Ultrasonic Level Sensor Used with Stilling Well in Water Level Sensing

MNU Ultrasonic Sensor mounted under a manhole cover in a sewer applicationIn some water level sensing applications whether they are tank level, river and lake height or similar, it is sometimes necessary to use an alternate mounting method especially when an unobstructed path to the target is not feasible or there is a lot of foam or turbulence which can disrupt water level readings. This is necessary, especially with ultrasonic technology.

One such choice of alternate mounting is the use of a stilling well, as seen above with an MNU Ultrasonic Level Sensor, mounted under a manhole cover in a sewer application.

The Art of the Stilling Well

Illustration of a stilling well

For both contact and non-contact methods of liquid level measurement, surface disruption can cause problems. Stilling wells are a great way to dampen disruptions, and provide a clean target surface for an accurate measurement.

Stilling wells are used most often with ultrasonic sensors, as they dampen waves and turbulence, and reduce foaming. However, level probes and some float switches can also benefit. When installed properly, they can be a great way to improve your sensor's performance, increase accuracy, and tame difficult applications.