Siemens QPA20 Series Room Air Quality Sensors


The QPA20… series room air quality sensors optimize room comfort by enabling demand-controlled ventilation. The sensors can acquire: CO₂ and volatile organic compound (VOC) concentrations, relative humidity, and temperature. Models are available for CO₂, CO₂/VOC, CO₂/T, and CO₂/T/RH.
The sensor evaluates the CO₂/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:
• CO₂ in ppm
• CO₂ 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 CO₂/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 1 | Table 2 | Table 3 | Table 4 | Table 5 | Table 6 | Table 7 | Table 8 |
X | X | X | X | X | X | X | X |
Table 1 | Type |
UNIVERSAL SENSOR PROGRAM | |
Q | SENSOR |
Table 2 | MEASURING FAMILY |
P | CO2/VOC |
Table 3 | APPLICATION/LOCATION |
A | ROOM |
Table 4 | SENSOR TYPE |
2 | CO2 |
Table 5 | TEMPERATURE OUTPUT SIGNAL |
6 | 0 TO 10 VOLT |
Table 6 | RH SIGNAL PRESENT |
2 | CO2/VOC AND RH: 0 TO 10 VOLT |
Table 7 | SEPARATOR |
- | - |
Table 8 | FEATURE DESCRIPTION - ROOM TYPES |
D | WITH 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) |