Pipeline electromagnetic flowmeter, electromagnetic induction principle

Pipeline electromagnetic flowmeter, electromagnetic induction principleApplication field

The LY-LDE-B pipeline electromagnetic flowmeter can not only meet on-site display requirements, but also output 4-20mA current signals for recording, regulation, and control. It has been widely used in industrial technology and management departments such as chemical, environmental protection, metallurgy, medicine, papermaking, and water supply and drainage.

Pipeline electromagnetic flowmeter, electromagnetic induction principlePerformance Characteristics

The instrument structure is simple, reliable, without moving parts, and has a long working life.

There are no flow blocking components, and there is no pressure loss or fluid blockage.

◆ No mechanical inertia, fast response, good stability, can be applied to automatic detection, adjustment, and program control systems.

The measurement accuracy is not affected by the type of measured medium and its physical parameters such as temperature, viscosity, density, pressure, etc.

◆ Different combinations of PTFE or rubber lining and electrode materials such as Hc, Hb, 316L, Ti can adapt to the needs of different media.

Pipeline electromagnetic flowmeter, electromagnetic induction principleTechnical Specifications

Instrument accuracy: pipeline type 0.5 level, 1.0 level; Insertion type 2.5 level

Measurement medium: conductivity greater than 5 μ mS/Various liquid and liquid-solid two-phase fluids with a diameter of cm.

Flow velocity range: 0.2-8m/s

Work pressure: 1.6MPa

◆ Environmental temperature: -40 ℃ to+50 ℃

◆ Medium temperature: PTFE lining ≤ 180 ℃

Rubber material lining ≤ 65 ℃

Explosion proof mark: Exmibd Ⅱ BT4

Explosion proof certificate number: GYB01349

External magnetic interference: ≤ 400A/m

◆ Shell protection: Integrated type: IP65;

Detached type: Sensor IP68 (5 meters underwater,Rubber lining)

Converter IP65

Output signal: 4-20mA.DC, load resistance 0-750 Ω

Communication output: RS485 or CAN bus

Pipeline electromagnetic flowmeter, electromagnetic induction principleInstrument selection

Range confirmation

The flow rate of the medium measured by the general industrial electromagnetic flowmeter should be 2-4m/s. In special circumstances, the minimum flow rate should not be less than 0.2m/s, and the maximum flow rate should not be greater than 8m/s. If the medium contains solid particles, the commonly used flow rate should be less than 3m/s to prevent excessive friction between the lining and the electrode; For viscous fluids, the flow velocity can be chosen to be greater than 2m/s. A higher flow velocity helps to automatically eliminate the effect of viscous substances attached to the electrode, which is beneficial for improving measurement accuracy.

Under the condition that the range Q has been determined, the size of the flowmeter diameter D can be determined based on the range of flow velocity V mentioned above, and its value can be calculated by the following formula:

Q=πD2V/4

Q: Flow rate (㎡/h) D: Inner diameter of pipeline V: Flow rate (m/h)

The range Q of the electromagnetic flowmeter should be greater than the expected maximum flow value, while the normal flow value should be slightly greater than 50% of the flowmeter's full range scale.

Reference flow range