The KNX Sensor Water Quality SK08-WAQ is a sensor/controller from the series S8 used for recording and controlling water parameters: phvalue,redox potential and water temperature. The sensor/controller has two high impedance BNC inputs for connecting a single-rod measuring cell for pH value and redox potential. The inputs are galvanically separated from the KNX bus so that no ground loop can occur. The SK08-WAQ has an integrated KNX bus coupler and does not require additional voltage. The transducer with the bus coupler is enclosed in a durable, sealed, glass ball-reinforced plastic casing which fulfills protection degree IP65. Additionally two inputs for dry contacts are available.

Arcus-EDS offers a set of electrodes from the manufacturer Hanna; electrodes of all other makes and applications may also be used.

In the application software there are several controllers (two-position or PI controller with continuous or pulsed output) for measuring the pH value and redox potential. Additional functions include the display of upper and lower thresholds and switching between the set point and threshold.

The sensor records the time period from the last calibration and can be used as an alarm function should the threshold be exceeded. The sensor is calibrated via the KNX bus using two calibration functions. In general, the pH-value probe is set up as a two-position calibration and the redox potential as a one-position calibration.

The sensor is configured with ETS (KNX Tool Software) and the application program. Controlling functions such as signal threshold and other adjustments are parameterized using ETS (KNX Tool Software).