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 […]
Adhesion and precipitation Read More »
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,
Electromagnetic flowmeter Contains drift gas Read More »
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:
Avoid electrode surface effects Read More »
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
Electrode selection of corrosion-resistant materials Read More »
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
electromagnetic flowmeters failure from the fluid side Read More »
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
electromagnetic flow meter failure caused by environment Read More »
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
Commonly used flow velocity in the pipeline Read More »
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
Considerations for electromagnetic flowmeter selection Read More »
Because of its simple structure, reliable performance, intuitive reading, small and constant pressure loss, approximate linear scale, wide measurement range, convenient maintenance, and low price, the float flowmeter is widely used in flow measurement and control occasions such as liquids and gases. In the application of various types of flow meters in China, it has
Overview of Float Flowmeter Read More »
