Radar level gauge installation environment

How to correctly select a radar level gauge - installation environment When selecting a radar level gauge, the influence of stirring and vacuuming should be considered, and attention should also be paid to the power supply and output signal. 1. Type selection in the case of stirring In the tank with stirring, generally do not use guided wave radar. The force brought by the stirring can easily bring the cable of the guided wave radar into the propeller, or the rod of the rod-type guided wave radar. Bend. Therefore, only high-frequency or low-frequency horn-mouth radar can be selected for non-contact measurement. If the lowest liquid level on site is above the stirring propeller, it generally has no effect on the measurement. If the minimum liquid level will be lower than the stirring propeller, it is necessary to filter out the signal reflected by the propeller by learning the function of false echo, so as to ensure that the propeller is not used as the measurement target during measurement. 2. Selection under vacuum conditions Under vacuum conditions, the boiling point of the liquid will be much lower than that under standard atmospheric pressure. There are many liquids that start to boil at 30-40°C. When there is no vacuum, the liquid is very calm. When the vacuum is applied, the liquid of 1 meter will become 3 meters high, all of which are boiling foam and small liquid droplets. In this case, only the bell-mouth radar can be used, and then certain changes must be made on site before it can be used. 3. Power supply and output signal The power supply of the radar level gauge is basically 24VDC. If 220VAC is required, it must be equipped with a 220VAC to 24VDC switching power supply. There are two types of radar output signals: 4-20ma and 485. 4-20ma is currently the dominant signal and is widely used in industrial occasions. There are few 485 users, and it is generally used in occasions requiring low power consumption, such as water conservancy and hydrology, flash flood warning, etc.

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