Siemens RDG400KN User Manual download pdf (Page 19)

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Siemens Flush-mount room sensors AQR253... AQR257... CE1P1411en

Building Technologies Functionality / Use 2013-04-17

The integrated room humidity controller and room air quality controller can be used

for ventilation control. Both controllers receive up to three switching point values,

one blocking/release object, or a switching signal (e.g. motion detector) via the

bus. When the respective switching point is exceeded, up to three control signals

and one quasi-continuous signal to control the ventilation actuators are transmitted

to other bus members. In addition, a signal with the max. control value from both

controllers is available.

The following table provides information on assessing room air quality based on

the determined CO

concentration.

[ppm] Typical CO

concentration

<400 Outside air

700 City air

1000 Comfort limit

1500 Ventilation strongly recommended

2000 Inacceptable indoor air quality

4000 Bedroom at poor ventilation

5000 Max. concentration for workspaces (MAC value)

40000 Exhaled air

concentration measurements are influenced by air pressure and temperature.

The lower the air pressure, the lower the measured value. Temperature influence is

corrected automatically if a front module with temperature sensor is installed. The

sensor allows for correcting the determined measured value to the prevailing

average air pressure at the mounting location. To do this, altitude [m above sea

level] must be set. The correction has the following effect on an uncorrected

measured value of 1000 ppm at normal conditions (0 m altitude, 25 °C):

Altitude [m] 0 500 1000 1500 2000 2500 3000

[ppm] 1000 1095 1201 1317 1445 1586 1740

The room sensor monitors the parameterized sensor variables and the

parameterized front module. An error message is generated if a required sensor

variable does not exist or cannot be measured.

Air quality

measurement and

assessment

(AQR2576…)

Response to errors

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Siemens RDG400KN User Manual Page 19