产品特点： Product features of explosion-proof electromagnetic flowmeter :
1. The measurement is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity;
2. There are no obstructing flow parts in the measuring tube, no pressure loss, and the requirements for straight pipe sections are low;
3. The nominal diameter of the series is DN15 ～ DN3000. Multiple choices for sensor liner and electrode materials;
4. The converter uses a novel excitation method, low power consumption, stable zero point and high accuracy. Flow range can reach 1500: 1;
5. The converter can be integrated or separated with the sensor;
6. The converter adopts a 16-bit high-performance microprocessor, 2x16 LCD display, convenient parameter setting and reliable programming;
7. The flow meter is a two-way measurement system with three totalizers: forward total, reverse total, and difference total; it can be displayed. Zhuang, anti-flow, and has a variety of outputs: electricity
Stream, pulse, digital communication, HART;
8. The converter uses surface-mount technology SMT, which has self-checking and self-diagnostic functions;
采用世界最新技术。 HD-LD series explosion-proof electromagnetic flowmeter uses the latest technology in the world. The use of constant-current low-frequency three-value rectangular wave or double-frequency rectangular wave excitation not only has the advantages of a rectangular wave magnetic field, but also overcomes the shortcomings of a sine wave magnetic field; it can also eliminate power supply voltage fluctuations, power supply frequency changes, and excitation coil impedance changes Error; and has excellent zero stability and is not affected by the interference of fluid noise. So it has the characteristics of high stability and high reliability. The measurement principle of the explosion-proof electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The explosion-proof electromagnetic flowmeter consists of a sensor and a converter. The sensor is installed on the measurement pipeline. The converter can be combined with the sensor and called an integrated electromagnetic flowmeter. The converter is installed within 30 meters or 100 meters from the sensor, and the two are connected by a shielded cable called a separate electromagnetic flowmeter. The main components of the explosion-proof electromagnetic flowmeter sensor are: measuring tube, electrode, excitation coil, iron core and yoke housing. Explosion-proof electromagnetic flow meters are mainly used to measure the volumetric flow of conductive liquids and slurries in closed pipes. Such as water, sewage, mud, pulp, various acids, alkalis, salt solutions, food slurry, etc., explosion-proof electromagnetic flowmeters are widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, papermaking and other industries, as well as environmental protection, municipal management, Water construction and other fields.
流量的测量不受流体的密度、粘度、温度、压力和电导率变化的影响，传感器感应电压信号与平均流速呈线性关系，因此测量精度高(0.3-0.5%)，量程比宽(1：1500)。 The flow measurement of explosion-proof electromagnetic flowmeters is not affected by changes in the density, viscosity, temperature, pressure, and conductivity of the fluid. The sensor's induced voltage signal has a linear relationship with the average flow rate, so the measurement accuracy is high (0.3-0.5%) and the range is wide. (1: 1500). Explosion-proof electromagnetic flowmeter has no obstruction in the measuring pipe, so there is no additional pressure loss, which has significant energy saving significance. There are no moving parts in the measuring pipe, so the explosion-proof electromagnetic flowmeter has a long life. Explosion-proof electromagnetic flowmeters require shorter straight pipe sections for easy installation. Reasonable selection of electrodes and lining materials can resist corrosion and wear. Explosion-proof electromagnetic flowmeter sensor can choose ip68 submersion type. It adopts a wide-temperature-point line-type LCD display with backlight. All displays are in Chinese. It has many functions and is easy to use. It is particularly convenient for users to use. Using this flow meter can reduce unnecessary trouble and errors. The explosion-proof electromagnetic flowmeter has a two-way measurement system, which can measure the forward and reverse flow.
Main technical performance of explosion-proof electromagnetic flowmeter
Measured fluid conductivity: ≥5 us / cm
Full-scale flow rate: 0.3m / s --- 12 m / s
Measurement error: ± 0.5% of indicated value
Ambient temperature: -25 ℃-+ 180 ℃
Rated working pressure (mpa): 4.0, 1.6, 1.0, 0.6 (customized greater than 4.0)
Installation and connection: According to flange standards such as gb9115-88, gb9116-88, gb9119-88, jb / t81-94, din, ansi, etc. or according to user requirements (you can connect according to the relevant standards of the petroleum industry)
Protection level: standard type: ip65 (waterproof type); ip68 (diving type)
Output signal: 4-20mad.c., 0 ~ 1khz
Flow display function of explosion-proof electromagnetic flowmeter: 1 Chinese and English menus can be switched freely, wide and high definition LCD backlight display. 2 Display forward and reverse cumulative flow, instantaneous flow, flow rate, flow percentage, etc.
Communication function: rs485 communication interface
Alarm: air management, excitation, flow limit
Short-term data protection time: not less than 10 years (no auxiliary power required)
Power supply: standard type: 220va.c.50hz; special type 24v.c.
Power consumption: 220va