5
Description
Sensors Sewi KNX AQS and Sewi KNX AQS/TH-D
• Version: 10.09.2018 • Technical changes and errors excepted.
1.
Description
The
Sensors Sewi KNX AQS and Sewi KNX AQS/TH-D
for the KNX bus system
measures the CO
2
concentration in a room.
Sewi KNX AQS/TH-D
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 out-
puts. States can be linked via AND logic gates and OR logic gates. Multi-function mod-
ules change input data as required by means of calculations, querying a condition, or
converting the data point type. In addition, an integrated manipulated variable compar-
ator can compare and output variables that were received via communication objects.
Integrated PI-controllers control ventilation (according to humidity or CO
2
concentra-
tion) and heating/cooling (according to temperature).
Functions:
•
Measuring the
CO
2
concentration
of the air with
mixed value calculation
.
The share of internal measurement value and external value can be set as a
percentage
•
Threshold values
can be adjusted per parameter or via communication
objects
•
PI controller for ventilation
according to CO
2
concentration: Ventilate/Air
(one-stage) or Ventilate (one or two-stage)
•
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 of each gate can be configured optionally as 1-
bit or 2 x 8-bit
•
8 multi-function modules
(computers) for changing the input data by
calculations, by querying a condition or by converting the data point type
•
4 actuating variable comparators
to output minimum, maximum or
average values. 5 inputs each for values received via communication objects
Additional functions Sewi KNX AQS/TH-D:
•
Measuring the
temperature
and
air humidity
(relative, absolute), each with
mixed value calculation
. The share of internal measurement value and
external value can be set as a percentage
•
Bus message, whether the values for temperature and air humidity are within
the
comfort field
(DIN 1946).
Dew point
calculation
•
Air pressure measurement.
Output of the value as normal pressure and
optionally as barometric pressure
•
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
