Measuring through plastic tanks: Application of the Month

Radar signals can penetrate non-conductive products like plastic. The radar signal essentially ignores the vessel structure and gets a reflection off of the medium inside. This means users can install a VEGAPULS WL S 61 or an 80 GHz VEGAPULS 64 above one of these plastic vessels and still get the measurement they need. This makes for an easy installation without having to penetrate the vessel or render an IBC tank motionless. VEGA has extensive experience with these types of applications, saving customers time and improving their process.

When mounting a radar above a plastic tank, there are a few things to consider to ensure you get an accurate measurement. Installers need to be aware of where the vessel is located and how the radar is mounted. Following a few best practices can deliver the best results.

Mount the radar above a plastic tank indoors only, away from the elements. That’s because weather like rain, snow, or other moisture on top of the vessel can reflect the radar signal and cause a measurement error. On the other hand, even some dust or dirt that accumulates on top of a vessel indoors won’t interfere with the radar signal thanks to the interior electronics.

The sensor should be placed between four and eight inches above a curved portion of the tank or vessel. This additional space and curvature allows any minimal reflections from the vessel exterior to reflect laterally instead of directly returning to the antenna surface. In the case of an IBC tanks or other vessels with a flat top, this may not be possible, and additional adjustments may be needed. And finally, make sure the sensor is far enough from the sidewall because metallic objects outside of the vessel can be detected by the sensor.

Measuring through plastic tanks provides an easy and accurate way to continuously track level of liquids stored in poly vessels and IBC tanks. The radar signal can penetrate non-conductive products like plastic, so there’s no need for an invasive process connection, and portable vessels can still be moved. And with radars like the VEGAPULS WL S 61, this measurement can be made inexpensively after a quick and easy setup.