Shijiazhuang sewage flowmeter

Shijiazhuang sewage flowmeter

The rise and fall times determine the pulse behavior, and therefore also determine the carving speed. The nitrogen in the mixed gas will reduce the pulse frequency to around 1kHz. This is sufficient for many past applications, but not enough for future needs. A typical laser power time relationship graph shows a deviation value of ± 5% to 1%. This is not suitable for controlling 3D carving materials. The laser pointing stability of various tested lasers is surprisingly good, which will have a direct impact on the use of acousto-optic modulators (which are highly sensitive to incident angles). At the power pole near the acousto-optic modulator, germanium crystals are highly sensitive to adverse laser field modes.

Electromagnetic flowmeters (EMF) are a new type of flow measurement instrument that rapidly developed in the 1950s and 1960s with the advancement of electronic technology. An electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow rate of a conductive fluid based on the induced electromotive force when the fluid passes through an external magnetic field.

Shijiazhuang sewage flowmeter

There are many reasons for the formation of PID caused by leakage current in photovoltaic modules. External factors may include humid environments, contamination of the module surface by conductive, acidic, alkaline, and ionized objects, as well as attenuation phenomena, which can lead to the generation of leakage current. In terms of the system, the grounding method of the inverter and the position of the components in the array determine whether the battery cells and components are biased positively or negatively. The actual operation and research results of the power station indicate that if all components between the middle component of the entire train and the negative output terminal of the inverter are under negative bias, the PID phenomenon of the components closer to the output terminal becomes more pronounced. The PID phenomenon is not significant when all components between the middle component and the positive output terminal of the inverter are under positive bias.

structure

The structure of an electromagnetic flowmeter mainly consists of a magnetic circuit system, a measuring conduit, electrodes, a housing, a lining, and a converter.

Magnetic circuit system: Its function is to generate a uniform DC or AC magnetic field. The DC magnetic circuit is implemented using magnets, which has the advantages of a relatively simple structure and less interference from AC magnetic fields. However, it can easily polarize the electrolyte liquid inside the measuring tube, causing the positive electrode to be surrounded by negative ions and the negative electrode to be surrounded by positive ions, resulting in electrode polarization and an increase in internal resistance between the two electrodes, which seriously affects the normal operation of the instrument. When the diameter of the pipeline is large, the magnet is also large, bulky, and uneconomical. Therefore, electromagnetic flow meters generally use alternating magnetic fields and are excited by a 50HZ power supply.

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

2. Measure the flow components inside the tube, with no pressure loss and low requirements for straight pipe sections. Adaptability to slurry measurement;

3. Reasonably selecting sensor lining and electrode materials, which have good corrosion resistance and wear resistance;

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

5. The converter can be integrated or separated from the sensor;

6. The converter adopts a 16 bit high-performance microprocessor, 2x16 LCD display, convenient parameter setting, and reliable programming;

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

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

9. The measurement accuracy is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. The sensor's induced voltage signal is linearly related to the average flow rate, resulting in high measurement accuracy.

10. There is no obstruction in the measuring pipeline, so there is no additional pressure loss; There are no movable parts inside the measuring pipeline, so the sensor has an extremely long lifespan.

11. Due to the fact that the induced voltage signal is formed in the entire space filled with a magnetic field and is the average value on the surface of the pipeline, the sensor requires a shorter straight pipe section, with a length of 5 times the diameter of the pipeline.

12. The converter adopts advanced microcontroller (MCU) and surface mount technology (SMT), with reliable performance, high accuracy, low power consumption, stable zero point, and convenient parameter setting. Click on the Chinese display LCD to show cumulative flow, instantaneous flow, flow rate, flow percentage, etc.

13. A bidirectional measurement system that can measure both forward and reverse flow rates. Using special production processes and high-quality materials to ensure the stability of product performance over a long period of time.

Piezoelectric sensors hardly experience wear during use, and have almost constant sensitivity and excellent stiffness throughout the entire operating temperature range. Piezoelectric sensors allow users to choose between two independent measurement ranges - with almost no impact on resolution. Reliable wireless data transmission KiRoadWireless P1 synchronously transmits data through a wireless local area network. Each KiRoad wireless system is equipped with an independently encrypted wireless local area network, allowing multiple systems to be tested simultaneously. Through this technological advancement, we have elevated the reliability and user friendliness of transmission technology to a whole new level.

