The intelligent electromagnetic flowmeter
The intelligent electromagnetic flowmeterIs one meter in jiangsu according to the law of farad elect…
Description：
An overview,
The intelligent electromagnetic flowmeterIs one meter in jiangsu according to the law of farad electromagnetic induction to the measuring tube conducting medium volume flow sensing instrument, MCU embedded technology, digital excitation, at the same time in the electromagnetic flow meter adopting CAN field bus, at first, the technology to meet the domestic leading level.The intelligent electromagnetic flowmeterAccording to the scene of the meet at the same time, also can output 4 ~ 20 ma current signal for records, adjust and control, has been widely used in chemical industry, environmental protection, metallurgy, medicine, paper making, water supply and drainage and other industrial technology and management.Electromagnetic flowmeter in addition to the general conductive liquid flow can be measured, can also be measured liquid-solid two phase flow, high viscosity fluid and salt, strong acid, strong alkali liquid volume flow.
Second, the characteristics of
Low instrument structure is simple, reliable, and have no moving parts, long working life.
No closure choke parts, there is no pressure loss and flow blocking phenomenon.
No mechanical inertia, rapid response, good stability and can be applied to automatic testing, adjusting and SPC system.
Low measurement precision is not affected by the type of measured medium and its temperature, viscosity, density, pressure and other physical parameters.
Use teflon or rubber lining with HC, HB, 316 l, the different combination of electrode materials such as Ti can adapt to the needs of different medium.
Low with pipeline, plug-in, such as a variety of flow meter type.
No closure choke parts, there is no pressure loss and flow blocking phenomenon.
No mechanical inertia, rapid response, good stability and can be applied to automatic testing, adjusting and SPC system.
Low measurement precision is not affected by the type of measured medium and its temperature, viscosity, density, pressure and other physical parameters.
Use teflon or rubber lining with HC, HB, 316 l, the different combination of electrode materials such as Ti can adapt to the needs of different medium.
Low with pipeline, plug-in, such as a variety of flow meter type.
Low block using EEPROM memory, measuring operational data storage safe and reliable protection.
Low type with integration and separation of two forms.
Low high-definition LCD backlit display.
Low type with integration and separation of two forms.
Low high-definition LCD backlit display.
Three, technical parameters
| Suitable diameter | DN15mm－2600mm | |
| Electrode materials | 316 l (stainless steel), HC hartz (C), HB (hartz B), Ti (Ti), Ta (Ta) | |
| Applicable medium | Liquid conductivity > 5 us/cm | |
| Measuring range | 0.1 ~ 10 m/s (can be extended to 15 m/s) | |
| Maximum range | 0.5 ~ 10 m/s, recommend 1 ~ 5 m/s | |
| Precision grade | 0.3, 0.5, 1.0 (with diameter distinguish) | |
| The output signal | 4 ~ 20 madc, load 750 Ω or less;0 ~ 3 KHZ, 5 v active, variable pulse width, high effective frequency output: RS485 interface | |
| Pressure of work | 1.0 MPa, 1.6 MPa, 1.0 MPa, 16 MPa (special) | |
| The fluid temperature | - 20 ℃ ~ 80 ℃, 80 ℃ ~ 130 ℃, 130 ℃ ~ 180 ℃ reference lining material | |
| The environment temperature | Sensors - 40 ℃ ~ 80 ℃;Converter to 15 ℃ to 50 ℃ | |
| The environment temperature | 85% RH or less (20 ℃) | |
| Cable outlet size | M20×1.5 | |
| Power supply | 220VAC±10%;50Hz±1Hz;24VDC±10% | |
| Power consumption | ≤8Ｗ | |
| Enclosure protection class | One-piece: IP65 split type: sensor IP6 IP68 converter | |
| Grounding ring material | 1 cr18ni9ti (stainless steel), HC hartz (C), Ti (Ti), Ta (tantalum), Cu (copper) | |
| Connecting flange | Gb GB9119-88 (DIN2051 BS4504) http://www.zgyb18.com/index.html | |
Four, principle of work
The intelligent electromagnetic flowmeterIn the measurement principle is based on Faraday's law of electromagnetic induction instrument automation.Flowmeter measurement tube is a lining insulation not short magnetic alloy pipe.Two electrodes along diameter direction through wall is fixed on the measuring tube.The electrode head and basic flush lining the inner surface.The bi-directional under square wave pulse magnetic field coil, will be in a direction perpendicular to the measuring tube axis to produce a magnetic field of magnetic flux density of B work.At this point, if a certain electrical conductivity of liquid flowing through the measuring tube, will cut magnetic induction electromotive force E.Electromotive force E is proportional to the magnetic flux density B, sounding pipe diameter d, and V is the product of the average flow.Electromotive force E (traffic signal) by the detection electrode and through the cable to the converter.Converter will flow signal amplification processing, can display the fluid flow, and can output pulse, analog signals, such as current used for flow control and regulation.
E＝KBdV
Type: the E -- -- as the electrode signal voltage (V)
B -- - magnetic flux density (T)
D - tube inner diameter measurement (m)
V -- - the average flow velocity (m/s)
Type of K, d is constant, due to the exciting current is constant current, therefore, B is constant, by E = KBdV, volume flow rate Q is proportional to the signal voltage E, the velocity of the induction signal voltage E and a linear relationship with the volume flow rate Q.Therefore, as long as the measured E can determine the flow Q, this is the basic working principle of electromagnetic flowmeter.
By E = KBdV knowable, the medium of the flow temperature, density, pressure, conductivity, liquid-solid two-phase fluid parameters such as composition of liquid-solid ratio does not affect the measurement result.As for flow state should accord with axisymmetric flow (e.g., laminar or turbulent) will not affect the measurement result.So say electromagnetic flowmeter is a kind of volume flowmeter.For manufacturers and users, as long as the actual calibration with ordinary water can be measured after any other conductive fluid volume, and does not need to make any correction, this is a prominent advantages of electromagnetic flowmeter, is don't have any other flowmeter.The measuring tube without activity and choke components, so almost no pressure loss, and has high reliability.
Type: the E -- -- as the electrode signal voltage (V)
B -- - magnetic flux density (T)
D - tube inner diameter measurement (m)
V -- - the average flow velocity (m/s)
Type of K, d is constant, due to the exciting current is constant current, therefore, B is constant, by E = KBdV, volume flow rate Q is proportional to the signal voltage E, the velocity of the induction signal voltage E and a linear relationship with the volume flow rate Q.Therefore, as long as the measured E can determine the flow Q, this is the basic working principle of electromagnetic flowmeter.
By E = KBdV knowable, the medium of the flow temperature, density, pressure, conductivity, liquid-solid two-phase fluid parameters such as composition of liquid-solid ratio does not affect the measurement result.As for flow state should accord with axisymmetric flow (e.g., laminar or turbulent) will not affect the measurement result.So say electromagnetic flowmeter is a kind of volume flowmeter.For manufacturers and users, as long as the actual calibration with ordinary water can be measured after any other conductive fluid volume, and does not need to make any correction, this is a prominent advantages of electromagnetic flowmeter, is don't have any other flowmeter.The measuring tube without activity and choke components, so almost no pressure loss, and has high reliability.
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