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1. Ultrasonic level gauge installation requires a very small diffusion angle for ultrasonic emission. If there are other objects blocking within its diffusion angle, reflection will occur. If the reflection is strong, it will cause measurement error.
The installation location should be kept away from uneven walls and away from escalators, liquid injection (material) ports, and mixing blades that can block sound waves.
If it is a closed container, the flange on the container should meet the following requirements:
The flange inner diameter is preferably larger than 120mm, and the length of the flange pipe is less than 100mm. The inner wall of the pipe is smooth, and the lower edge is preferably coated with a soft plastic film. The inner diameter of the flange should be greater than 70mm, the flange pipe should be as short as possible, the inner wall of the pipe is smooth, and the lower edge is a smooth arc. Flange diameter should be greater than 200mm, such as the length of the flange pipe is greater than 100mm, it is required that the inner wall of the pipe is smooth, and the lower edge is smooth arc.
If the flange at the mounting position does not meet the requirements of the above technique, and the meter operation is unstable after the installation, the value of the liquid level jumps to a large value or is always a large value, which can be handled as follows:
Insert a plastic tube into the container at the flange opening until it reaches the bottom of the container. The plastic pipe shall be straight and smooth on the inner wall, and a hole shall be opened above and below it to ensure the same liquid level inside and outside the pipe. The inner diameter size of the plastic pipe is as follows:
Tube inner diameter greater than 55mm greater than 50mm for small range, can be smaller recommended modification of the installation flange if the liquid level fluctuations, or floating ball, there are objects blocking the sound wave, etc., can add a plastic tube to the container, so that the sound wave Spread in the plastic tube to ensure stable and reliable measurement.
The installation should ensure that the liquid level or material level does not enter the blind area of ​​the level meter.
If necessary, you can increase the level gauge installation. When the height is increased, the inner wall of the butt tube should be smooth and its inner diameter should not be greater than the inner diameter of the flange of the container.
When flanged, the flanges prepared for the level gauge should be plastic. The best method is to specify the size of the mounting flange at the time of order, which is directly prepared by the manufacturer.
The surface of the probe of the level gauge probe should be perpendicular to the liquid surface or the material surface. When installing, align the target as much as possible.
Keep away from devices that are prone to strong electromagnetic interference.
2. When connecting the ultrasonic level gauge wiring, remove the shield plate to expose the entire wiring terminal. Use "a" small screwdriver for wiring.
III. Ultrasonic Level Gauge The energized working instrument is first displayed as HLUC after power on. The level value is displayed after a few seconds, and the indicator light flashes once every 1 second.
The level gauge actually measures the distance from the probe to the liquid surface or the material surface, and then converts the level or material level. It is important to master this principle.
Press the SEL key to view the range value and temperature value.
Press the MOV and SEL keys at the same time to enter the parameter setting state, set the installation height and range, and then set the upper limit and lower limit as required. After setting, press the SEL key again. Then press the MOV and SEL keys simultaneously to return to the measurement state. The meter will display the correct level value, output the correct current signal, high and low switching signals.
If the measurement is wrong, please refer to the following section "Troubleshooting".
IV. Ultrasonic Level Gauge Troubleshooting Symptoms Cause Solution The meter does not display, does not work Power supply error wiring error Check whether the DC24v power supply is correct Check the wiring is correct. The instrument has a display, does not work Level meter is not aligned with the liquid level or material level The liquid level fluctuation is very large. The material surface is uneven. The liquid surface has a thick foam layer. The liquid is drained. After the material is empty, the bottom of the container is not over the measuring range. Adjust the alignment of the level meter. Use the level proofreading to add in the container. The plastic tube (see installation section) should be used for a more large-scale level meter. Use a more large-quantity level meter or other measurement method to add liquid or add material to recover. Use a more large-scale level meter to display. Large deviations in the stability or measured values. Entry into the blind area. Unstable power supply. Strong electromagnetic interference. Objects that block acoustic waves Prepare metal flanges on the level gauge. Probe face or side contact with metal. Calculate or prevent excessively high level of supply. Improve the power supply to the level meter. Connect to the ground or shield to change the installation position or add plastic pipes. Use plastic flanges. Use rubber pads and metal separators. from.
How to Install the Flange Ultrasonic Level Gauge Correctly
Flange-type ultrasonic level gauges how to correctly install ultrasonic level gauge is a microprocessor-controlled digital level gauge, through the piezoelectric crystal or magnetostrictive device into electrical signals, and the transmission and reception of sound waves between The time to calculate the distance from the sensor to the surface of the liquid to be measured is a non-contact measuring instrument. The proper installation of ultrasonic level gauges is the key to reliable operation. The level gauge is installed above the container, and the probe's emitting surface is perpendicular to the liquid surface or material surface. If it is a closed container, it should be flanged. In other cases, simple bracket mounting can be used. Flange mounting should be based on the thread size on the level gauge to prepare the flange.