Radar level meter is a common product type of level instrument, which has the advantages of accurate measurement, stable performance, high reliability, easy maintenance and wide application range. It can be installed in various metal and non-metal containers or tanks to measure the level of liquid, slurry and particles. So, what special conditions will it be installed in?
one
Type selection with stirring
In the stirred tank, generally do not use the guided wave radar level gauge, the force brought by stirring, it is easy to bring the guided wave radar cable into the stirring device, or the rod guided wave radar rod to pull the bend. Therefore, it is only possible to choose non-contact measurement of frequency modulation or high-frequency horn radar level meter to measure.
2
Selection under vacuum conditions
Under vacuum conditions, the boiling point of a liquid will be much lower than at standard atmospheric pressure. There are a lot of liquids that start boiling at 30-40 degrees Celsius. Especially the reaction kettle and evaporation kettle, when there is no vacuum, the liquid is very calm, the vacuum is pumped, the liquid level fluctuates greatly, and it is boiling foam and small water beads. In this case, only the non-contact radar can be used, and then certain changes must be made on site to make it work normally.
3
The medium contains a lot of foam, water steam, dust selection
Generally there are a variety of forms of media, most of them are liquid, we generally recommend to choose the frequency modulation radar level meter measurement, its operating frequency has the electromagnetic characteristics of terahertz band, such as: has the ability to penetrate non-polar substances, in the strong adhesion strong dust industrial environment, has a very ideal measurement stability and environmental anti-interference ability; For strong dust conditions, we can add a universal joint to adjust the measurement direction, with purging function, in order to prevent measurement errors.
4
Selection of operating temperature above 200℃
The general operating temperature is -40℃-150℃. However, under high temperature conditions, we must choose a high temperature radar level meter to ensure that the radar level meter can work normally.
5
Selection parameter
● Installation position Opening position, distance from tank wall, inlet/outlet position, size and length of short nozzle, whether there is a cut-off valve (gate valve or ball valve) on the short nozzle;
● Tank structure Tank structure and shape (conical tank, spherical tank, reaction kettle, horizontal tank, silo), tank height and diameter, whether there is a wave guide tube and the diameter of the wave guide tube in the tank, the material of the tank lining, whether there is a heating coil in the tank, whether there is an internal floating roof in the tank, and whether there are other obstacles in the tank;
● Measuring dielectric liquid: dielectric constant, foam, corrosion, steam, crystallization, medium viscosity, temperature, pressure, liquid level fluctuation; Solid: dielectric constant, dust, pile Angle, inlet and outlet speed, whether it can be universal purging;
● Connection mode flange size, nominal pressure, sealing surface requirements, whether with matching flange;
● Power requirement 24V/220V;
● Signal output requires 4-20mA or RS-485
● Required size of electrical interface: M20*1.5, 1/2NPT, etc.
● Whether there is stirring in the reactor, several layers of stirring, how far the stirring fan is from the tank wall, and the speed of the agitator;
● Power supply environment Whether the on-site power supply is a separate power supply, whether the signal cable is separated from the high-voltage cable, and whether there is interference from high-power electrical equipment around.