Corrosive sewage flowmeter

Selection parameters: Choose appropriate specifications for measuring the properties of the medium, including the nominal diameter (inner diameter), working pressure, working temperature, flow range, installation method, and environmental conditions of the pipeline.

Jiangsu Huayun Instrument provides you with technical support for liquid and gas flow measurement systems, serving you in all aspects.

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Overview of Corrosive Sewage Flow Meter Products

An electromagnetic flowmeter consists of two parts: a sensor that directly contacts the pipeline medium and an upper end signal converter. It works based on Faraday's law of electromagnetic induction and is used to measure the flow rate of conductive liquids with a conductivity greater than 3 μ s/cm. It is an instrument for measuring the flow rate of conductive media. In addition to measuring the flow rate of general conductive liquids, it can also be used to measure highly corrosive liquids such as strong acids and alkalis, as well as liquids with uniformly suspended liquid-solid phases, such as mud, slurry, pulp, etc. Specially designed with backlit widescreen display The English LCD display is fully functional, practical, intuitive, and easy to operate. While meeting on-site display requirements, it can also output 4-20mA current signals for recording, adjustment, 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.

The main advantages of corrosive sewage flow meters are as follows:

1) The sensor structure is simple, with no movable parts inside the measuring tube and no throttling components that hinder fluid flow. So when the fluid passes through the flowmeter, it will not cause any additional pressure loss, making it one of the flow meters with lower operating energy consumption.

2) It can measure the flow rate of contaminated media, corrosive media, and suspended liquid-solid two-phase flow. This is because there are no obstructing flow components inside the instrument measuring tube, and only the inner lining and electrodes of the measuring tube are in contact with the measured fluid. The material can be selected according to the properties of the measured fluid. For example, using polytetrafluoroethylene or polytetrafluoroethylene as lining can measure various corrosive media such as acids, alkalis, salts, etc; The use of wear-resistant rubber as an inner lining is particularly suitable for measuring liquid-solid two-phase flows such as slurry and cement slurry with solid particles and high wear, as well as various suspended liquids such as fibrous liquids and pulp.

3) It is a volumetric flow measurement instrument that is not affected by the temperature, viscosity, density, or conductivity (within a certain range) of the measured medium during the measurement process. Therefore, after being calibrated with water, electromagnetic flow meters can be used to measure the flow rate of other conductive liquids.

4) The output is only proportional to the average flow velocity of the measured medium, and is independent of the flow state under symmetric distribution (laminar or turbulent). So the range of flow meters is extremely wide, with a measurement range of up to 100:1, and some even have an operational flow range of up to 1000:1.

5) No mechanical inertia, sensitive response, can measure instantaneous pulsating flow, and can also measure flow in both positive and negative directions.

6) The diameter range of industrial electromagnetic flow meters is extremely wide, ranging from a few millimeters to several meters, and there are already real flow calibration equipment with a diameter of up to 3m in China, laying the foundation for the application and development of flow meters.

The main shortcomings of electromagnetic flow meters currently still exist as follows.

1) Cannot be used to measure gases, vapors, and liquids containing large amounts of gas.

2) It cannot be used to measure liquid media with very low conductivity, such as petroleum products or organic solvents. Currently, electromagnetic flow meters are powerless.

3) Ordinary industrial flow meters cannot be used to measure high-temperature media due to limitations in the lining material and electrical insulation material of the measuring tube; Without special treatment, it cannot be used for measuring low-temperature media to prevent insulation damage caused by condensation (frost) outside the measuring tube.

4) Easily affected by external electromagnetic interference.

Characteristics of corrosive sewage flowmeter products

1. The coil, an important component of the sensor, has been optimized through rigorous real current testing to ensure the measurement accuracy of the product

2. The signal electrode undergoes thorough electrostatic shielding treatment to ensure that small signals are not interfered by the coil and to guarantee measurement accuracy at low flow rates

3. The coil is isolated from the outside world to ensure its long-term insulation strength, which in turn guarantees the long-term measurement accuracy of the sensor

4. All welding processes of the sensor are carried out using argon arc welding, which, although costly, ensures the reliability of welding (welding is the main production process of the sensor), especially the welding process after installing the coil. Using argon arc welding technology can ensure that the installed coil is not damaged

5. By adopting a grounding electrode structure, a balanced electrode plane is formed to ensure that the entire process of measuring the average speed is limited within the balanced electrode plane, which can effectively eliminate electrical noise interference and provide measurement results

6. Using customized double-layer shielded cables

7. Programmable low-frequency rectangular wave excitation improves the stability of flow measurement and reduces power loss

8. Special medium measurement (such as slurry) uses high-frequency excitation to eliminate clutter interference

9. Adopting a 16 bit embedded microprocessor, it has fast computing speed and high accuracy

10. All digital processing, strong anti-interference ability, reliable measurement, high accuracy

11. Ultra low EMI switching power supply, suitable for a wide range of power supply voltage changes, with good EMC resistance performance

12. Complete all functional designs with a single circuit board, using SMD devices and surface mount SMT technology, resulting in high circuit reliability

13. High definition backlit Chinese LCD display, displaying cumulative flow rate, instantaneous flow rate, flow percentage, etc

14. Menu operation, easy to use, simple to operate, easy to learn and understand

15. A bidirectional measurement system with three integrators inside that can display forward cumulative quantity, reverse cumulative quantity, and differential cumulative quantity respectively

