User Guide

Technical Instructions QPA63 Series CO
2
/VOC Sensors
Document Number CM1N1958E-P25
November 21, 2006
Page 2 Siemens Building Technologies, Inc.
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•
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Application,
Continued
The sensor can be used as the following:
Room sensor to measure room air quality.
Duct sensor in conjunction with the ARG64 duct mounting kit to measure
exhaust air quality.
Typical areas of use:
Measuring CO
2
and VOC concentration.
In party rooms, lounges, exhibition halls, restaurants, canteens, shopping malls,
gymnasiums, sales rooms, and conference rooms. In this case, the AQP63.1
ventilation demand processor, which calculates the ventilation demand signal for the
ventilation controller based on the CO
2
and VOC signal, is required. For more
information on the AQP63.1, see Technical Instructions (CM1N1959E-P25).
• Measuring CO
2
concentration.
In rooms with varying occupancy at different hours where smoking is prohibited
such as museums, theaters and auditoriums.
NOTES: 1. The sensors cannot be used as safety devices, such as gas or smoke
warning devices.
2. The sensors cannot be used on rooftop air ducts (solar radiation).
Product Numbers
Table 1.
Product Number Description
QPA63.1
CO
2
/VOC Sensor Without LEDs
QPA63.2
CO
2
/VOC Sensor With LEDs
ARG64 Duct Mounting Kit for QPA63 Series
ARG70 Wall Mounting Kit for QPA63 Series
Ordering
You must order the ARG64 Duct Mounting Kit separately.
Compatibility
The sensors are suited for use with all systems, controllers and devices capable of
acquiring and handling the 0 to10 Vdc output signal.
Function
The sensor detects the CO
2
and VOC concentrations in the room or in the exhaust air
duct.
The CO
2
concentration is evaluated by the sensor. The output signal delivered
(connection terminal U2) is proportional to the CO
2
content of the ambient air.
The number of LEDs lit is proportional to the CO
2
concentration. The poorer the air
quality, the more LEDs are lit.
The acquired VOC concentration is also passed on to a sensor output (connection
terminal U1). The output signal provided is inversely proportional to the concentration of
oxidizable gases (VOCs), such as tobacco smoke, CO, alcohol and body odors. This
means that when the VOC concentration increases, the signal voltage will drop towards
0V, and when the VOC concentration decreases, the signal voltage will rise towards
10V. The AQP63.1 is required to evaluate the output signal.