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Siemens QPA20 Series Room Air Quality Sensors

Room Air Quality Sensors
QPA20 Series

The QPA20… series room air quality sensors optimize room comfort by enabling demand-controlled ventilation. The sensors can acquire: CO and volatile organic compound (VOC) concentrations, relative humidity, and temperature. Models are available for CO, CO/VOC, CO/T, and CO/T/RH.

The sensor evaluates the CO/VOC concentrations and transforms it to a 0 to 10 Vdc linear proportional output signal.

For models with humidity, a capacitive humidity sensing element changes capacitance as a function of the relative humidity. An electronic measuring circuit converts the humidity signal to a continuous 0 to 10 Vdc signal that corresponds to a relative humidity range of 0 to 100%. For models with temperature, the sensor acquires room temperature with a sensing element that changes electrical resistance as a function of the temperature. The resistance is converted to an active 0 to 10 Vdc output signal that corresponds to a temperature range of 32°F to 122°F (0°C to 50°C) or -31°F to 95°F (−35°C to 35°C).

Sensors with an LCD window display the following measured values:

• CO in ppm
• CO and VOC as a bar chart (4 bars ≈ 2V, 20 bars ≈ 10V)
• Temperature in °C or °F
• Relative humidity in %
The wall-mounted sensors are suited for use with all systems and devices capable of acquiring and handling a 0 to 10 Vdc output signal.

• Multi-sensor for CO/VOC, temperature, and humidity-temperature
• Maintenance-free infrared CO₂ sensing element, VOC sensing element based on a heated tin dioxide semiconductor
• 24 Vac operating voltage, 0 to 10 Vdc output signals

Select a link under the "item" tab below to order.

Table 1Table 2Table 3Table 4Table 5Table 6Table 7Table 8
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Table 1Type
UNIVERSAL SENSOR PROGRAM
QSENSOR
Table 2MEASURING FAMILY
PCO2/VOC
Table 3APPLICATION/LOCATION
AROOM
Table 4SENSOR TYPE
2CO2
Table 5TEMPERATURE OUTPUT SIGNAL
60 TO 10 VOLT
Table 6RH SIGNAL PRESENT
2CO2/VOC AND RH: 0 TO 10 VOLT
Table 7SEPARATOR
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Table 8FEATURE DESCRIPTION - ROOM TYPES
DWITH LCD DISPLAY
Power Supply
Operating voltage (SELV) 24 Vac ±20%
Frequency 50/60 Hz
Power consumption ≤2 VA
Electrical
Screw terminals 2 × 16 AWG or 1 × 14 AWG
Environmental
Temperature Operating: 23°F to 113°F (-5° to 45°C)
Storage: -13°F to 158°F (-25° to 70°C)
Humidity Operating: 0 to 95% rh (non-condensing)
Storage: <95% rh
Physical
Mounting In 2 × 4 inch (5 × 10 cm) electrical conduit box
Weight in lb (kg) Without display: 0.22 lb (0.10 kg)
With display: 0.26 lb (0.12 kg)


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