16. Equipped with self checking and self diagnostic functions, and displayed on the screen

17. Unique lightning protection design

Technical parameters of corrosive sewage flowmeter

1. Execution standard: JB/T 9248-1999;

2. Nominal diameter: 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000;

3. High flow rate: 15m/s;

4. Degree: ± 0.3% of the indicated value of DNl5-DN600 (flow rate ≥ 1m/s); ± 3mm/s (flow rate<1m<span="">/s), ± 0.5% of DN700-DN3000 indication (flow rate ≥ 0.8m/s); ± 4mm/s (flow rate<0.8m<span="">/s);

5. Fluid conductivity: ≥ 5uS/cm;

6. Nominal pressure: DNl5～DN150 4.0MPa，DNl5～DN600 1.6MPa，DN200～DN1000 1.0MPa，DN700～DN3000 0.6MPa， Special order 6.3, 10MPa;

7. Environmental temperature: Sensor -25 ℃ -60 ℃, converter and integrated -10 ℃ -60 ℃;

8. Lining materials: polytetrafluoroethylene, chloroprene rubber, polyurethane, perfluoroalkoxy (F46), mesh PFA;

9. High fluid temperature - body type: 70 ℃;

***High fluid temperature separation type: Polychloroprene rubber lining at 80 ℃; 120 ℃ (specified when ordering), polyurethane lining 80 ℃, PTFE lining 100 ℃; 150 ℃ (specified at the time of ordering), 100 ℃ for perfluoroethylene propylene (F46); 150 ℃ (specified when ordering), with PFA mesh added at 100 ℃; 150 ℃ (specified when ordering);

10. Signal electrode and ground electrode materials: stainless steel 0Crl8Nil2M02Ti, Hastelloy C, Hastelloy B, titanium, tantalum, platinum/iridium alloy, stainless steel coated tungsten carbide;

11. Electrode knife mechanism: DN300-DN3000;

12. Connecting flange material: carbon steel;

13. Grounding flange material: stainless steel 1Cr18Ni9Ti;

14. Imported protective flange materials: DN65-DN150 stainless steel 1Cr18Ni9Ti, DN200-DNl600 carbon steel and stainless steel 1Cr18Ni9Ti;

15. Shell protection: IP65 or IP68 for DNl5~DN3000 separable rubber or polyurethane lined sensors, IP65 for other sensors, body type flow meters, and separable converters;

16. Spacing (separated type): The distance between the converter and the sensor is generally not more than 100m;

Selection of lining materials for corrosive sewage flow meters

The lining material should be selected based on the corrosiveness, wear resistance, and temperature of the tested medium

Selection of Electrode for Corrosive Sewage Flow Meter

The material of the electrode should be selected based on the corrosiveness of the fluid being tested. Please refer to the relevant manual. For special fluids, a corrosiveness test should be conducted

Selection of installation location for corrosive sewage flowmeter

In order to ensure the stable and reliable operation of the electromagnetic flowmeter, the following requirements should be noted when selecting the installation location:

1. Try to avoid ferromagnetic objects and equipment with strong electromagnetic fields (such as large motors, transformers, etc.) to prevent the magnetic field from affecting the working magnetic field and flow signal of the sensor.

2. It should be installed in a dry and ventilated place as much as possible, avoiding direct sunlight and rain. The ambient temperature should be between -20 and+60 ℃, and the relative humidity should be less than 85%.

3. There should be ample space around the flowmeter for easy installation and maintenance.

Installation recommendations

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:

a. Increase the length of the front and rear straight pipe sections;

b. Adopting a traffic stabilizer;

c. Reduce the cross-section of measurement points.

Horizontal and vertical installation

Sensors can be installed horizontally and vertically, but it should be ensured to avoid the influence of sediment and bubbles on the measuring electrode, and the electrode axis should be kept horizontal. When installed vertically, the fluid should flow from bottom to top.

The sensor cannot be installed at the highest position of the pipeline, as this position is prone to the accumulation of air bubbles.

Ensure full pipe installation

Ensure that the flow sensor is filled with the measured fluid in the pipeline during measurement and that there is no non full pipe state. If the pipeline is not full or the outlet is empty, the sensor should be installed on a siphon tube.

Installation between bends, valves, and pumps

To ensure the stability of the measurement, a straight pipe section should be installed in front and behind the sensor, with its length given in the following figure. If it cannot be achieved, a current stabilizer should be used or the cross-sectional area of the measurement point should be reduced.

Sensors cannot be installed at the inlet of the pump

To avoid negative pressure, the sensor should not be installed at the inlet of the pump, but at the outlet of the pump.

The inlet and outlet straight pipe sections of the sensor

An ideal installation location should be chosen with sufficient straight pipe sections before and after the measurement point. The inlet straight pipe section should be ≥ 5D, and the outlet straight pipe section should be ≥ 3D (D is the nominal diameter of the sensor).

The inserted inlet straight pipe section should be ≥ 20 D, and the outlet straight pipe section should be ≥ 7D (D is the nominal diameter of the sensor).

Jiangsu Huayun Instrument Co., Ltd. is a professional manufacturer of intelligent flow meters, sewage flow meters, vortex flow meters, turbine flow meters and other flow meter products. Our company has many years of production experience. Determine the installation location of the instrument, ensure the straight pipe section, and create favorable environmental conditions for the installation and maintenance of the instrument. And you can always contact our company's sales or technical support department to ensure the correct selection. Welcome to come and negotiate and cooperate!