Macurco CX-12 Carbon Monoxide and Nitrogen Dioxide Monitor, Line Voltage 100-240 VAC, Detector Controller and Transducer

Macurco CX-12 — line voltage fixed monitor that detects both carbon monoxide and nitrogen dioxide, and serves as detector, controller and transducer.

Parking garages take carbon monoxide from petrol engines and nitrogen dioxide from diesel ones, so a garage serving both needs both watched. The CX-12 carries a sensor for each and drives an exhaust fan through a relay. In this number the 12 is the supply: it runs from mains where the CX-6 runs from low voltage.

• Displays 0 to 200 ppm CO and 0 to 20 ppm NO₂ on a four digit LED readout
• Power 100-240 VAC, 50 to 60 Hz, 1.0 A maximum
• 5 A SPDT fan relay at 240 VAC pilot duty, with selectable set points
• Alarm relay 0.5 A at 120 V, 60 VA, selectable normally open or closed; 4 to 20 mA loop, in dual mode when it feeds a Macurco DVP panel
• Field replaceable sensors with end of life notification
• 0 °F to 125 °F; mounts on a 4 × 4 electrical box, not supplied

The single gas members carry the gas in the number: CX-12-CO is carbon monoxide only and CX-12-NO2 nitrogen dioxide only. CX-6 and its variants are the low voltage twins, and Macurco states the ETL listing to UL 2075 for the CX-6 models only, calling the CX-12 designed to meet it.