Tank level measurement in the selection and installation of radar level gauge

1. Application of radar level gauge tank level measurement radar level gauge is mainly launch to measure the electromagnetic wave, electromagnetic wave from transmitting to receiving time and distance to the liquid surface is positive correlation, relational expression is as follows: H = ct / 2 radar level measurement also has two ways, including contact and non-contact. Relatively speaking, non-contact radar level gauge is not particularly complicated structure, easy to install, the stability in the process of use is high also, is not easily disturbed. And contact, you need to channel microwave medium, medium is commonly metal conductor, emitting wave will be propagated along a conductor. So, contact the radar level gauge measuring the basic is not restricted by external conditions, more suitable for the space is little, medium volatility is larger. Guided wave radar level gauge of wave length of the rod is also has certain rules, if too long, the installation will not convenient, later maintenance is more troublesome, on the contrary, installation and maintenance of radar level gauge is more convenient. Just mention the length of the wave guide rod it according to the operating mode is set, so are not interchangeable, and radar level meter can be used interchangeably. Wave guide rod stress is more complex, transportation and installation maintenance cost is high, so its measuring range is limited, and radar level meter can measure range is wide. Radar level gauge is now being gradually by people more and more perfect, because technology is increasingly mature. Radar level gauge is not vulnerable to outside interference factors, such as temperature, pressure, etc. , strong interchangeability, wide measuring range, so that its use in petrochemical projects over the past few years more and more widely. 2. Selection and installation of radar level gauge, 2. 1 in the selection of radar level gauge selection considerations radar level gauge is largely eye technology together, to comprehensively consider medium corrosion resistance and adhesion, and physical characteristics of medium, also includes the range of measurement and measurement to the error of the requirements, etc. The classification of radar level gauge is usually based on the frequency of high and low to distinguish, so there is low frequency and high frequency radar radar. Both have their own different characteristics and advantages, such as low frequency radar strong penetrating power, suitable for the place of application and conditions of the environment is bad; Instead of hf radar is its high frequency, it launched special strong signal, measurement error is small, its application is more suitable for the place with some dirty, corrosive. In general radar antenna has the following form: ( 1) Columnar antenna: it is suitable for the working condition of medium is corrosive and condensing condition, in addition, also including the roof tank is fixed, lie can of radar level gauge wave Angle range east barrier-free level measurement, the applicable scope is small measuring range, the size of the mounting holes is casual, material also more common. ( 2) Horn antenna: horn antenna applications, most of the occasions to be able to apply, install location is usually in the roof, but some places still cannot be applied, such as asphalt, such as liquid sulfur and its poor conditions can't use, it's a fairly large measuring range. Common materials include hartz alloy, etc. ( 3) Paraboloid antenna, the antenna either liquid or solid and serous medium to be able to apply. Because of its characteristic of focusing ZUI, relatively stable, radar beam are also small. Its measuring error range is small, also can be measured in a long range. Stain resistance is strong, in the face of extreme condition is also capable of. Thrown if the tank liquid level meter when choosing level measurement radar Xu Ya factor also is more, if there is a process of its have special requirements, such as measurement error. Range must be very small, measuring stability is very high, level measurement of radar antenna is usually has the following kinds: ( 1) Paraboloid antenna: when need to install the antenna products are fixed roof tank or condensation is serious, so the antenna will come in handy, can run in the product can be directly in the process of the installation. ( 2) Horn antenna: with the parabolic antenna is similar in some ways, the installation is basic same, also do not need to stop running products in the process of installation. ( 3) Guided wave tube array antenna: its installation location is in pipe installation, generally the installed product is crude oil or refined oil storage tank, storage tank, but also must be external floating roof oil tank, installation also does not need to stop running products can be. ( 4) LPG/LNG antenna, the antenna installation requires product after stop, suitable for high pressure or low temperatures of liquid level measurement. 2. Note (2 radar level meter Ann 1) Beam Angle range to keep no obstacle: because of the way it works is the reflection, then reflection, then to receive, if there are obstacles, will affect receiving measurement, affect the precision. ( 2) With material mouth and pot of center distance, because the material near the mouth if installed level gauge, the receiver will receive many wrong reflection wave, so unavoidably affect measurement accuracy. To avoid this kind of phenomenon, also cannot be installed in the center of the tank near, generally want to closer to the tank wall. ( 3) Installation position can't have a strong air flow phenomenon: some craft condition is in and its strong physical environment or a strong chemical reaction, so the installation shall adopt by-pass pipe installation, use this way to receive wave can accurately reflect the actual situation of liquid level.

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