Remote type electromagnetic flowmeter
Remote type electromagnetic flowmeter is mainly used to measure the volume flow of conductive liquid and slurry in closed pipe. Including acid, alkali, salt and other corrosive liquids. The products are widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, papermaking and other industries as well as environmental protection, municipal management, water conservancy construction and other fields.
Electromagnetic flowmeter according to the converter and sensor assembly classification, there are split type and one type.
Remote type electromagnetic flowmeter is the most commonly used form of electromagnetic flowmeter, as shown in Figure 1 below. The sensor is connected to the pipeline, and the converter is installed in the instrument room or near the sensor that is easily accessible to people, separated by tens to hundreds of meters.
In order to prevent the intrusion of external noise, the signal cable usually adopts double core shielded wire. When measuring liquid with low conductivity and gathering over 30m, in order to prevent signal attenuation caused by part of cable capacitance, the inner shielding is also required to be connected to a low impedance source with the same potential as the core wire. The converter of split type electromagnetic flowmeter can be far away from the harsh environment on site, and it is convenient to check, adjust and set parameters of electronic components.
Measuring principle of Remote type electromagnetic flowmeter
Remote type electromagnetic flowmeter measuring principle is based on Faraday electromagnetic induction law, split type electromagnetic flowmeter is composed of a sensor and a converter, the sensor is installed in the measurement pipeline, the converter is installed within 30 meters or 100 meters from the sensor, the two are connected by a shielded cable.
The main components of the Remote type electromagnetic flowmeter sensor are: measuring tube, electrode, excitation coil, iron core and magnetic yoke shell. It is mainly used to measure the volume flow of conductive liquid and grout in closed pipes. Such as water, sewage, mud, pulp, all kinds of acid, alkali, salt solution, food slurry, widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, papermaking and other industries as well as environmental protection, municipal management, water conservancy construction and other fields measurement of high temperature, high humidity, inconvenient to observe the environment.
Product features of
Remote type electromagnetic flowmeter
1, the measurement is not affected by fluid density, viscosity, temperature, pressure and conductivity changes;
2. No blocking flow parts in the measuring tube, no pressure loss, and lower requirements for straight pipe section;
3, series nominal diameter DN15 ~ DN3000. There are many choices of sensor linings and electrode materials;
4, the converter adopts novel excitation mode, low power consumption, zero stability, high accuracy. Flow range up to 1500:1;
5, converter and sensor can be composed of a body or separate type;
6, converter adopts 16-bit high-performance microprocessor, 2x16LCD display, convenient parameter setting, reliable programming;
7, the flowmeter is a two-way measurement system, equipped with three integrators: forward total, reverse total and difference total; It can display. Chuang, reverse flow, and has a variety of outputs: electricity
Flow, pulse, digital communication, HART;
8, the converter adopts SMT, with self-test and self-diagnosis function
9. It is suitable for the volume flow measurement of conductive fluid whose conductivity is greater than 5 (dic1) s/cm
10, measuring tube without moving and flow blocking parts, small pressure loss
11. Lining and electrode with different materials have good corrosion resistance
12, not affected by medium, density, viscosity, temperature, pressure and conductivity
Low frequency rectangular wave excitation, not easy to be disturbed, stable and reliable
14, converter low energy consumption, simple and convenient installation, users do not need to debug
Technical parameters of Remote type electromagnetic flowmeter
Accuracy: ±0.5%, ±1%
Lining material: polyurethane, neoprene, ptfe, etc
Electrode material: stainless steel, Hastelloy, titanium, platinum-iridium alloy, etc
Connection mode: flange clamping, flange connection, etc
Medium temperature: 0℃ ~ 70℃, 0℃ ~ 130℃ (0℃ ~ 180℃)
Nominal pressure: 1.0Mpa to 32 Mpa
Protection grade: IP65, IP68
Explosion-proof mark: ExibBT4
Operating voltage: 220VAC, 24VDC
The installation conditions
The upstream straight pipe is larger than 10 x DN
The downstream straight pipe is larger than 5 x DN
DN= Sensor nominal caliber
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Model
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LDG LDE LDCK
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Size
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DN10〜DN1800
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Material
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PTFE, Soft rubber, Hard rubber, F46, FS, PUR.
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Electrode
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316L, Hastelloy C, Hastelloy B, Titanium, Tantalum, etc.
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Accuracy
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0.3% (Option), 0.5%, 1.0% of F.S..
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Output
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4-20ma
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Communication
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RS-232; RS-485; HART
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