Greyline Instruments” DLT 2.0 can measure both differential level at a barscreen, plus open-channel flow through a flume. It works with two noncontacting ultrasonic sensors. One sensor is installed upstream from the barscreen and a second sensor downstream for differential level control. Or you can install the second sensor in a flume to control and transmit differential level control plus flow. The DLT 2.0 includes relays for barscreen rake and level control, as well as three 4-20 mA outputs (upstream level, differential level, downstream level or flow). The large backlit LCD display shows level, differential level, flow and total flow. Intrinsically safe sensors and data logger are optional.