XE-LDEModel of sewage flow meterThe series electromagnetic flowmeter is an induction instrument that measures the volumetric flow rate of the conductive medium inside the museum based on Faraday's law of electromagnetic induction. It uses embedded microcontroller technology to achieve digital excitation, and at the same time, CAN on-site president is used on the electromagnetic flowmeter, which has reached the domestic level of technology. Electromagnetic flowmeter（Sewage flow meter）While meeting on-site display requirements, it can also output 4-20mA current signals for recording, regulation, and control purposes. It has been widely used in chemical industry, environmental protectionmetallurgyIndustrial technology and management departments such as pharmaceuticals, papermaking, and water supply and drainage.
XE-LDE seriesModel of sewage flow meterIn addition to measuring the flow rate of general conductive liquids, it can also measure the volumetric flow rate of liquid-solid two-phase flow, high viscosity liquid flow, and salt, strong acid, and strong alkali liquids.

Sewage flow meterKey points for selection:

Electromagnetic flow meters have a wide range of applications. Large caliber instruments are commonly used in water supply and drainage engineering, while small and medium-sized instruments are commonly used in solid-liquid two-phase difficult to measure fluids or high demand places, such as measuring pulp and black liquor in the paper industry, slurry in the non-ferrous metallurgy industry, coal slurry in the coal preparation plant, highly corrosive liquids in the chemical industry, and controlling and monitoring cooling water in blast furnace tuyere in the steel industry. Flow measurement and control of long-distance pipeline coal hydraulic transportation. Small caliber and micro caliber are commonly used in places with hygiene requirements such as the pharmaceutical industry, food industry, and biotechnology.

1. Choose the appropriate type based on the characteristics of integrated and separated electromagnetic flow meters. The installation and wiring of the integrated electromagnetic flowmeter are convenient, with moderate accuracy, and should not be installed below the ground to prevent the converter from being submerged in water. Separated electromagnetic flowmeter with high accuracy, converter and sensor installed remotely, more suitable for on-site installationenvironmentIn places with poor quality (such as hazardous, toxic, and easily flooded areas), but with strict installation and wiring, interference signals may be introduced.

2. Choose the appropriate electrode form. For media that do not produce crystals, scars, or contaminate electrodes, standard electrodes can be used. Otherwise, clean electrodes or electrodes with cleaning connection devices can be used. For sludge testing, replaceable electrodes can also be used.

3. Select electrode materials based on the corrosiveness of the tested medium.

Electrode selection:

4. Select lining materials based on the corrosiveness, wear resistance, and temperature of the tested medium.

5. Protection level of electromagnetic flowmeter. According to the national standard GB4208-1984, which is approximately equivalent to the IEC standard (IEC529-7B) of the Electrical Commission, the standard for the protection level of the enclosure is IP65, which is an anti spray type that allows water to be sprayed onto the instrument from any direction, with a spray pressure of 30Kpa. The water output is 0.75m3/h, and the distance between the water spray port and the instrument is 3m. IP67 is waterproof, which means that the instrument can be completely immersed in water, and the highest point should be at least 150cm underwater for at least 30 minutes. IP68 is a submersible type that can work underwater for a long time. According to the above regulations, instruments that are prone to flooding when installed underground should be rated IP68, while instruments installed above ground should be rated IP65.

6. Select grounding based on the insulation of the connecting instrument pipeline.

7. Select the nominal pressure of the electromagnetic flowmeter based on the highest pressure of the measured medium. For flow measurements with medium pressures of 10MPa, 16MPa, 25MPa, and 32MPa, high-pressure electromagnetic flow meters should be selected. Its large diameter is 100mm

sewageflow meterTechnical Specifications:

3、 Working principle of sewage flowmeter：

Number of sewage flow metersConnection type with sensors

• Circular shell integrated type: circular shell, the shell is directly connected with the sensor flange, explosion-proof design;
• Square shell integrated type: square shell, the shell is directly connected with the sensor flange;
• Square shell split type: wall mounted square shell, converter connected with sensor cable;

1.5 Installation dimension drawing

2. Basic Circuit of Converter

The electromagnetic flowmeter converter provides stable excitation current to the excitation coil of the electromagnetic flow sensor. The preamplifier amplifies and converts the electromotive force induced by the sensor into standard current or frequency signals, which facilitates the display, control, and adjustment of flow. picture2-1The circuit structure of the converter is shown.

