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Small caliber (small flow) electromagnetic flowmeter - principle of electromagnetic flowmeter
The ZNLD series small caliber (small flow) electromagnetic flowmeter has two combination forms: integrated and split. The output stage adopts electric
Product details
ZNLD series small caliber (small flow) electromagnetic flowmeterThere are two combination forms, one type and one type. The output stage adopts electrical isolation, which can be easily matched with rear instruments to achieve functions such as recording, controlling, and regulating flow. At the same time, the flowmeter is equipped with an RS485 communication interface, which can be interconnected with a computer. Each set of products is calibrated with water according to the flow rate required by the order, and usually can be put into use without any adjustments.
ZNLD seriesSmall caliber (small flow) electromagnetic flowmeterWorking principle: The measurement principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction; When a conductive liquid cuts magnetic field lines in a magnetic field, an induced potential E is generated in the conductor as follows: E=KBVD equation:
K - Instrument constant
B -- Magnetic induction intensity
V ------------ Measure the average flow velocity within the cross-section of the pipeline
D - Measure the inner diameter of the pipeline cross-section
ZNLD seriesSmall caliber (small flow) electromagnetic flowmeterFunctional features:
1. Free switching between Chinese and English menus, wide and high-definition LCD backlit display
2 internationally advanced chip machines (MCU) and surface mount technology (SMT)
3. Reliable performance, high accuracy, low power consumption, stable zero point, and convenient parameter setting
4. Display cumulative flow rate in both directions, instantaneous flow rate, flow velocity, flow percentage, etc
5 bidirectional measurement system, capable of measuring forward flow and reverse flow
6 alarm functions: air traffic control, excitation, upper and lower limits of flow
7-frequency output 4-20mA signal, flow output, cumulative pulse output, RS485 output
8 adopts advanced manufacturing technology, with stable and excellent performance
9 output ports, all input ports are equipped with safety lightning protection
10 self adjustable, flow upper and lower limits can be set by oneself
11 small signal removal
12 adopts efficient and high stability PWM wave excitation constant current source
13 damping coefficient optional
Long term storage of data after 14 short circuits
15 professional designs 4-6 multi electrode structures, further ensuring measurement accuracy and eliminating the need for grounding rings at all times, reducing instrument volume and installation and maintenance troubles.
The measurement of flow rate with a 16 meter coefficient 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.
ZNLD seriesSmall caliber (small flow) electromagnetic flowmeterMain technical performance:
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, etc., or according to user requirements (any connection shall comply with relevant standards in the petroleum industry)
Protection level: Standard type: IP65 (anti spray type); IP68 (submersible type)
Output signal: 4-20mAd.c., 0~1KHz
Flow display function: 1. Free switching between Chinese and English menus, with wide and high-definition LCD backlight display. Display cumulative flow rate, instantaneous flow rate, flow velocity, flow percentage, etc. in both forward and reverse directions.
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
ZNLD seriesConfirmation of the range of small caliber (small flow) electromagnetic flowmeter. Generally, the flow velocity of the measured medium in industrial use should be 2-4m/s. In special circumstances, the minimum flow velocity 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.
ZNLD seriesSmall caliber (small flow) electromagnetic flowmeterWorking principle: The measurement principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction; When a conductive liquid cuts magnetic field lines in a magnetic field, an induced potential E is generated in the conductor as follows: E=KBVD equation:
K - Instrument constant
B -- Magnetic induction intensity
V ------------ Measure the average flow velocity within the cross-section of the pipeline
D - Measure the inner diameter of the pipeline cross-section
ZNLD seriesSmall caliber (small flow) electromagnetic flowmeterFunctional features:
1. Free switching between Chinese and English menus, wide and high-definition LCD backlit display
2 internationally advanced chip machines (MCU) and surface mount technology (SMT)
3. Reliable performance, high accuracy, low power consumption, stable zero point, and convenient parameter setting
4. Display cumulative flow rate in both directions, instantaneous flow rate, flow velocity, flow percentage, etc
5 bidirectional measurement system, capable of measuring forward flow and reverse flow
6 alarm functions: air traffic control, excitation, upper and lower limits of flow
7-frequency output 4-20mA signal, flow output, cumulative pulse output, RS485 output
8 adopts advanced manufacturing technology, with stable and excellent performance
9 output ports, all input ports are equipped with safety lightning protection
10 self adjustable, flow upper and lower limits can be set by oneself
11 small signal removal
12 adopts efficient and high stability PWM wave excitation constant current source
13 damping coefficient optional
Long term storage of data after 14 short circuits
15 professional designs 4-6 multi electrode structures, further ensuring measurement accuracy and eliminating the need for grounding rings at all times, reducing instrument volume and installation and maintenance troubles.
