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.

Features:

• Multisensor for CO2/VOC, temperature, and humidity-temperature
• Maintenance-free infrared CO2sensing element, VOC sensing element based on a heated tin dioxide semiconductor
• 24 Vac operating voltage, 0 to 10 Vdc output signals

QPA20… Series Room Air Quality Sensor and
QPA20… Series Room Air Quality Sensor with Display

For more information the Siemens Building Technologies QPA20 series of Room Air Quality Sensors, click here or contact us for a special quote.

The midwestBAS.com Customer Service Team