1. Overview
1.1 Characteristics
The LXZ series magneto electric intelligent flow meter (hereinafter referred to as the flow meter) is a new intelligent flow meter developed by our company using the most advanced magneto electric digital detection technology. The flow meter consists of a flow sensor and a display instrument (also known as a meter head). This series of flow meters combines the advantages of electromagnetic flow meters and vortex flow meters in design, and combines them with the actual situation of the oil field, highlighting their strengths and avoiding their weaknesses. It has the following significant features:
The structure of the flow sensor without mechanical wear is sturdy and reliable. There are no movable parts or lining materials in the flow channel of its surface chamber, which can avoid mechanical wear and greatly improve its service life.

The LXZ series magneto electric intelligent flowmeter is easy to use and disassemble. The flow sensor adopts a detachable or plug-in structure, which can facilitate maintenance and periodic calibration of indication errors.

Due to the use of advanced magneto electric digital detection technology, the anti vibration and anti-interference ability of the flowmeter is particularly strong, which is five to eight times higher than that of ordinary vortex flowmeters.
The circuit power consumption of the low-power flowmeter is only 0.24mW, and it uses four ordinary No. 5 alkaline dry batteries as power supply, which can be used continuously for more than two years.
The components that come into direct contact with the medium on the high-temperature and high-pressure flowmeter are made of high-temperature resistant materials, allowing the measured medium temperature to reach up to 120 ℃ (high-temperature type), and have formed a series of products with a nominal diameter of DN20-300mm and a nominal pressure of PN1-42Mpa.
The multifunctional flowmeter can display total flow, instantaneous flow, daily or shift flow, date, and store 2600 historical daily (shift) flow data for reference. In addition, it can also output pulse signals or analog signals and has an additional RS-485 communication interface.
Stable performance, high precision, advanced measurement principles, and highly reliable circuit design, as well as the adoption of eight segment nonlinear flow error correction processing, make the instrument more stable in performance, high in measurement accuracy, and long in service life.
1.2 Purpose and Scope of Application
Mainly used for high-pressure water injection and mixing in oil fields, oily wastewater treatment in pump stations, and measurement of water flow in water supply and drainage pipelines. It is also widely used in industries such as chemical, power, pharmaceutical, papermaking, and environmental protection, as well as in measuring the volume flow rate of conductive liquids in closed pipelines for urban water supply and drainage engineering.
But it is not suitable for measuring the flow rate of non-conductive media such as gases, oils, and organic solvents.
1.3 Type
Flow meters can be divided into right angle insertion type, straight through insertion type, straight through disassembly type, and integral type according to the structural form of flow sensors.
Flow meters can be divided into flange connection type, joint quick installation type, welding type, and clamp connection type according to the installation and connection method.
Flow meters can be divided into ordinary and explosion-proof types according to the requirements of the operating environment
1.4 Model designation and definition



1.5 Usage conditions
a) Environmental temperature: -30 ℃~+80 ℃ (ordinary type), -20 ℃+40 ℃ (explosion-proof type);
b) Relative humidity of the environment: ≤ 95%;
c) Atmospheric pressure: 86kPa to 106kPa.
d) Applicable medium temperature: -30 ℃~+80 ℃, -30 ℃~+120 ℃ (optional);
e) Dielectric conductivity: ≥ 5 μ s/cm;
f) Applicable media: single-phase conductive liquids such as water, sewage, acid, alkaline solution, etc. (The use of acidic or alkaline liquids should be specified when ordering)
1.6 Safety
The explosion-proof flowmeter is designed and manufactured in accordance with the technical requirements of the national explosion-proof electrical product standards GB3836.1 and GB3836.2, ensuring safe use in hazardous areas with explosive gas environments. The explosion-proof mark is Exd II BT4.
2. Working principle
The flowmeter is manufactured based on the principle of combining Faraday magneto electric induction with Karman vortex street, as shown in Figure 1. A triangular cylinder (vortex generator) perpendicular to the flow direction of the measured medium is installed in the internal flow channel of the flow sensor, and a magnet component and corresponding electrode component are installed on the outer wall downstream of it. In this way, a strong magnetic field can be formed around the electrode. When the medium flows towards the vortex generator, two sets of regular staggered vortices will be alternately generated on both downstream sides. Due to the movement of these vortices, the magnetic field lines are cut, and an induced electromotive force with the same waveform and vortex frequency is generated in the medium flow field. This electromotive force is detected by the electrodes as an electrical signal. Practice has proven that the frequency of vortex generation within a certain range of flow velocity is proportional to the flow rate.
The high-frequency oscillation signal from the input electrode of the display instrument (header) is modulated by vortex frequency, and the modulated high-frequency signal enters the microcontroller for operation and processing, accurately detecting the flow signal, and then entering the microcontroller for flow calculation and functional processing. The microcontroller is programmed with time and date programs, which are stored in a large capacity serial memory to record the daily cumulative flow rate and record the date. The accumulated daily flow rate becomes the total flow rate. Finally, the date, total flow rate, and instantaneous flow rate are displayed on the LCD screen. Alternatively, the daily traffic search key can be used to display the daily traffic for a certain date.

Figure 1 Schematic diagram of measurement principle
3. Main technical parameters
a) Accuracy level: Level 1;
b) Working current:<80 μ A;
c) Working voltage: DC3V ± 0.4V;
d) Measurement range: Reynolds number Re is between 8000 and 7000;
e) Range ratio: 1:20
f) Active pulse signal output (three wire system):
1) Working voltage of output circuit: DC 5V~24V; Signal amplitude: Low level 0V, high level 4V~23V
g) Passive pulse signal output (two-wire switch signal):
1) Conducting impedance: ≤ 100 Ω; 2) Turn off impedance:>2M Ω;
h) Analog signal output (three wire system):
1) Working voltage of the output circuit: DC 15V~24V; 2) Output current: 4mA~20mA (load impedance: 250 Ω);
i) Resistance coefficient Cd of pressure loss at 0.7Qmax:<2.4
4. Structural diagram and connection dimensions
4.1 Direct disassembly flange connected flowmeter and direct insertion flange connected flowmeter (see Figure 2, Figure 3, and Table 2)

Figure 2: Direct disassembly flange connected flowmeter Figure 3: Direct insertion flange connected flowmeter

4.2 Right angle insertion flange connection flowmeter and right angle insertion welding flowmeter (see Figure 4, Figure 5, and Table 3)

1. Header 2 Table body 3 Table core

Figure 4 Right angle insertion flange connection flowmeter Figure 5 Right angle insertion welding flowmeter

4.3 Direct connector quick installation flowmeter and direct integral clamp flowmeter (see Figure 6 and Figure 7)

Figure 6: Direct connector quick installation flowmeter Figure 7: Direct integral clamp flowmeter

LXZ series magneto electric intelligent flowmeter