Clamp type electromagnetic flowmeter

It is an induction instrument that measures the volume flow rate of conductive medium inside a tube based on Faraday's law of electromagnetic induction. It uses embedded technology with a microcontroller to achieve digital excitation, and adopts CAN fieldbus on the electromagnetic flowmeter,
The electromagnetic flowmeter is specially designed with a backlit wide temperature Chinese LCD display, which is fully functional, practical, intuitive, and easy to operate, reducing the inconvenience caused by the English menu of other electromagnetic flowmeters. In addition, the 4-6 multi electrode structure is designed to further ensure measurement accuracy and eliminate the need for grounding rings at any time, reducing the trouble of instrument volume and installation and maintenance. The electromagnetic flowmeter can not only meet on-site display requirements, but 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, water supply and drainage.

Scope of application: Measuring the volumetric flow rate of conductive liquids
Principle:
It is based on Faraday's law of electromagnetic induction: when a conductive liquid cuts magnetic field lines in a magnetic field, an induced potential is generated in the conductor, and the induced potential E is: E＝KBVD, In the formula:
K - Instrument constant
B - Magnetic induction intensity
V - Average flow velocity
D - Inner diameter of pipeline
characteristic:
1. The measurement of flow rate is not affected by changes in density, viscosity, temperature, pressure, and conductivity of the flow rate. The sensor induced voltage signal is linearly related to the average flow rate, resulting in high measurement accuracy
2. There is no obstruction in the measuring pipeline, so there is no additional pressure loss. There are no movable parts in the measuring pipeline, so the sensor has a long lifespan
3. The straight pipe section required for the sensor is relatively short, making it easy to install
4. The sensor part only has the inner lining and electrodes in contact with the measured liquid. As long as the electrode and inner lining materials are selected reasonably, they can resist corrosion and wear
5. A bidirectional measurement system that can measure both forward and reverse flow rates.
Product advantages and unique selling points:
1. The most important component of the sensor - the coil - is optimized in design and undergoes the strictest real current test 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 technology. Although the cost is high, it can ensure the reliability of welding (welding is the main production process of the sensor), especially the last welding process after installing the coil. Using argon arc welding technology can ensure that the installed coil is not damaged
5. Adopting a grounding electrode structure to form a balanced electrode plane ensures that the entire process of measuring the average speed is limited to the balanced electrode plane, which can effectively eliminate electrical noise interference and provide accurate measurement results
6. Adopt customized double-layer shielded cables
7. Programmable low-frequency rectangular wave excitation improves the stability of flow measurement and reduces power loss
8. High frequency excitation is used for measuring special media (such as slurry) to eliminate clutter interference
9. Adopting a 16 bit embedded microprocessor with fast computing speed
10. Fully digital processing, strong anti-interference ability, 11. Ultra low EMI switching power supply, suitable for a wide range of power supply voltage changes, resistant to EMC
12. Complete all functional designs using a single circuit board, utilizing SMD devices and surface mount SMT technology
13. Clear 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. 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
Selection:
1. Conductivity of the tested fluid
2. Diameter, working pressure, and working temperature of the sensor
3. Inner lining material, electrode material and type of sensor
Installation requirements:
1. The installation point should be selected at the lowest point of the pipeline or vertically upwards
2. Ensure that the straight pipe section is in 3D after the first 5D
Wiring, setting, and debugging:
Wiring: The connecting wires between the split types are RVVP2 * 32/0.2 shielded wires for the signal cable and YHZ-2 * 1 for the excitation cable, both of which have the same length.
Settings: pipe diameter, flow unit, instrument coefficient, range output.
Debugging: Check if all parameter settings are correct.
Technical Parameter
Instrument accuracy: pipeline type 0.5 level, 1.0 level; Insertion type 2.5 level
Measurement medium: various liquid and liquid-solid two-phase fluids with conductivity greater than 5 μ S/cm.
Flow velocity range: 0.2-8m/s
Work pressure: 1.6MPa
◆ Environmental temperature:- 40℃～+50℃
◆ Medium temperature: PTFE lining ≤ 180 ℃
Rubber material lining ≤ 60 ℃
Explosion proof mark: Exmibd Ⅱ BT4
Explosion proof certificate number: GYB01349
◆ External magnetic interference: ≤ 400A/m
◆ Shell protection: integrated type: IP65；
Detached type: Sensor IP68 (3 meters underwater, limited to rubber lining)
Converter IP65
Output signal: 4-20mA DC， Load resistance 0-750 Ω
Communication output: RS485 or CAN bus
◆ Electrical connection: M20 × 1.5 internal thread, φ 10 cable hole
Power supply voltage: 90-220V AC, 24 ± 10% V.DC
◆ Maximum power consumption: ≤ 10VA
instrument selection
◆ Range confirmation
The flow rate of the medium measured by the general industrial electromagnetic flowmeter should be 2-4m/s. In special circumstances, the minimum flow rate should not be less than 0.2m/s and the maximum should not be greater than 8m/s. If the medium contains solid particles, the commonly used flow rate should be less than 3m/s to prevent excessive friction between the lining and the electrode; For viscous fluids, the flow velocity can be chosen to be greater than 2m/s. A higher flow velocity helps to automatically eliminate the effect of viscous substances attached to the electrode, which is beneficial for improving measurement accuracy.