Installation:

(1) Sensors and converters are packaged as a complete set, used together, and cannot be replaced at will.
(2) The usage condition is that the liquid flowing through the measuring pipeline must be in a fully filled state, otherwise it will affect the measurement accuracy. The installation position of the sensor should be preferably on a vertical pipeline, and the liquid inside the vertical pipeline must flow from bottom to top.
(3) It cannot be installed on the horizontal section of the process pipeline, as the highest point of the pipeline is prone to gas accumulation.
(4) Installed on horizontal or inclined process pipelines, the upstream straight pipe section is generally not less than 5D, and the downstream straight pipe section is generally not less than 2D. D is the inner diameter of the pipeline.
(5) The measuring tube is lined with anti-corrosion material and cannot be operated under negative pressure or installed on the pump suction pipe.
(6) The installation location should be far away from strong magnetic fields, and there should be no power equipment or magnetic starters near the installation location.
(7) When installing on horizontal or inclined process pipelines, the two detection electrodes should be in a horizontal position and should not be directly above or below the process pipeline.
(8) Good grounding is necessary to reduce the introduction of interference signals.

Precautions for installation before wiring

The replacement and related operations of internal circuit boards and other components must be carried out by professional engineers or technicians.

Before opening the shell cover, ensure that the equipment is powered off for at least 10 minutes. The opening of the shell cover must be carried out by professional engineers or technicians.

Explosion proof converters must be transferred to a safe area for maintenance, disassembly, and reassembly.

The converter circuit board components contain sensitive components that may be damaged by static electricity. Be careful during operation to avoid direct contact with the electronic components

When necessary, corresponding anti-static measures should be taken for the circuit patterns on the components or circuit boards.

Installation of:

1. Electromagnetic flow meters should be installed at the lower and vertically upward positions of horizontal pipelines, avoiding installation at the highest points and vertically downward positions of pipelines;

2. The electromagnetic flowmeter should be installed at the rising point of the pipeline;

3. When installing an open discharge pipeline, it should be installed at the lower part of the pipeline;

4. If the pipeline drop exceeds 5m, install an exhaust valve downstream of the sensor;

5. Electromagnetic flow meters should be installed with control valves and shut-off valves downstream of the sensor, rather than upstream of the sensor;

6. Sensors cannot be installed on the pumpimport and exportIt should be installed at the outlet of the pump;

7. The method of installing electromagnetic flowmeter in the measuring well;

Figure 7 Remarks: 1. Inlet 2. Overflow pipe 3 Inlet grille 4. Cleaning hole 5. Flow meter 6. Short pipe 7. Outlet 8. Discharge valve

How to choose the installation node correctly:
Choosing the correct installation point and installing the flow meter correctly are both very important steps. If there is a mistake in the installation process, it can affect the measurement accuracy in mild cases, the service life of the flow meter in severe cases, and even damage the flow meter.
Special attention should be paid when selecting the installation location:
The axis of the non measuring electrode must be approximately horizontal;

The measuring pipeline must be filled with liquid;
There should be a minimum of 5 * D (D is the inner diameter of the flowmeter) straight pipe section in front of the electromagnetic flowmeter, and a minimum of 3 * D (D is the inner diameter of the flowmeter) straight pipe section behind it;
The direction of fluid flow and the arrow direction of the flowmeter *;
Vacuum inside the pipeline can damage the lining of the flowmeter, so special attention should be paid;
There should be no strong electromagnetic field near the electromagnetic flowmeter;
There should be ample space near the electromagnetic flowmeter for installation and maintenance;
If there is vibration in the measuring pipeline, there should be fixed supports on both sides of the flowmeter. When measuring mixed liquids of different media, the distance between the mixing point and the flowmeter should be at least 30 × D (D mortar flowmeter inner diameter). To facilitate the cleaning and maintenance of the flowmeter in the future, a bypass pipeline should be installed;