Carbon dioxide transmitter with temperature sensor for active space and zone ventilation and temperature control attractive wall mount case with display for temperature and CO2 levels. No-Display version also available. Self-calibrating sensor eliminates calibration/ maintenance requirements. Easy to install duct mount version with 8" aspiration probe. (No tubes to plug or clean.) Easy choice of voltage or current via jumper selection, relay output also available. Display, output range and scaling easily customized via a PC interface. Add-on options for Lonworks®, RS-485 network connection or 2000 point data logger. Gold plated optical sensor ensures long-term durability and stability. Purposefully built for quality - designed and built using Internationally Certified ISO 9001 processes.