USR Series ultrasonic level sensors from Madison Co., Branford, CT, are for short-range level measurement in process and industrial applications. There are five models, each with a factory-set sensing range. Microprocessor-based circuits provide a temperature-compensated signal. You can get the sensors with a USR level controller, which is programmable for up to 2 sensors and provides an integrated user-programmable display and alarm. The controller can also be programmed with hysteresis and alarm delay options to match process control range requirements.