The Hydrological Services Absolute Shaft Encoder model AD375MA is low power, microprocessor controlled non recording shaft encoder designed for field operation to enable measurement of water level. The internal CMOS circuitry enables the encoder to output measured levels in absolute format.
The absolute shaft encoder measures the angular position as the shaft rotates, totalises the signal and outputs both 4 to 20 mA and  SDI12. This signal relates to absolute level change from a set datum.
The signal can be viewed via the LCD display showing 4-20mA range and current water level and battery voltages
The shaft encoder can be float operated or connected to other servo mechanical sensors, chart recorders and weir gates with drive gears or chain and sprocket assemblies.

- High Accuracy 0.01% F.S.
- 4-20mA current loop drive (9V to 30V DC) used as a 2-wire current loop transducer, SDI-12 (converted to RS232 with an adaptor)
- Programmable LCD
- Level reading, range
- Takes standard float kits
- Digitises water level readings
- Absolute level readings
- Robust construction
- Lithium battery backup