Data Sheet for Product

6/10
Siem ens Indoor air quality sensors QPA10.., QPA20.. CE1N1961en
Building Technologies 2018-05-01
– Jumper in the mid position (R2) = 0...50 °C (factory setting)
O1 = 4...20 mA
O2 = DC 0…10 V
O3 = DC 0…5 V
Jumper for the measuring range in the vertical position:
The signal output delivers the values according to table "Test function active".
· For the unit of temperature:
– Jumper in the horizontal, lower position = °C (factory setting)
– Jumper in the horizontal, upper position = °F
· In the event of VOC failure, DC 10 V or 5 V or 20 mA is present at signal output X1
(after 60 seconds).
· In the event of CO
2
failure, DC 10 V or 5 V or 20 mA is present at signal output X1
(after 60 seconds).
· In the event of CO
2
or VOC failure, DC 10 V or 5 V or 20 mA is present at signal
output X2 (after 60 seconds).
· If the temperature sensor becomes faulty, 0 V or 0 mA is present at signal output X2
(after 60 seconds).
· If the temperature sensor becomes faulty, 0 V or 0 mA is present at signal output X3,
and the humidity signal at signal output X2 increases to DC 10 V or 5 V or 20 mA
(after 60 seconds).
· If the humidity sensor becomes faulty, DC 10 V or 5 V or 20 mA is present at signal
output X2 (after 60 seconds), and the temperature signal remains active.
With sensors type QPA2002D, QPA2060D and QPA2062D, the measured values can
be read on an LCD. The following measured values are displayed:
- CO
2
: In ppm
- CO
2
+ VOC: As a bar chart: 4 bars X2 = 2 V or 1 V or 7.2 mA,
20 bars X2 = 10 V or 5 V or 20 mA)
- Temperature: In °C or °F
- Humidity: In % r.h.
The passive, measured temperature value cannot be displayed on type QPA2080D.
Engineering notes
Room sensors with active outputs have a high power loss, which can influence temper-
ature measurement.
The measuring accuracy is impacted by the following factors:
- Prevailing air flow
- Wall surface (rough, smooth)
- Wall texture (wood, plaster, concrete, brick)
- Wall type (interior, exterior).
This application-specific measuring inaccuracy is constant for an installed sensor after
approx. 1 operating hour, and it can be adjusted as needed in a higher system (e.g.
controller). No correction on the local LCD.
The sensor must be powered by a transformer for safety extra low-voltage (SELV) with
separate windings, suited for 100 % duty. Size and fuse it in compliance with local safe-
ty regulations.
When sizing the transformer, consider the power consumption of the sensor. For infor-
mation about wiring, see the data sheets of the devices with which the sensor is used.
Observe maximum permissible cable lengths.
…for output for all
QPA…
… for the active test
function
… for selection of the
temperature unit on the
display
Behavior in the event
of fault
QPA1…
QPA2…
QPA2002
QPA2060 and QPA2060D
QPA2062 and QPA2062D
Display of measured
values