Absolute rotary encoder AD375MA

digitalparallel4-20 mA

The AD375MA is a rugged, microprocessor-based, power-efficient shaft encoder for reliable and accurate water level measurement. The built-in digital technology determines the absolute water level from the reference level and the relative rotational movements at level increase or decrease. This eliminates any further calculation or conversion in downstream data acquisition devices. LCD display and keypad allow user interaction without the need of an additional device. Device settings include user adjustable resolution (375, 150 or 100 pulses per revolution) and adaptation to 3rd party pulleys/ chains and sprockets. Furthermore, current system status and measurement data can be read directly from the LCD (water level, battery voltage, ...). Measured values are available simultaneously on 4-20 mA and SDI-12 outputs. The encoder can be float operated or connected to mechanical sensors, chart recorders and weir gates, utilising drive gears or chain and sprocket assemblies. High-resolution measurement 1 mm Absolute water level Parallel data output via 4-20 mA and SDI-12 (or RS232) to connect to up to two data loggers (redundancy) Controls - LCD display and two buttons - Display: measuring range, water level and battery voltage - Sensor configuration Slippage reduction via beaded line and matching perforated disc Robust construction Battery backup Resolution - 1 mm (maximum error +/-1 mm) 375, 150 or 100 pulses per revolution (user adjustable) Accuracy - +/-0.01 % FS Range - Typical up to +/-30 m water head; endless wire set-up available for water level ranges exceeding 30 m