The aquastar MT pH/ORP/T is a measurement electronics unit that is mounted directly on a pH or redox sensor and transmits the measured values to a measurement or automation device, either digitally via RS485 Modbus RTU or analog as a 2-wiretransmitter with a scalable 4–20 mA signal. The electronics are available with an N-connection, BNC connector, or Variopin and are connected via a 5-pin M12 connector.

Typical applications include aquaculture and fish farming, marine research and aquariums, water and wastewater, food and beverages, chemicals, power plants, environmental monitoring, and other industrial liquid analysis. In digital operation, the cable between the sensor and the measuring equipment can be up to 1,000 m long.

Calibration data is stored in the electronics so that the sensor can be calibrated before commissioning, and the electronics can be reused when the sensor is replaced. The electronics detect glass breakage, cable breakage, and a dirty glass membrane; they feature a calibration timer, a calibration log with the last 10 calibrations, an hour meter, and temperature compensation via Pt1000.