline 0.5-1 Pump inlet 0.5-2.0 Pump outlet 1.0-3.0 Industrial water Centrifugal pump pressure pipe DN250 0.5-2.0 Centrifugal pump suction pipe DN250 1.5-2.5 Reciprocating pump pressure

If the primary selection has been determined to adopt the electromagnetic flowmeter measurement method, the instrument selection becomes the specific electromagnetic flowmeter selection, and several factors in the five aspects of the appeal must be reconsidered. However, the focus of consideration has shifted from the selection of instrument varieties to the comparison and selection of