The AD375MA and AD375MAL absolute shaft encoders are low powered, microprocessor controlled devices, suitable for reliable and accurate sensing of water level. The internal CMOS circuitry enables the encoder to output measured values in absolute format. The encoder measures the angular position as the shaft rotates with changes in water level,totalises the signal and outputs in either 4-20mA (AD375MA only), SDI-12 or RS232. The signal can be viewed via the LCD display showing 4-20mA range, current water level reading and battery voltages.The encoder can be float operated or connected to mechanical sensors, chart recorders and weir gates, utilising drive gears or chain and sprocket assemblies.