15
Parameter setting
Sensor KNX AQS-UP basic
• from software 3.1 • Status: 24.03.2016 • Technical changes reserved. Errors reserved.
4.4.
CO2 threshold values
Activate the threshold values that you want to use here. The
Sensor KNX AQS-UP
basic
provides three four threshold values for carbon dioxide.
Table of CO2 values:
1000 ppm corresponds to 0.1% CO2 content.
4.4.1. Threshold value 1, 2, 3, 4: CO2
Threshold value
Set the threshold values directly in the application program using parameters, or de-
fine them via the bus using a communications object.
Threshold value setpoint using parameter:
Set the threshold values and hysteresis directly.
Threshold value setpoint using a communications object:
Beforehand, enter how the threshold value will be received from the bus. Basically, a
new value can be received, or simply a command to increase or decrease.
During initial commissioning, a threshold value must be defined which will be valid un-
til the 1st communication of a new threshold value. For units which have already been
taken into service, the last communicated threshold value can be used. Basically, a
temperature range is given in which the threshold value can be changed (object value
limit).
A set threshold value will be retained until a new value or a change is transferred. The
current value is saved in EEPROM, so that this is retained in the event of a power sup-
ply failure and will be available once the power supply is restored.
Use threshold value 1/2/3/4
Yes • No
300 ... 500 ppm
Fresh air
1500 ... 3000 ppm
"Stale" air
5000 ppm
Maximum allowable concentration
Threshold value setpoint using
Parameter
• Communications object
Threshold value in ppm
0...5000; 1200
Hysteresis of the threshold value in %
0 … 50; 20
Threshold value setpoint using
Parameter •
Communications object
The last communicated value should be
retained
• never
• after restoration of power
• after restoration of power and
programming
Start threshold value
in ppm
valid till 1st communication
0...5000; 1200
