Electromagnetic flow meters measure the volumetric flow of conductive liquids in closed pipes. Electromagnetic water flow meters are the preferred process water flow meter. Most industrial water supply pipes (1-inch, 3-inch, etc.) require online flow measurement. They display instantaneous flow in real time, provide totalizer flow, and support pulse, 4-20mA, and RS485 signal outputs.
Electromagnetic digital flow meters are suitable for: domestic water, industrial water, raw water, ground water, urban sewage, industrial wastewater, pulp slurry, and more.
| Diameter | DN6~DN3000mm |
| Accuracy | ±0.5% |
| Flow rate | 0.3~15m/s |
| Electrode | 316L (Suitable for domestic water, industrial water, raw water, underground water, sewage, etc.; not applicable to acid and alkali salt) |
| Lining material | Chloroprene rubber(CR), polyurethane rubber(PU), PTFE(F4) |
Digital Electromagnetic Water Flow Meter Features
Electromagnetic Water Flow Meter Specifications
| Main power | AC220V 50HZ / DC24V | |
| Power consumption | < 15W (And set with sensor supporting power consumption ) | |
| Display and push buttons | Can display the instantaneous flow, total flow and percentage of flow as well as alarm display, four thin-film touch nubs, which is used to data set. | |
| Accumulator | Forward total quantity, reverse total quantity | |
| Output signal | Analog output | Bi-direction with two ways, Isolation 0-10mA/4-20mA |
| Load resistor: 0-10mA; 0-1.5KΩ; 4-20mA; 0-750Ω | ||
| Frequency output | Forward & reverse flow output with frequency range set between 1-5000Hz.The external voltage must be lower than 35V and the max output and the max output current is 50mA when the transistor is turned on | |
| Alarm output | Two outputs from the collectors of photoelectric isolate transistors are for alarm signals. The external voltage must be lower than 35V and the max output current is 250mA when the transistor is turned on. Alarm status: Activates when the measured pipes are empty, the excitation circuits are broken or the volume of flow rate exceeds the value designed limits. | |
| Pulse output | For pulse output in forward and reverse flow measurement, upper frequency of pulse output can be up to 5000 CP/S relevant value of pulse is from 0.0001 to 1.0 M3/P. The width of pulse can be set to 20ms or squired wave from automatically. The collector of transistor with photoelectric is open circuited. The external voltage must be lower than 35 V and maximum output current is 250mA when the transistor is turned on. | |
| Accuracy | ±0.5% of the value displayed, ±0.3% or ±0.2% optional. | |
| Damping time constant | Continuous variable from 0-100 s (90%)can be selected by group | |
| Communication | RS232 ,RS485 or HART Communication are optional,with lighting resistance | |
| Power failure | An anti-failure clock is designed in the flow meter which can save the power failure records for 16 times (10 years) | |
| Nominal diameter | DN6~DN3000mm | |
| Nominal Pressure | 0.6~4.0MPa | |
| Main power | AC220V 50Hz /DC24V/3.6V | |
| Accuracy | ±0.5%, ±0.3% or ±0.2% are optional | |
| Output signal | Analog output, Frequency output, Alarm output, Pulse output | |
| Liner material | Neoprene, Urethane Rubber, Polysilicone Rubber, PTFE, F46, PFA | |
| Electrode Type | General type, scraper type and replaceable type | |
| Electrode material | SUS316, Hastelloy B, Hastelloy C, Titanium, Tantalum, Platinum-iridium alloy, Stainless steelcovered with tungsten carbide | |
| Medium temperature | -20ºC~+70ºC | |
| Ambient Temperature | -25ºC ~ +60ºC | |
| Ambient Humidity | 5~100%RH(relative humidity) | |
| Medium Electrical conductivity | ≥20us/cm | |
| Measuring Range | 1500:1,flow rate <15m/s | |
| Structure type | Integral type, remote type, submersible type, ex-proof type <15m/s | |
| Protection Class | IP65, IP67, IP68(optional) | |
Electromagnetic Water Flow Meter Applications
Electromagnetic flowmeters are widely used in the water industry, especially in sewage treatment and other fields. As long as the conductivity of the medium is greater than 5μs/cm.