Under the condition that the range Q has been determined, the size of the flowmeter diameter D can be determined based on the range of flow velocity V mentioned above, and its value can be calculated by the following formula:
Q=πD2V/4
Q: Flow rate (㎡/h) D: Inner diameter of pipeline V: Flow rate (m/h)
The range Q of the electromagnetic flowmeter should be greater than the expected maximum flow value, while the normal flow value should be slightly greater than 50% of the flowmeter's full-scale scale.
Advantages of electromagnetic flowmeter:
The measurement of flow rate is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. The sensor induced voltage signal is linearly related to the average flow rate, resulting in high measurement accuracy (0.3-0.5%) and a wide range ratio (1:1500).
There is no obstruction in the measuring pipeline, so there is no additional pressure loss, which has significant energy-saving significance.
There are no movable parts inside the measuring pipeline, so the sensor has a long lifespan.
The straight pipe section required for the sensor is relatively short, making it easy to install.
Reasonable selection of electrode and lining materials can resist corrosion and wear.
The sensor can be selected as IP68 immersion type.
Adopting a backlit wide temperature dot matrix capacitive LCD display, all displays are in Chinese, with multiple functions and convenient operation for users, reducing unnecessary trouble and errors. A bidirectional measurement system that can measure both forward and reverse flow rates.
1. The measurement of flow rate is not affected by changes in density, viscosity, temperature, pressure, and conductivity of the flow rate. The sensor induced voltage signal is linearly related to the average flow rate, resulting in high measurement accuracy
2. There is no obstruction in the measuring pipeline, so there is no additional pressure loss. There are no movable parts in the measuring pipeline, so the sensor has a long lifespan
3. The straight pipe section required for the sensor is relatively short, making it easy to install
4. The sensor part only has the inner lining and electrodes in contact with the measured liquid. As long as the electrode and inner lining materials are selected reasonably, they can resist corrosion and wear
5. A bidirectional measurement system that can measure both forward and reverse flow rates.
Stainless steel electromagnetic sensor:
Nominal diameter: DN6-3000mm
Nominal pressure: 0.6, 1.0, 1.6, 4.0 MPa (high pressure can be processed according to user requirements)
Accuracy: ± 0.2% ± 0.5% (indication error)
Measurement range (flow rate): 0-1m/s to 0-10m/s
Medium temperature: Separation type -10 ℃~+80 ℃ (PTFE and F46 lining -10 ℃~+180 ℃)
Integrated -10 ℃~+80 ℃
Environmental temperature -25 ℃~+60 ℃
Environmental humidity: 5-100% RH (relative humidity)
Dielectric conductivity: ≥ 5μS/cm
Installation: integrated, separate type
Protection level of the shell: Sensor IP65, IP68 optional (IP65: dust tight, water-resistant; IP68： Dust dense, capable of continuous immersion in water
Converter IP65
Electrode structure: Three electrode structure with scraper electrode structure
Maximum temperature of the tested medium: chloroprene rubber lining
The highest temperature is 80 ℃, and the highest temperature for polyurethane lining is 80 ℃,
The maximum temperature for PTFE lining is 180 ℃,
High temperature resistant rubber lining can withstand temperatures up to 120 ℃.
Environmental temperature: -10 to+50 ℃
Application, parameters and configuration of clamp type electromagnetic flowmeter:
1. Easy to install
2. In the health industries such as food and medicine, the process often requires the use of high-temperature steam for cleaning and disinfection to prevent bacterial growth. Therefore, the connection between pipelines and flow meters in the health industry generally uses quick couplings, namely clamp type structures.
Flow velocity measurement range: （0.05-10）m/s
Measuring pipeline diameter: DN（6-200）mm
Measurement accuracy: Level 0.5
Work pressure:< 1.6MPa
Medium temperature: 0-180 ℃
Power consumption:< 20VA
Parameters of split type electromagnetic converter:
Tested fluid conductivity: ≥ 5 us/cm
Full scale flow rate: 0.3m/s ---12 m/s
Measurement error: ± 0.5% of the indicated value
Environmental temperature:- 25℃-+180℃
Rated working pressure (MPa): 4.0, 1.6, 1.0, 0.6 (customized for pressures greater than 4.0)
Installation and connection: According to flange standards such as GB9115-88, GB9116-88, GB9119-88, JB/T81-94, DIN, ANSI, or as per user requirements (any connection shall comply with relevant standards in the petroleum industry)
Protection level: Standard type: IP65 (anti spray type); IP68 (submersible type)
Explosion proof electromagnetic converter parameters:
This configuration outputs explosion-proof type
Output signal: 4-20mA d. c., 0~1kHz
Flow display function: 1. Free switching between Chinese and English menus, wide and high-definition LCD backlight display.
2. Display cumulative flow rate in both directions, instantaneous flow rate, flow velocity, flow percentage, etc.
Communication function: RS485 communication interface
Alarm: Air traffic control, excitation, upper and lower limits of flow
Short term data protection time: not less than 10 years (without any auxiliary power supply)
Power supply: Standard type: 220va.c.50Hz; Special type 24V. c
Power consumption: 220va