Electromagnetic Flowmeter

Principle:

ZEFType electromagnetic flow sensor (referred to as sensor) is made according to Faraday's law of electromagnetic induction, which linearly converts the flow rate of the measured fluid in the pipeline into a voltage signal. It is paired with a ZEF type electromagnetic flow converter (referred to as the converter) to form a ZEF type electromagnetic flowmeter (referred to as the flowmeter), which is used to measure the volumetric flow rate of various conductive liquids or liquid-solid two-phase media.

The sensor is made using Faraday's law of electromagnetic induction. When a conductive liquid moves in the direction perpendicular to the magnetic field lines along the measuring tube in an alternating magnetic field, the conductive liquid cuts the magnetic field lines and generates an induced potential. A pair of electrodes are installed on the tube wall perpendicular to the axis of the measuring tube and the magnetic field lines to detect the generated induced potential. This induced potential is proportional to the flow rate, and measuring this induced potential can derive the flow rate through the sensor, as shown in Figure (1). This flow signal (induced potential) input converter is amplified and converted into a standard DC current signal proportional to the flow signal, with a frequency output of 0-10mA or (4-20) mA and O-10kHz, thereby achieving flow measurement.

Sensor features:

The sensor has no moving parts inside, simple structure, and reliable operation.

The measurement accuracy is not affected by changes in physical parameters such as temperature, pressure, viscosity, density (including liquid solidification) of the measured medium

Ring. As long as the conductivity of the measured medium is greater than 20 μ s/cm, the instrument indication is not affected by changes in conductivity.

The sensor is an integral sealed structure, with the measuring tube and housing integrated into one.

When the fluid passes through the sensor, there is almost no pressure loss, low energy consumption, and energy conservation.

The measurement range is large, and the maximum flow velocity inside the measuring tube can be set arbitrarily from 0.01 m/s to 10 m/s. The output signal is linearly related to the flow rate.

Due to the short size, light weight, low requirements for straight pipe sections before and after the sensor, and easy installation and use.

Due to the unique characteristics of sensors (flow meters) mentioned above, they have been widely used in the petrochemical and chemical industries

In the measurement and automatic control of conductive liquid flow in industrial and agricultural sectors such as fiber, metallurgy, fertilizer, papermaking, water supply and drainage, irrigation, and sewage treatment.

Form and composition of the product:

The form of the sensor is flange type, and the connection with the pipeline is flange connection.

The electrode materials inside the sensor and the lining materials of the measuring tube inside the sensor are as follows:

The electrode material consists of six types: molybdenum containing stainless steel 0crl8Nil2Mo, titanium Ti, Hastelloy B, Hastelloy C, tantalum, and special materials.

The lining material consists of chloroprene rubber, polyurethane and polytetrafluoroethylene, high-temperature resistant rubber F46、 Add PFA mesh.

Sensors suitable for different purposes are composed of different electrode materials and lining materials.

Technical parameters:

1Nominal Diameter(mm)

DN10-DN2000

2accuracy:

±0.2%、 ±O .5%

3measuring range(velocity of flow)：

O.01 m／sto10m／s

4Conductivity of the tested medium:

greater than20μs／cm

5nominal pressure(MPa)：

outside1 Sensor nominal pressure

Electrode material:

Molybdenum containing stainless steel0crl8Ni12Mo2TiTitaniumTiHastelloy alloyBHastelloy alloycTantalum and special materials.

Lining material:

Chloroprene rubber, polyurethane, polytetrafluoroethyleneF46.

Environmental temperature:

(-10～+50)℃

Sensor output signal:

O～2 .01mVp-p

Communication interface and current output:

RS485、RS232、4-20mA