Electromagnetic Flowmeter

Product Overview:

The LD type electromagnetic flowmeter is a fully intelligent instrument developed based on Faraday's law of electromagnetic induction and advanced technology. Its all Chinese electromagnetic converter core uses a high-speed central processing unit, with fast computer speed, high accuracy, and reliable measurement performance. The stable magnetic field and special magnetic circuit structure make it highly resistant to external interference, and it is widely used in the measurement and control of conductive liquids in industries such as chemical, power, metallurgy, petroleum, sewage, medical, and food.

Product Features:

Measurement is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity;

Measure the flow components inside the tube, with no pressure loss and low requirements for straight pipe sections;

Series nominal diameter DN10~DN600. There are multiple options for sensor lining and electrode materials;

The converter adopts a novel excitation method, with low power consumption, stable zero point, and high accuracy. The flow range can reach 150:1;

The converter can be integrated or separated from the sensor;

The converter adopts a 16 bit high-performance microprocessor, 2X16LCD display, convenient parameter setting, and reliable programming;

The flowmeter is a bidirectional measurement system equipped with three integrators: forward total, reverse total, and differential total; It can display forward and reverse flow rates and has multiple outputs: current, pulse, digital communication HART；

The converter adopts surface mount technology (SMT) and has self checking and self diagnostic functions;

Rubber and polyurethane lined sensors are inherently immersive structures;

Explosion proof instruments can be used in corresponding explosion-proof places;

technical indicators

◆ Caliber

PTFE lining diameter: DN10 (F46) DN15 (F46) DN15~DN600

Rubber lining diameter: 40 50 65 80 100 125 150 200 250

300 350 400 500 600

◆ nominal pressure DN10~50 ≤ PN4.0MPa

DN65~150 ≤PN1.6MPa

DN200~600 ≤PN1.0MPa

◆ Environmental temperature sensor: -25 ℃~+60 ℃

Converter and integrated type: -10 ℃~+60 ℃

The ultimate high-temperature separation type integrated fluid

Polytetrafluoroethylene

rubber

F46

PFA

Flow direction: forward, reverse, and total difference

Flow measurement range: The corresponding flow rate of 0.3~1.5m/s is 0.0283~1520m ³/h

Range ratio: 150:1

Accuracy level: 1.0 level, 0.5 level

◆ Conductivity range: ≥ 5 μ s/cm (generally 200~800ms/cm)

◆ Electrode materials: 316L, Ti, tantalum (Ta), Hastelloy, platinum, coated tungsten carbide

Power supply: 85~265V, 45~63Hz

Pulse frequency: 0~1KHz, optically isolated OCT, external power supply ≤ 35V, conducting, and electrode maximum current of 25mA

Protection level: IP65, submersible type IP68

◆ Connection method: flange connection, using HG20592~2009 standard (carbon steel, stainless steel)

◆ Straight pipe section: Front straight pipe section ≥ 10D

Rear straight pipe section ≥ 5D

Total power consumption:<20W

flow range

Note: The flow rate of the flowmeter is within the range of 0.3~15m/s. At this time, the diameter of the flowmeter is selected to be * the user's diameter. When the flow rate is lower than 0.3m/s,Increase the flow rate at the front of the instrument before use.

Product Selection

Selection principles

The tested fluid must be a conductive liquid or slurry with a conductivity of not less than 5 μ s/cm. The tested fluid should not contain a large amount of ferromagnetic substances or bubbles. The appropriate pressure rating, lining material, electrode material, and instrument structure should be selected based on the characteristics of the tested fluid.

Selection of Path

1. Due to the high range of 150:1 of LD electromagnetic flowmeter, the instrument diameter is usually chosen to be the same as the process pipeline.

If the measured medium contains solid particles, the recommended flow velocity range is 1-3m/s. If the actual flow velocity is too high and cannot be changed, a larger instrument diameter can be selected

Reduce the fluid flow velocity in the measuring section of the flow meter by adjusting the diameter of the process pipeline to alleviate particle wear on the electrode and lining.

3. If there may be sediment in the process pipeline, it is recommended to have a flow rate of 2-5m/s. If the actual flow rate is too low and it is inconvenient to change the process pipeline, instruments can be selected

The diameter is smaller than the diameter of the process pipeline, and the fluid flow rate of the flowmeter should be appropriately increased to avoid the influence of sediment on the accuracy of the instrument.

4. In cases where the flow rate is too low and high-precision measurement is required, sensors smaller than the diameter of the process pipeline can be selected to increase the flow rate and ensure high accuracy.

In situations 2, 3, and 4 mentioned above, reducers must be installed upstream and downstream of the flowmeter. The center cone angle of the reducer should not exceed 15 °, and there should be at least 5 times the upstream cone angle of the reducer

The straight pipe section with the diameter of the process pipeline.

To assist in selection, the following table lists several representative flow rates corresponding to flow rates. The flow rate corresponding to any flow rate can also be quickly calculated using this table: if

Given the flow rate value Q (m ³/h), and then finding the corresponding flow rate value Q1 for a flow rate of 1m/s under the corresponding diameter from the table, the corresponding flow rate V=Q/Q1 (m/s).