If there are many liquids with suspended particles, Electromagnetic water flow mete is also suitable. For example, sewage, wastewater, chemicals, mud, etc.
SI-3101 Magnetic flow meter is suitable for water flow measurement, like:
Domestic water, industrial water, raw water, ground water, urban sewage, industrial wastewater, the processed neutral pulp, pulp slurry, etc.
Order Guide
| SI-3101- | Note | ||||||||||||
| Diameter | DNXX | DN6~DN3000(mm) | |||||||||||
| Structure | F | Remote type (standard with 10m cable) | |||||||||||
| Y | Compact type | ||||||||||||
| Electrode | S | 316L | |||||||||||
| T | Titanium(Ti) | ||||||||||||
| D | Tantalum(Ta) | ||||||||||||
| C | Hastalloy C(HC) | ||||||||||||
| P | Platinum iridium alloy | ||||||||||||
| Lining material | X | Chloroprene rubber (CR) Suitable for tap water, | |||||||||||
| J | Polyurethane rubber (PU) Suitable for pulp, pulp, etc liquid | ||||||||||||
| E | Polytetrafluoroethylene (PTFE) | ||||||||||||
| A | PFA | ||||||||||||
| Body material | CS | Carbon steel | |||||||||||
| S4 | SUS304 | ||||||||||||
| Protection class | L0 | IP65(compact type) | |||||||||||
| L1 | IP67(remote type) | ||||||||||||
| L2 | IP68(remote type) | ||||||||||||
| Power supply | 1 | 110~240V AC | |||||||||||
| 2 | 24V DC | ||||||||||||
| 3 | Lithium battery(no signal output) | ||||||||||||
| Signal output | N | No output | |||||||||||
| N1 | 4-20m/pulse output | ||||||||||||
| Communication | H | HART protocol | |||||||||||
| R1 | MODBUS RS485 | ||||||||||||
| G | GPRS | ||||||||||||
| With grounding ring | 0 | Without grounding ring | |||||||||||
| 1 | With grounding ring | ||||||||||||
| Nominal pressure | D1 | DIN PN16 | |||||||||||
| D2 | DIN PN25 | ||||||||||||
| D3 | DIN PN40 | ||||||||||||
| D4 | DIN PN63 | ||||||||||||
| J1 | JIS 10K | ||||||||||||
| J2 | JIS 20K | ||||||||||||
| J3 | JIS 40K | ||||||||||||
| A1 | ANSI Class150 | ||||||||||||
| A2 | ANSI Class300 | ||||||||||||
| A3 | ANSI Class600 | ||||||||||||
| O | Others | ||||||||||||
| Cable length | /xx | Unit: m | |||||||||||
Magnetic flow meters use the principle of Faraday’s Law of Electromagnetic Induction to measure the flow rate of liquid in a pipe. In the magnetic flowmeter pipe parts, a magnetic field is generated, and channeled into the liquid flowing through the pipe. Faraday’s Law states that the voltage generated is proportional to the movement of the flowing liquid. A conductor moving through a magnetic field produces an electric signal within the conductor. And the signal is proportional to the velocity of the water moving through the field.
As fluid flows through the magnetic field, conductive particles in the fluid create changes. This variation is used to measure and calculate the velocity of water flow through the pipe. When the fluid moves faster, more voltage is generated. The electronic transmitter processes the voltage signal to determine liquid flow.
Electromagnetic flow meter Working Principle
The operation principle of a magnetic flow meter or mag meter is based upon Faraday’s Law. Faraday’s Law states the voltage generated is proportional to the movement of the flowing liquid. The transmitter processes the voltage signal to determine liquid flow.
To apply this principle to flow measurement with a magnetic flow meter. First is to state that the fluid being measured must be electrically conductive for the Faraday principle to apply.
As applied to the design of magnetic flow meters, Faraday’s Law indicates that:
the signal voltage (E) is dependent on V, B, D.
V is the average liquid velocity ;
B is the magnetic field strength ;
D is the length of the conductor ( which in this instance is the distance between the electrodes).
