The microprocessor-based U44xx family of ultrasonic sensors from Madison Co., Branford, CT, are designed for noncontact level, presence/absence, volume, proximity, and distance measurements. The self-contained U4466 Series has set-up software and user-selectable options. The loop-powered U4467 Series measures volume and open-channel flow of liquids and is suited for hazardous locations when used with an approved barrier; an optional remote programmer is available. The U4468 Series is Web-enabled for affordable monitoring and control of local and remote tank conditions. Applications include car wash vehicle position and spray arm locations; vessel liquid level; river, stream, or irrigation canal flow and level; and wastewater effluent gate for discharge rate monitoring.