China Magnetic Flow Meter for Sludge Slurry with 4-20mA RS485

Application

The DGS-006 series liquid flow meter or electromagnetic flow meter is designed specifically for the flow measurement of large-wear fluid, such as Sludge / Slurry, coal slurry, paper pulp, coal water pulp, corn pulp, fiber pulp, grain pulp, lime milk and so on. The structural features of the sensor and the special performance of the converter fully meet the requirements of the flow measurement of the plup.

Difficulties in the composition and measurement of Sludge / Slurry

1.The Sludge / Slurry contains a large amount of solid particles and friction electrode, resulting in 'spike pulse interference', which causes great fluctuations in the measurement of the flowmeter..

2.Flow fluctuation caused by the pulsation of the pressure pump (such as the screw pump, diaphragm pump and piston pump);

3.The metal particles in the slurry are magnetized and adsorbed on the electrodes or in the vicinity of the electrodes, causing fluctuations in the display and output of the liquid flow meter;

4.The serious wear of the slurry to the lining and electrode of the electromagnetic flow meter or liquid flow meter is also a difficult point for the designers.

Factors that cause fluctuations in the flow of coal-water slurry

Applicability

Solution

Other solutions

When the solid particles of the coal slurry are rubbed through the surface of the electrode, the contact electrochemical potential of theelectrode surface suddenly changes, resulting in the "spike pulse interference" of the electrode detected by the sensor output.

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The sensors withspecial materials and structure and special transducers.

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The pulsation caused by the pulsating flow of the 'screw pump' at different speeds

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The true fluctuation of flow, the flow meter can't solve.

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Lengthening the front straight sectionof the flowmeter is the best way to solve the pulsation caused by the work ofthe coal slurry pressurization pump.

Pulsating flow (6%~15%) caused by a 'piston pump' or'diaphragm pump'

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The magnetized metal particles are adsorbed on or near the measuring electrode, forming a polarization voltage on the electrode,reducing the measurement accuracy of the electromagnetic flowmeter and further increasing the amount of fluctuation.

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After dischargepressure, take out the electrode (removable electrode), clean it and installit again.

Reducing the metal particles in the coal slurry.

Distinctive advantages of the liquid flow meter:

1-No pressure loss, the measurement is not affected by temperature,pressure and other changes;

2-It is very convenient to replace the electrode of the flow meter without cutting the flowmeter shell;

3-Anti-scour lining protection ring designed with flow meter inlet;

4-Wear-resistant tungsten carbide electrode;

5-Ceramic lining,especially wear-resistant;

6-Anti-'Spray spike interference' algorithm and using 75Hz high frequency switching excitation method,the flow measurement is stable and the fluctuation is very small;

7-The signal-to-noise of the output signal of the sensor electrode is more than 3 times higher than that of the conventional flowmeter;

8-Excellent low velocity performance for the liquid flow meter;

9-Both the power supply and the output circuit adopt reliable lightning protection and surge protection, with high reliability and low fault;

10-Reliable detection technology of empty pipe.

Performance parameters

Precision of liquid flow meter:

Flow rate range

liquid flow meter

1.0m/s to 5m/s

0.25% of rate

0.3m/s to 1.0m/s

0.5% of rate

<0.3m/s

±0.015m/s

Repeatability: ±0.1% of measured value;

Response time: the maximum 0.3 milliseconds relative to the input change;

Stability: the stability over 6 months is ±0.1% of measured value;

Impact of ambient temperature: ±0.25% over operating temperature range;

Impact of the installation location: the installation is not affected as long as the sensor can be fully charged and enough straight sections are ensured before and after.

Sensor parameters

Nominal diameter

1 inch to 20 inch ( DN15 to DN500 )

Temperature range of the measured fluid

-29 to 80ºC

Body material

SUS304 stainless steel

Flange material and shell

Carbon steel, SUS304 stainless steel (optional)

Shell coating

Anti-corrosion polyester paint

Lining material

Ceramic lining

Electrode material

Tungsten carbide electrode (detachable)

Process connection

PN1.6mPa to PN25mPa

Lining protection ring

316 manganese chromium allo

Sensor protection level

IP65,IP68

Converter parameters

Ambient temperature range

- 20 to 149 of (- 29 to 65 ºC)

Shell material

Low copper die-casting aluminum Nema 4X ,IEC60529 IP66 (standard), or stainless steel material converter shell

Power

AC 86 to 265V, 50/60HZ, 1A fast fuse insurance; DC 16V to 36V, 1A fast fuse insurance

Output

4-20 mA output, pulse or frequency output

Communication protocol

RS485 communication, Hart protocol can be selected

Protection level

IP65/IP68

Correction

10-segment nonlinear correction

LCD display

Showing instantaneous flow, total volume, flow rate, etc.

Excitation method

Special high voltage frequency excitation mode