Sewi KNX AQS/TH-D

The Sensors Sewi KNX AQS/TH-D for the KNX bus system measures the CO2 concentration in a room. They additionally measures the temperature, the air humidity and the air pressure and calculates the dew-point. The sensor can output a warning to the bus as soon as the comfort field, as per DIN 1946, is left. Via the bus, the indoor sensors can receive external values and process it further with its own data to a total value (mixed value, e.g. room average). All measurement values can be used for the control of limit-dependent switching outputs. States can be linked via AND logic gates and OR logic gates. Multi-function modules change input data as required by means of calculations, querying a condition, or converting the data point type. In addition, an integrated manipulated variable comparator can compare and output variables that were received via communication objects. Integrated PI-controllers control ventilation (according to humidity or CO2 concentration) and heating/cooling (according to temperature).

Models:

N° EL-70397 Sewi KNX AQS/TH-D sensor for CO2, temperature, humidity, pressure, white

N° EL-70697 Sewi KNX AQS/TH-D sensor for CO2, temperature, humidity, pressure, jet black

Functions

• Measuring the CO2 concentration of the air, the temperature and air humidity (relative, absolute), each with mixed value calculation
• Bus warning with regard to whether the values for temperature and air humidity are within the comfort field (DIN 1946). Dew point calculation. The share of internal measurement value and external value can be set as a percentage
• Air pressure measurement. Output of the value as normal pressure and optionally as barometric pressure
• Threshold values can be adjusted per parameter or via communication objects
• PI-controller for heating (one or two-stage) and cooling (one or two-stage) according to temperature. Regulation according to separate setpoints or basic setpoint temperature
• PI controller for ventilation according to humidity and CO2 concentration: Ventilate/Air (one-stage) or Ventilate (one or two-stage)
• 4 actuation variable comparators to output minimum, maximum or average values. 5 inputs each for values received via communication objects
• Summer compensation for cooling systems. A characteristic curve matches the set temperature in the room to the external temperature and sets the minimum and maximum target temperature values
• 8 AND and 8 OR logic gates each with 4 inputs. All switching events as well as 16 logic inputs (in the form of communications objects) can be used as inputs for the logic gates. The output from each gate can be configured optionally as 1-bit or 2 x 8-bit
• 8 multi-functional modules (computers) for changing the input data by calculations, by querying a condition or by converting the data point type
• Configuration is carried out with the KNX software ETS

Technical Data