The Belimo 22G02-5A CO Gas Monitor is a carbon monoxide detection device designed for compatible HVAC ventilation and building automation systems. It monitors CO concentrations within a 0–250 ppm range and communicates readings through CAN bus or BACnet MS/TP protocols. When configured thresholds are reached, its SPDT auxiliary switch and relay can support alarms or ventilation contro... https://www.partshnc.com/belimo-22g02-5a-carbon-monoxide-gas-monitor-can-bus-bacnet