Basic requirements and installation location of ultrasonic level gauge installation

1. The installation of ultrasonic level gauge basically requires a certain opening angle when transmitting ultrasonic pulses. From the lower edge of the transducer to the surface of the medium to be measured, there should be no obstacles in the area radiated by the emitted ultrasonic beam, so the installation should try to avoid the facilities in the tank, such as: ladders, heating equipment, Limit switch bracket, etc. In this case, 'false echo learning' must be performed at the time of installation. Also note that the ultrasonic beam must not intersect the feed stream. When installing the integrated ultrasonic liquid level meter, pay attention to: the highest liquid level shall not enter the measurement blind area; the integrated ultrasonic liquid level meter must maintain a certain distance from the tank wall; the installation of the integrated ultrasonic liquid level meter shall be as vertical as possible to the liquid level; Integrated ultrasonic level gauges in hazardous areas must comply with the national installation regulations for explosion-proof hazards. The integrated ultrasonic level gauge is installed in the occasion with explosion-proof requirements, and the ultrasonic level gauge must be grounded. The reference surface for measurement is the lower edge of the transducer of the ultrasonic level gauge. Description: ①Blind zone range; ②Span setting; ③High level adjustment; ④Low level adjustment ①Reference plane ②The center of the container or the integrated ultrasonic level gauge of the symmetrical axis should be installed at the center of the top of the conical tank. For the conical container and the flat top of the tank, the installation position of the instrument is the center of the top of the container, which can ensure that the measurement of the container is bottom. The picture shows the correct installation position and wrong installation position of common ultrasonic level gauges ① Error: The transducer should be perpendicular to the surface of the measured medium. ②Error: The integrated ultrasonic level gauge is installed on the dome or round tank top, which will cause multiple reflection echoes, which should be avoided as much as possible during installation. ③It is the correct installation method of the ultrasonic level gauge ①Wrong: Do not install the integrated ultrasonic level gauge above the feed stream to ensure that the surface of the medium is measured instead of the feed stream. ②The correct installation of the instrument should take sunshade and rainproof measures when installing the instrument outdoors. 3. Moisture-proof of the integrated ultrasonic level gauge For the integrated ultrasonic level gauge installed outdoors, in a humid room and on the top of a refrigeration or heating tank, in order to prevent moisture, the cable gland should be tightened, and the cable should be bent at the inlet ( As shown in the left figure) Length of the container nozzle: It must be ensured that the probe extends out of the container nozzle at least 10mm ① In the case of good reflectivity of the medium, the diameter of the container nozzle is large, and the length of the nozzle can be slightly longer than that of the converter (Figure 1) The table on the right lists different diameters Recommended value for the length of the takeover. The end of the nozzle must be smooth, burr-free and as rounded as possible. In addition, 'false echo learning' must be performed. ②When the reflectivity of the medium is not good and the highest material level may enter the blind area, when the nozzle position of the integrated ultrasonic level gauge must be increased, the installation method of the horn-shaped waveguide can be used to increase the directionality of the signal and reduce the connection between the nozzle and the nozzle. The influence of measurement (Figure 2) 4. The influence of stirring on the ultrasonic level gauge When there is stirring in the tank, the integrated ultrasonic level gauge should be kept away from the agitator, and the 'false echo learning' should be carried out in the stirring state after the instrument is installed. , to eliminate the effect of false echoes generated by the stirring blades. If foam or waves are created due to agitation, the still-pipe installation method should be used. 5. The effect of foam on the ultrasonic level gauge When feeding, stirring or other treatment processes in the container, foam will form on the surface of some media, attenuating the signal of the ultrasonic level gauge. If foam causes errors, install the sensor in a still-pipe or use a guided-wave radar level gauge. Guided wave radar level gauge measurements are unaffected by foam and are the best choice for this application. 6. The influence of airflow on the ultrasonic level gauge If there is a strong airflow in the container, if it is installed outdoors and the wind is very strong, or there is air vortex in the container, the sensor should be installed in the waveguide or the level of guided wave radar should be used count.
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