The Telaire T8000-Series with on-board relay and splash-resistant enclosure is a dual-channel sensor with an active temperature channel (10 K ohm thermistor). Is provided with field-selectable voltage or current output (0 – 5 V or 0 – 10 V, also field-selectable); CO₂ measurement range up to 20,000 ppm; available in European-style or US-style enclosure (white or black). The Telaire T1505 splash-resistant enclosure protects the transmitter (transmitter sold separately) in damp or wet environments. The enclosure is designed to protect the transmitter from dripping or sprayed water. The transparent cover allows for viewing of the transmitter display. The enclosure is provided with four diffusion ports to allow entry of CO₂ and has knockouts for conduit connection.