Instructions for use

The electromagnetic flowmeter has two operating states: automatic measurement state and parameter setting state.
When the instrument is powered on, it automatically enters the measurement state. In automatic measurement mode, the electromagnetic flowmeter automatically completes various measurement functions and displays corresponding measurement data. In the parameter setting state, the user uses four panel keys to complete the instrument parameter setting.
1. Key function

1.1 Key functions in automatic measurement mode
Down key: Loop through the selection screen to display content in the downward direction;
Up key: Loop through the screen to select the up display content;
Composite key+confirm key: enter parameter setting state;
Confirm button: Return to automatic measurement mode;
Adjustment of LCD display contrast in measurement state: The small LCD is adjusted by pressing the "composite key+up key" or "composite key+down key" for a few seconds; The large LCD is achieved by adjusting the potentiometer on the back of the large LCD.
1.2 Key functions in parameter setting state
Down key: Subtract 1 from the number at the cursor;
Up key: add 1 to the number at the cursor;
Composite key+down key: Move the cursor to the left;
Composite key+up key: Move the cursor to the right;
Confirm key: Enter/Exit submenu;
Confirm button: Press continuously for two seconds in any state to return to automatic measurement mode.
Note: When using the "composite key", you should first press the composite key and then simultaneously hold down the "up key" or "down key"
2. In the parameter setting state, if there is no button operation within 3 minutes, the instrument will automatically return to the measurement state.
3. The flow direction for zero point correction can be selected by moving the cursor to the "+" or "-" on the left and using the "up" or "down" keys to switch it to the opposite direction of the actual flow.
4. To select the unit of flow, you can move the cursor to the original displayed flow unit in the "Flow Range Setting" menu, and then use the "Up" or "Down" keys to switch to meet your needs.
2. Parameter setting function key operation
To set or modify the parameters of an electromagnetic flowmeter, it is necessary to transition the flowmeter from the measurement state to the parameter setting state. In the measurement state, press the "composite key+confirm key" to display the state transition password (0000). According to the confidentiality level, modify the password provided by the manufacturer accordingly. After pressing the "composite key+confirm key" again, it will enter the desired parameter setting state.

Installation of Intelligent Electromagnetic Flow Meter Sensor on Process Pipeline

1. The intelligent electromagnetic flowmeter blockage tube must be filled with medium at any time and cannot work normally without filling or emptying the tube. When the medium is not fully filled in the pipe, the method of raising the height of the outlet pipe at the back of the flowmeter can be used to fill the pipe with the medium, avoiding the incomplete pipe and gas from adhering to the electrode.

2. Vacuum inside the pipeline can damage the lining of the flowmeter, so special attention should be paid.
3. The positive direction of flow should be consistent with the positive direction indicated by the arrow on the flowmeter.
4. The intelligent electromagnetic flowmeter can be installed on straight pipelines, as well as on horizontal or inclined pipelines, but it requires that the center line of the two electrodes be in a horizontal state.
5. For liquid and solid two-phase fluids, vertical installation is used to allow the measured medium to flow from top to bottom, which can evenly wear the lining of the flowmeter and extend its service life.
6. Ensure that there is sufficient space near the pipeline flange for the installation and maintenance of the flowmeter.
If there is vibration in the measuring pipeline, there should be fixed supports on both sides of the flowmeter.
8. If the measuring medium is a heavily polluted liquid, a flowmeter body can be installed in the bypass pipeline without interrupting the process operation, which can be emptied and cleared.
9. When installing a flow meter with PTFE lining, the bolts connecting the flange should be tightened evenly, otherwise it is easy to crush the PTFE lining. Use a torque wrench.

The Fourier transform infrared spectroscopy technology combined with its various forms of non-contact measurement methods can achieve active and passive measurement of gases, which is very suitable for on-site monitoring of emissions in chemical industrial parks. There are two main issues with using FTIR technology for gas quantitative analysis. Firstly, the absorption cross-section of gas molecules is significantly affected by gas pressure and temperature. Secondly, the resolution of FTIR systems is generally much smaller than the broadening of gas molecule spectral lines, and the instrument line shape is affected by factors such as interference pattern sampling, apodization, and radiation incident solid angle. These influencing factors result in significant shifts and broadening of the apparent spectral lines that are difficult to ignore. In the late 1980s, with the advancement of science and technology, environmental monitoring technology developed rapidly. Modern methods such as instrument analysis and computer control were widely used in atmospheric environmental monitoring, and various automatic continuous monitoring systems were introduced one after another.