The SERIES CDT Carbon Dioxide and Temperature Transmitters accurately monitor the CO2 concentration and temperature in indoor environments to help achieve energy savings. For increased sensor accuracy, a single beam dual wavelength nondispersive infrared (NDIR) sensor is used to automatically correct the measurement in both occupied* and unoccupied buildings against light source aging effects. The single beam dual wavelength sensor technology provides the highest level of accuracy compared to Automatic Baseline Correction methods. The Series CDT includes digital barometric pressure adjustment and the ability to field-calibrate the sensor. Wall mount configurations of the Series CDT can be ordered with an integral LCD display. Push buttons are standard on all configurations of the transmitters for access to the menu structure, but wall mount configurations can be ordered without the buttons. To prevent tampering, the action of the buttons can be locked out using an internal dip switch selection. APPLICATIONS: Demand control ventilation in schools, office buildings, hospitals, and other indoor environments; LEED certification. SPECIFICATIONS: Sensor: Single beam, dual-wavelength NDIR. Range: CO2: 0 to 2000 or 0 to 5000 ppm (depending on model); Temp: 32 to 122°F (0 to 50°C). Accuracy: CO2: ±40 ppm ±3% of reading; RH: ±2% (10 to 90% RH); Temp: ±1°C @ 25°C. Temp: ±1°C @ 25°C. Temp Dependence: ±8 ppm/°C at 1100 ppm. Non-Linearity: 16 ppm. Pressure Dependence: 0.13% of reading per mm of Hg. Response Time: 2 min for 99% step change. Duct Air Velocity Range: 0-4000 FPM (20.32 m/s). Temp Limits: 32 to 122°F (0 to 50°C). Humidity Limits: 10 to 95% RH (non-condensing). Power Rqs: 16 to 35 VDC or 19 to 28 VAC. Power Consumption: Average: 2 w; Peak: 3.75 w. Output: Current: 4 to 20 mA (max 500 Ω); Voltage: 0 to 5 VDC or 0 to 10 VDC (min 500 Ω); Relay: SPST NO 2 A @ 30 VDC; Weight: 4.4 oz (125 g). Enclosure Rating: IP20. Agency Approvals: CE.