QPA20 Series Room Air Quality Sensor w/ LCD Display, 0 to 10 Vdc

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. 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). 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