Pipeline emission metering equipment electromagnetic flowmeter

Pipeline emission metering equipment electromagnetic flowmeter

Electromagnetic flowmeter is a new type of flow measurement instrument that rapidly developed with the development of electronic technology in the 1950s and 1960s. An electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow rate of a conductive fluid based on the induced electromotive force when the fluid passes through an external magnetic field.

The structure mainly consists of a magnetic circuit system, a measuring conduit, electrodes, a housing, a lining, and a converter.

Pipeline emission metering equipment electromagnetic flowmeter

Installation method:

Simply put, an electromagnetic flowmeter is composed of a flow sensor transmitter. The installation requirement of electromagnetic flowmeter is to be installed at the low end of the pipelineThe vertical section of the point or pipeline must be in full condition, and the requirement for the straight pipe section is the first 5D and then 3D, in order to ensure the use of the electromagnetic flowmeter and the accuracy requirements.

The measurement principle of electromagnetic flowmeter does not depend on the characteristics of flow rate. If there is a certain amount of turbulence and vortex generated in the non measurement area of the pipeline (such as bends, tangential flow restrictions, or partially open shut-off valves upstream), it is irrelevant to the measurement. If there is a steady-state eddy current in the measurement area, it will affect the stability and accuracy of the measurement. In this case, some measures should be taken to stabilize the flow velocity distribution:

1. Increase the length of the front and rear straight pipe sections

2. Adopt a traffic stabilizer

3. Reduce the cross-section of measurement points.

1. Requirements for the external environment

1．1．Flow meters should be avoided from being installed in places with large temperature changes or high temperature radiation from equipment. If installation is necessary, insulation and ventilation measures must be taken.

1．2．It is best to install flow meters indoors. If they must be installed outdoors, they should be protected from rainwater, waterlogging, and direct sunlight. Moisture and sun protection measures should be taken.

1．3．Flow meters should be avoided from being installed in environments containing corrosive gases, and ventilation measures must be taken when installation is necessary.

1．4．For the convenience of installation, maintenance, and upkeep, there should be ample installation space around the flowmeter.

1．5．The installation site of the flowmeter should avoid magnetic fields and strong vibration sources. If the pipeline vibration is large, there should be fixed pipe supports on both sides of the flowmeter.