The measurement of flow rate with a 16 meter coefficient 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.
ZNLD seriesSmall caliber (small flow) electromagnetic flowmeterMain technical performance:
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, etc., or according to user requirements (any connection shall comply with relevant standards in the petroleum industry)
Protection level: Standard type: IP65 (anti spray type); IP68 (submersible type)
Output signal: 4-20mAd.c., 0~1KHz
Flow display function: 1. Free switching between Chinese and English menus, with wide and high-definition LCD backlight display. Display cumulative flow rate, instantaneous flow rate, flow velocity, flow percentage, etc. in both forward and reverse directions.
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
ZNLD seriesConfirmation of the range of small caliber (small flow) electromagnetic flowmeter. Generally, the flow velocity of the measured medium in industrial use should be 2-4m/s. In special circumstances, the minimum flow velocity 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.
ZNLD seriesSmall caliber (small flow) electromagnetic flowmeterSelection Table:
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model |
caliber |
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ZNLD |
15~2600 |
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|
|
code |
Installation form |
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Y |
Integrated |
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F |
split type |
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|
code |
Converter model |
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ZA |
rotundity |
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ZB |
square |
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|
code |
output signal |
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I.4 |
4~20mA |
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f |
Frequency 1KHz |
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Rs |
Serial communication (485) |
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C |
control output |
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|
code |
Explosion proof requirements |
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N |
No explosion-proof |
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EX |
Explosion proof (only applicable to split type) |
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|
code |
medium temperature |
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|
T1 |
≤65℃ |
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T2 |
≤120℃ |
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T3 |
≤ 180 ℃ (only applicable to split type) |
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|
code |
Lining material |
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NE |
Chloroprene rubber (≤ 65 ℃) |
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PTFE |
Polytetrafluoroethylene (≤ 189 ℃) |
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PVC |
Polyvinyl chloride (≤ 70 ℃) |
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|
code |
Electrode material |
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316L |
stainless steel |
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HC |
Hastelloy C |
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HB |
Hastelloy B |
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Ti |
titanium |
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Ta |
tantalum |
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ZNLD seriesSmall caliber (small flow) electromagnetic flowmeterHow to install on pipelines:
It should be installed at the lower and vertically upward positions of the horizontal pipeline, avoiding installation at the highest point and vertically downward position of the pipeline;
Should be installed at the rising point on the pipeline;
When installing an open discharge pipeline, it should be installed at the lower part of the pipeline;
If the pipeline drop exceeds 5m, install an exhaust valve downstream of the sensor;
Control valves and shut-off valves should be installed downstream of the sensor, rather than upstream of the sensor;
Sensors should never be installed at the inlet and outlet of the pump, but rather at the outlet of the pump;
Method of installing flow meters in measuring wells
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1. Entrance
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2. Overflow pipe
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3. Entrance barrier
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4. Cleaning hole
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5. Flow meter
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6. Short tube
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7. Export
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8. Discharge valve
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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 completely filled with liquid;
·There should be a minimum of 5 * D (D is the inner diameter of the flow meter) straight pipe section in front of the flow meter, and a minimum of 3 * D (D is the inner diameter of the flow meter) straight pipe section behind it;
·The flow direction of the fluid is consistent with 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 flowmeter;
·There should be ample space near the 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 is the inner diameter of the flowmeter). To facilitate the cleaning and maintenance of the flowmeter in the future, a bypass pipeline should be installed;
·The flow direction of the fluid is consistent with 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 flowmeter;
·There should be ample space near the 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 is the inner diameter of the flowmeter). To facilitate the cleaning and maintenance of the flowmeter in the future, a bypass pipeline should be installed;
Electromagnetic flowmeter - Intelligent electromagnetic flowmeter
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