Guided wave radar level meter in the application of the material level measurement

The material level is an important parameter in industrial production, there are many ways to measure the liquid level of according to the different condition and medium can use different measurement principle of liquid level meter. Blowing method, differential pressure type, ball float, capacitance method, ultrasonic and other commonly used liquid level measuring instrument has its own characteristics and application scope. Guided wave radar level gauge ( 导波雷达,吉尼斯世界纪录) Due to radar measurement with the advanced technology, the measurement is not affected by medium, temperature, inert gas, steam and dust and bubble, measuring the length of the flexible change, measurement accuracy is higher, so the liquid level measurement plays an increasingly important role. 1. Measuring principle of guided wave radar level gauge, GWR is based on time domain reflection principle on the basis of radar level gauge. Radar level gauge of electromagnetic pulse to the speed of light along a waveguide ( The probe) Downward transmission, when the surface of the measured medium, part of the pulse is reflected echo and the other path to return to the pulse transmitters, walk called high-speed timing circuit ( Electronic meter) Accurately measure the pulse wave transmission time, and transmitting device and the surface of the measured medium is proportional to the distance with the conduction time, liquid level height can be obtained by calculation. Emission of electromagnetic pulse transmitters signals reach the surface of the medium and returns, the signal attenuation. At this point, the signal intensity is proportional to the dielectric constant of medium, the dielectric constant, the greater the reflection signal is stronger; On the other hand, the reflected signal is weak. At present, Magnetrol company GWR can be used for measuring ZUI low dielectric constant of 1. 4 the medium level. In addition, the high conductivity medium ( Such as water) Produce the strong reflection pulse; And low electrical conductivity medium ( Such as hydrocarbon) A weak reflection impulse, low conductive medium can make some electromagnetic waves along the probe, Waveguide body) Through the liquid to spread, until completely depart or be a high conductivity of medium to bounce back. According to the characteristics of interface (GWR measuring two liquids can be used Such as oil/water interface) On condition that the interface of liquid dielectric constant should be greater than the interface of dielectric constant. 2. Guided wave radar level gauge of GWR mainly includes the level gauge electronic meter, process connection and probes three sections, as shown in figure 1. Among them, the process connection including two, flange connection and screw thread connection flange connection as shown in figure 1. GWR containers and tanks, most suitable for measuring the process connection container and the bypass container level, measuring the temperature and pressure limits in the range of temperature and pressure rating of the probe. Magnetrol company GWR applicable medium temperature can reach 400 ℃, the pressure can be up to 34. 45Pa( 5000psig) 。 In addition, if the process temperature is too high, also can be GWR bypass tube in a container, it would play a cooling effect. 3. GWR probe and the bypass pipe 3. 1 probe in the practical application, GWR probe selection is very important. Probes are coaxial type, double pole type ( Hard line or soft spring) And the single lever ( Hard line or soft spring) Three kinds of 67, as shown in figure 2. Coaxial probe is ZUI probe configuration of all effective, and should first consider using in all applications, but this kind of probe length should be controlled within 5 m, otherwise is not convenient to transport and install, In general, if the measuring range, more than 3 m soft cable type probe) is recommended to be used 。 If the fluid have larger fluctuation, recommend the use of coaxial probe and hard bar type probe, because they have a certain extent; If fluctuations or measuring range is too big must probe with a soft cable type, in order to probe outside plus protective casing. It is important to note that the process of signal transmission in order to ensure the obstacles of interference, in addition to the coaxial probe, other types of space probe has certain requirements. Due to probe a dead zone, size and measurement of the die is inversely proportional to the dielectric constant of the medium. If the dielectric constant of measured medium, the greater the dead zone of the measurement is smaller; On the other hand, the greater the dead zone. To the products of different manufacturers, size has the difference, the dead Magnetrol company probe dead zone in the range of 25 to 150 mm. When determining the length of the probe need to take into consideration of the dead area size, should ensure that the probe can be inserted into the ZUI under the low level of a certain distance. Magnetrol company of GWR in ZUI low liquid level measurement, the probe length should be selected to ensure that the probe can be inserted into the liquid level under 25 to 150 mm. 3. 2 GWR bypass pipe in liquid level measurement, GWR can be directly inserted into the device, or installed in the bypass pipe. The bypass pipe provided by the piping department or GWR suppliers. The bypass pipe and connection of probe should be depending on the connection of probe and decide, can be a flange connection, also can be threaded connections. As shown in figure 3 as GWR bypass pipe.
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