Mag Meter Flow Meter and ultrasonic flowmeter these two comparable flowmeter, through the principle of measurement and technical parameters of the comparison and analysis, to elaborate on the selection of some of the places should pay attention to.

Electromagnetic Flow Meter vs Ultrasonic Flow Meter: working principle is different

1. Mag Meter Flow Meter

Mag Meter Flow Meter measurement principle is based on Faraday's law of electromagnetic induction, conductor movement in the magnetic field will produce induced voltage. Electromagnetic flowmeter by alternating polarity switching DC I generate a constant alternating magnetic field, the magnetic field direction perpendicular to the direction of medium flow. Flow measurement, the medium flows through the magnetic field, the flow of the medium is equivalent to the movement of the conductor, induced with the medium flow rate is proportional to the electric potential.

B: magnetic induction strength

L: electrode spacing

v: media flow rate

Mag Meter Flow Meter through the two measuring electrodes to detect the induced electromotive force, transmitted to the converter processing, based on the measurement of pipeline cross-sectional area A can be calculated based on the volume flow rate of the fluid Q.

2. Ultrasonic flow meter

ultrasonic flow meter measurement principle based on the principle of measurement of the time-difference method, will be mounted on the opposite sides of the measuring tube two transducers respectively. The two sensors are installed in the measuring tube on opposite sides. Two sensors alternately transmit and receive ultrasonic signals, and at the same time measure the signal propagation time. When the fluid flows through the measuring tube, the signal propagation time is shortened in the downstream direction and lengthened in the counterflow direction. The two sensors measure the difference in signal propagation time, which is proportional to the flow rate.

Mag Meter Flow Meter vs Ultrasonic Flow Meter: classification is different

 1. Mag meter flow meter: subdivided into scenarios specialized customization

  - According to the structure: split type (converter and sensor separation), a body (integrated design, easy to install)

  - Connection: flange type, clamping type, sanitary (focusing on food and pharmaceutical industries), insertion type (low-cost transformation preferred), etc.

  - By function: explosion-proof (chemical high-risk scenarios), slurry (high solids content media), etc.

2. Ultrasonic flow meter: flexible configuration to cope with extreme working conditions

  - According to the sensor: external clamping (no hole installation, pipe network detection magic), insertion type (accuracy and convenience balance)

  - According to the host: wall-mounted (fixed monitoring), modular (system integration), portable (essential for mobile inspection), etc.

  - According to the measurement method: Z method (transmittance method, applicable to clean liquids), V method (reflection method, to deal with moderately turbid media), etc.

Mag Meter Flow Meter VS ultrasonic flowmeter what are the differences between

1. The media are different

ultrasonic flow meter can measure a variety of liquids and sewage flow, the measurement accuracy is almost independent of the measured fluid temperature, pressure, viscosity, density and other parameters of the impact of the solution to other types of instrumentation is difficult to measure the flow of highly corrosive, non-conductive, radioactive and flammable and explosive media flow measurement problems.

Electromagnetic flow meter can not measure the conductivity of the liquid is very low, such as petroleum products and organic solvents. And when the media conductivity changes, the accuracy of the electromagnetic flow meter has a certain impact. 

2. Accuracy of different

ultrasonic flow meter and electromagnetic flow meter measurement medium is different, ultrasonic is the use of acoustic waves, the frequency is very low, ultrasonic frequency of 20kHz-100kHz, electromagnetic flowmeter electromagnetic waves; ultrasonic restriction is relatively large, it is very easy to be subjected to the interference of other ferrous objects, and in addition to the frequency is low, attenuation, the measurement range is small, the application of the surface is relatively narrow.

3. Installation requirements are different

ultrasonic flow meter for large round and rectangular pipelines, and the principle of the pipe diameter is not limited. For large pipelines not only to bring convenience, can be considered in the case of real flow calibration can not be realized is the preferred option. Clamp transducer ultrasonic flow meter can be installed without stopping the cut-off pipe, as long as the existing pipeline outside the installation of the transducer can be; this is the ultrasonic flow meter in the industrial flow meter has a unique advantage, and therefore can be used for mobility (i.e., non-fixed point of fixed installations) measurements, applicable to the network flow conditions to assess the determination of the ultrasonic flow meter for the measurement of the flow of non-obstructed without additional pressure loss. Ultrasonic flow meter is mainly installed outside the pipe and insertion installation, simple and convenient, can be disassembled online, maintenance does not require process stop, does not affect production.

The installation and commissioning of Mag Meter Flow Meter is more complicated than other flow meters, and the requirements are more strict. In the installation of the transmitter, from the selection of the installation site to the specific installation and commissioning, must be strictly in accordance with the requirements of the product specification: the installation site can not have vibration, strong magnetic field; in the installation, must make the transmitter and the pipeline have good contact and good grounding; transmitter potential and the measured fluid equipotential; in use, it must be exhausted in the measurement tube of the gas retained, otherwise it will cause a large measurement error; Electromagnetic flow meter needs to be installed in the conductivity of the liquid conditions; and the general installation of electromagnetic flow meter must be cut off pipe installation. But the electromagnetic flow meter is characterized by high accuracy under qualified field conditions. Electromagnetic flowmeter disassembly, relative to the clamping type ultrasonic flow meter trouble, must require process stop.

Scenario-based Selection Guide: Accurate Matching of Needs

Mag meter flow meter, when you face:

✔ High accuracy measurement needs

✔ Conductive media (water, sewage, acid and alkali liquids, etc.)

✔ Fixed installation scenarios, willing to invest in higher costs for accuracy

Typical cases: in and out of the water measurement of sewage treatment plants, chemical reactor material monitoring, food processing plants (such as milk and other conductive media) flow monitoring

Ultrasonic flowmeter, when you need to

✔ Non Conductive media measurement (oil, ethanol, ultrapure water)

✔ Temporary monitoring or mobile inspection (external clamping type ready to be disassembled)

✔ Initial investment-sensitive projects (such as temporary works, pipe network census)

Typical cases: leakage detection of urban water supply pipe network, heat supply system heat media flow monitoring

Ultrasonic flow meter and electromagnetic flow meter have their own advantages in different environments. In the small cost of operation, the measurement accuracy requirements are not high, it is appropriate to use ultrasonic flowmeter; in the installation, maintenance of sufficient funds, the measurement accuracy requirements of high cases, more recommended electromagnetic flowmeter.

Hangzhou ARTang can configure the flow meter according to the actual conditions on site; no need to bother about the type of flow meter, get the flow monitoring service faster.