Since since the advent of electromagnetic flowmeter, through continuously improve and perfect, because of its)
Simple structure, no moving parts and hinder the perturbation of the measured medium flow or throttling.
Suitable for all kinds of corrosive medium measurement.
Its measurement is not affected by the density of the fluid, temperature, pressure, viscosity, Reynolds number and in.
Just calibration water as experimental medium range than the big, high measurement accuracy, no mechanical inertia, responsive, measurable pulsating flow and rapid accumulation amount.
Strong adaptability and so on many other types of flowmeter do not have the advantages of the masses of users, is one of the instrument type widely widely in recent years.
Main body structure of the electromagnetic flowmeter is consisting of sensors and switches.
It is based on Faraday's law of electromagnetic induction, which is used to measure conductivity greater than 5 & mu;
S/cm, the volume flow of conducting liquid is a kind of measuring volume flow of conducting medium induction meter.
LDE type intelligent electromagnetic flowmeter is embellish instrument technology co. , LTD. Adopt the technology research and development of the intelligent electromagnetic flowmeter at home and abroad, the electromagnetic transducer in Chinese kernel and high-speed central processing unit.
Computing speed very fast, high precision, reliable performance measurement.
Converter circuit design using domestic technology, the input impedance of 1015 ohms, common mode rejection ratio is better than 100 db, for outside interference and 60 hz / 50 hz interference suppression ability is better than 90 db, can measure the lower conductivity of the fluid flow.
The sensor using non-uniform magnetic field technology and special magnetic circuit structure, magnetic field is stable and reliable, and narrow the volume, reduce the repetition, make small flow meter
Widely used in petroleum, chemical, metallurgical, textile, paper making, environmental protection, food and other industrial department and the municipal administration, water conservancy construction, river dredging in areas such as flow measurement.
According to the national standard GB4208 -
And domestic electrotechnical commission standard IEC529-84
76 the enclosure protection grade standards on electrician electrical products have the following several levels: a, IP65: to prevent water spray type, electromagnetic flowmeter sensor shell allows faucet from any direction of the electromagnetic flowmeter sensor of sensor water spray, water pressure in 30 kpa, water yield of 12.
5 l/S, a distance of 3 meters.
Second, IP67: electromagnetic flowmeter sensor can be used for a short period of time in the water.
Three, IP68: for diving -
Under certain pressure is suitable for the job in water or underground for a long time, the electromagnetic flowmeter sensor and display part of the separation, to make the split type electromagnetic flowmeter, but it must be emphasized protection grade requirements of electromagnetic flowmeter.
Protection grade should be according to actual condition to select, sensors installed under the ground, often by water flooded conditions should choose IP68, sensors installed in the above the ground should choose IP65, IP67.
Generally well the electromagnetic flowmeter protection grade reaches IP65, this level of protection is suitable for most of the working environment, score because the electromagnetic flow sensor and the signal processor, therefore, sensor has a big place in the flow meter, if electromagnetic flowmeter sensor protection grade reaches IP65, then its installation location must meet the following requirements: 1.
As far as possible to avoid the environment has a high concentration of corrosive gas;
The environment temperature in -
25 / -
10 ~ 50/60 ℃ range, a temperature shape structure is subject to electronic components, to a narrower range;
Within the scope of environmental relative humidity was 10% ~ 90%;
As far as possible to avoid direct sunlight;
Avoid rainwater leaching leaching, would not be submerged by water;
Electromagnetic flowmeter measurement of mixed phase flow, choose the place that does not cause phase separation;
When measuring the two-component liquid, avoid in has not yet been mixing downstream;
When measuring chemical reaction, in response to fully complete the section downstream;
As far as possible to avoid the measuring tube becomes negative pressure;
Choose small vibration, especially for a size instrument;
Avoid near a big motor, transformer, etc. , so as not to cause electromagnetic interference;
Easy to realize sensor separate grounding.
In this paper by embellish instrument technology co. , LTD.
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