是一种微波物位计，它是微波(雷达)定位技术的一种运用。 Guided wave radar level gauge is a microwave level gauge, which is an application of microwave (radar) positioning technology. It transmits energy waves through a device that can transmit energy waves (generally pulse signals). The energy waves are transmitted in the waveguide. The energy waves are reflected by obstacles. The reflected energy waves are transmitted by the waveguide to the receiving device. The receiving device receives the reflected signal. The change in level is determined according to the time difference of the measured energy wave motion process. Microwave signal is processed by the electronic device, into electrical signals associated with the final position thereof. The energy radiation level is low. The energy wave used by this device is a pulse energy wave (the frequency is generally lower than that of a smart radar level meter). Generally, the maximum pulse energy of the pulse energy wave is about 1mW (average power is about 1μW), which will not cause radiation damage to other equipment and personnel.
适用范围及特点：导波微波物位仪表用于对液体、浆料及颗粒料等介电常数比较小的介质的进行接触连续测量，适用于温度、压力变化大、有惰性气体或蒸汽存在的场合。 Guided wave radar level meter application scope and characteristics: Guided wave microwave level meter is used for continuous measurement of mediums with relatively small dielectric constants such as liquids, slurries and particles. It is suitable for temperature, pressure changes, Where inert gas or steam is present. Has the following characteristics 1, strong versatility: can measure liquid level and material level, can meet the measurement requirements of different temperatures, pressures, media, the highest measurement temperature can reach 800 ℃, the maximum pressure can reach 5MPa, and can be used for corrosion, impact And other bad occasions. 2. Anti-hanging material: The unique circuit design and sensor structure make its measurement not affected by the hanging material of the sensor, without regular cleaning and avoiding false measurement. 3. Maintenance-free: There are no moving parts in the measurement process, there is no problem of damage to mechanical parts, and no maintenance is required. 4, anti-interference: contact measurement, strong anti-interference ability, can overcome the influence of steam, foam and stirring on the measurement. 5. Accurate and reliable: The measurement quantity is diversified, making the measurement more accurate, the measurement is not affected by environmental changes, the stability is high, and the service life is long.
Guided wave radar level meter main technical parameter measurement range: 0 --- 6 meters, cable type up to 35 meters;
Process connection: thread or flange;
Process temperature: -40 -250 ℃;
Process pressure: -1.0- 60 bar;
Working frequency: 1.8GHz;
Response speed: ≥0.2s (depending on the specific situation)
Repeatability: ± 3mm;
Current signal: 4 ～ 20mA / HART;
Communication interface: HART communication protocol;
Power: 24V DC (+/- 10%) / Ripple voltage: 1Vpp;
Power consumption: max22.5mA;
Explosion-proof certification: Exia II CT6;
Enclosure protection level: IP68;
Two-wire wiring: One two-core wire for power supply and signal output;
Cable entry: two M201.5 (cable diameter 5… 9mm).
分类根据检测雷达反射波的方式不同，分为调频连续雷达和脉冲雷达。 Guided wave radar level gauge classification is divided into FM continuous radar and pulse radar according to the different ways of detecting radar reflected waves. 1. The operating frequency of FM continuous wave radar is 8 ~ 26GHZ. The transmitting frequency changes according to a certain rule during the transmitting process. The radar detects the time difference between radar waves of different frequencies to determine the liquid level position. The shape of the antenna is mostly a horn or a rod, which Non-contact measurement. 2. The working frequency of the pulse radar is 100MHZ ~ 6.3GHZ, the transmission frequency is unchanged, and it is transmitted at a certain time interval. The radar detects the time difference between the two radar waves to determine the liquid level position. Antennas come in horn, rod, and cable types, which can be measured with or without contact. Because the two frequencies are different, they are also distinguished by high-frequency radar and low-frequency radar, rather than determined by the shape of the antenna.