Brine tank level monitoring is an important means to evaluate whether the brine system of freezing project is operating normally. In the construction of freezing project, brine leakage accidents such as freezing pipe rupture are usually detected by observing the brine tank level, so brine tank level measurement is important. Ultrasonic level meter uses non-contact measurement, high measurement accuracy, and is not affected by changes in brine density, so it is used to measure the brine tank level, but in the measurement may still produce measurement errors, how should we avoid it?

Ultrasonic level meter measurement principle, is integrated transmitter and receiver of the sensor to send out ultrasonic pulses, reflected from the brine level and received by the same sensor, and according to the time difference to calculate the distance between the sensor and the brine level. To make the ultrasonic level meter achieve the best measurement effect, some measures must be taken to avoid interference and abate the error.

First of all, excessive electromagnetic interference in the ultrasonic level sensor wholesale installation area will produce measurement errors. Separate the power supply of the level meter from other equipment susceptible to electromagnetic interference and ground it reliably, and use shielded signal line between the level meter and the digital display, which is effective in eliminating electromagnetic interference. Secondly, affected by the absorption of brine pump water and pipeline backwater, the level of brine tank fluctuates greatly, and this problem can be solved by adding a wave guide tube. Waveguide inner diameter should be greater than 120mm, smooth inner wall, no seams, when installing the waveguide tube, the inner wall must be cleaned of residual water beads and other small objects. The waveguide should be placed perpendicular to the liquid surface of the brine, and the sensor is placed at the top center of the waveguide. When the brine is easy to bubble, the liquid surface of the waveguide tube will accumulate a lot of foam, and foam will absorb sound waves, resulting in measurement errors, can be installed in the waveguide tube diameter is slightly smaller than the waveguide diameter of the circular PP floating plate, floating plate thickness of not more than 10mm, it can float on the surface of the brine, effective reflection of sound waves, to solve the problem of measurement errors caused by foam absorption of sound waves. In addition, the sensor vibration is too large, which will produce measurement errors, the level meter can be far away from the brine pump and other equipment that produces large vibration, the connection pipeline between the brine pump and the tank can be increased by soft joints, and the peripheral equipment can be checked regularly to eliminate defects in time. And reduce the vibration.

Finally, you should know that the brine temperature is low, usually add insulation layer at the top of the brine tank, if the ultrasonic level meter is placed at the top of the brine tank, you need to open slits in the insulation layer, so that the steam will evaporate and affect the propagation speed of the sound waves; and will condense on the sensor surface, resulting in measurement errors. The wave guide tube can be placed outside the brine tank, and the bottom is connected to the brine tank. The temperature of the brine inside the wave guide outside the tank will gradually equal to the ambient temperature to solve the problem of condensation on the surface of the brine. Ultrasonic level meter and radar level meter are very precise measuring instruments, so to abate their measurement errors, you also need to observe carefully, fully grasp professional knowledge, and analyze and take measures in combination with specific working conditions