The Telaire/Amphenol Advanced Sensors T8000 Series Ventostat CO2/RH/Temperature Transmitter is the next generation CO2 sensors. Each Ventostat comes with a passive 10kΩ Type II thermistor and has simultaneously active voltage and current outputs for CO2 measurement. The T8100 and T8300 features reliable automatic calibration using patented Telaire ABC logic that will ensure accurate and stable calibration for the lifetime of the sensor. The T8200 offers an accurate solution for hospitals and other full time operational 24 hours a day facilities. Both the T8100 and the T8200 are available with optional and selectable analog humidity and temperature outputs. The T8300 offers all of the accuracy of the T8100 but utilizes a pitot tube kit for measuring duct levels of CO2. Feature: Simultaneous voltage and current outputs for CO2 Maintenance free lifetime self-calibration Passive temperature output Non-dispersive infrared sensor Ideal for 24 hours per day facilities (T8200) Optional display available Optional active temperature and humidity outputs Relay and Night setback models Lifetime warranty with single channel ABC logic