Read more about: Magnetic Flowmeter Technology
Advantages of electromagnetic flowmeter
- The flow barrier of the Electromagnetic water flow meter is almost zero. Therefore this type of meter can be used to measure heavy suspensions. Including mud, sewage and wood pulp.
- Except for the straight tube length used by the Electromagnetic water flow meter, this flow meter has no head loss.
- Electromagnetic water flow meter is not greatly affected by upstream flow disturbance.
- Electromagnetic water flow meter is virtually unaffected by changes in density, viscosity, pressure, and temperature.
- Power requirements may be low (15 or 20 W), especially for pulsed DC types.
- Electromagnetic water flow meter can be used as a two-way meter.
- Electromagnetic water flow meter is suitable for most acids, alkalis, water and aqueous solutions. Because the selected lining material is not only a good electrical insulator, but also has corrosion resistance.
- Electromagnetic water flow meter is widely used in mud services. Not only because they are less blocking. And because some linings (such as polyurethane, neoprene, and rubber) have good abrasion or corrosion resistance.
- Electromagnetic water flow meter can handle extremely low flow.
Disadvantages of electromagnetic flowmeter
- Electromagnetic water flow meter can only be used for fluids with proper conductivity.
- The accuracy is only within the range of ± 1% within the flow range of 5%.
- The size and cost of the excitation coil and circuit increase disproportionately to the size of the tube hole. Therefore, the small-sized Electromagnetic water flow meter is bulky and expensive.
1.Installation location
Avoid the magnetic objects and equipment with strong electromagnetic field; should install the flow meter at ventilated location;
Avoid the location where ambient temperature above 50ºC and relative humidity above 90%;
The water flowmeter should be installed at somewhere spacious;
The Digital Electromagnetic Water Flow Meter with RS485 Signal should be installed behind pump and the value should install at downstream.
2.Installa the flow sensor
Must to ensure the pipeline is fulled and without bubbles to keep the high accuracy;
The flow direction shoudl keep with sign on the body of flowmeter;
Ensure the double electrodes keep Horizontal;
If the medium is mixed by liquid and solid,Pls installa it at vertical to extend the working life of lining;
If the environment with shocked pls installa the bracket at both front and behind;
If the medium is pollution liquid,should installa the flow meter at bypass pipe and don’t interrupted when you on service;
3.Requirement of Straight pipe
The straight of pipe at inlet must more than 10×DN,Suggest 15DN; at outlet, the straight pipe at least 5×DN;
If at the upstream of flowmeter, there are values, elbow, the straight must need 15×DN;
Please install the shut-off value at both front and behind of flow meter;
4.Installation advance
The installation location for you reference.
Technical Support
Wastewater flow meter
Wastewater Flow meters are flowmeters for water and wastewater treatment. Electromagnetic flow meters are suitable for open channel and underground industrial water pipes.
Potable Water
Potable water flow meter also called Drinking water. Potable water flow meters are important for Domestic industries. Accurate flow measurement is essential to cost-conscious drinking water and potable water system.
Digital Water Flow Meter
Digital water flow meter, is the electronic flow meter, which display the flow rate of water. Different Industrial liquid, different pipe for 1 inch, 2 inch, use different flow meters
Cooling Water
The cooling water flow meter is used to measure the cooling water flow rate. Cooling water flow meters are commonly used in cooling water towers, circulation systems, pipes, tanks, and pumps.
FAQ
More Water Flow Meters
Electromagnetic water flow meters have a wide range of applications.
Large-diameter meters are commonly used in water supply and drainage projects, while small and medium-diameter meters are often used in demanding or difficult-to-measure applications. Examples include controlling blast furnace tuyere cooling water in the steel industry, measuring pulp and black liquor in the paper industry, measuring highly corrosive liquids in the chemical industry, and measuring ore slurries in the nonferrous metallurgy industry.
Small-diameter and micro-diameter electromagnetic water flow meters are often used in hygiene-critical environments such as the pharmaceutical, food, and biochemical industries.
Sino-Inst offers customizable electromagnetic water flow meters. Feel free to contact our sales engineers for customized solutions!