Fire pump room flowmeter

Fire pump room flowmeter

The following are specific examples of the perfect application of this series of DC electronic loads in generator testing in the automotive electronics industry. The application case of DC electronic load in generator testing requires the electronic load to be able to be divided into four different items from idle to full speed of the generator during generator testing, simulating the power generation performance of the generator under various conditions during vehicle operation. During this entire process, real-time observation of voltage and current data is required. Traditional load boxes cannot meet this requirement, and the test data is inaccurate. Therefore, professional electronic loads must be used for testing. So why choose this electronic load series from Adidas ITECH for testing automotive generators? The reason is that it not only meets testing requirements, but also has significant advantages.

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.

Fire pump room flowmeter

Digital oscilloscopes can accurately capture various signals, making them one of the main equipment for signal acquisition, recording, and analysis in scientific research experiments and engineering projects. However, in many cases, it is necessary to process and analyze the data collected by the digital oscilloscope, and ultimately meet the requirements of remote automatic testing and analysis. So today we will talk about how to achieve remote control of an oscilloscope. Introduction to LabVIEW: Computers can control oscilloscopes by establishing connections with them through LAN or USB interfaces. As shown. When you hear about controlling an oscilloscope, everyone will think of using SCPI commands to control the oscilloscope.

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.

Measurement of AC voltage. The probe socket is the same as measuring DC voltage, but the knob should be turned to the required range at the AC gear "V~". There is no positive or negative distinction in AC voltage, and the measurement method is the same as before. Whether measuring AC or DC voltage, attention should be paid to personal safety and do not touch the metal part of the probe with your hands casually. Measurement of current: Measurement of direct current. First, insert the black probe into the "COM" hole. If measuring a current greater than 200mA, insert the red probe into the "10A" socket and turn the knob to the DC "10A" position; If measuring a current less than 200mA, insert the red probe into the "200mA" socket and turn the knob to the appropriate range within 200mA DC.

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.

M9703A has real-time DDC function and ultra-high bandwidth, which can be used as a solution for this testing system, especially suitable for calibration applications. The multi module processing synchronization function can provide phase coherence between channels. Although the reference solution is aimed at narrowband measurements, M9703A can also capture signals with wider bandwidths (up to 300MHz when using DDC features and up to 600MHz when not using DDC). Assuming that most phased array antennas operate at RF/microwave frequencies and use an intermediate frequency to digital converter, it is necessary to use analog mixing technology to down convert the captured signal to the intermediate frequency within the M9703A passband.