Rugged device monitors carbon dioxide levels
Dwyer Instruments
The Series CDWP Carbon Dioxide Transmitter (photo) can be utilized to monitor the CO 2 concentration in applications such as HVAC and CO 2 refrigeration mechanical rooms or greenhouse gas applications. It uses a single-beam, dual-wavelength NDIR sensor, which eliminates light source aging effects. The Series CDWP is available in multiple range limits and comes standard with universal outputs of 4–20-mA and 0 to 5 or 10 V d.c., for use with most programmable logic controllers or building-management systems. The device uses a IP54-rated housing, which protects the electronics from dust and splashed water, while the powder-painted, die-cast aluminum housing is said to be an improved material over polycarbonate housings. Its electrical connection allows the user to quickly disconnect the unit from the power and controller, resulting in faster and easier cleaning. — Dwyer Instruments, Inc., Michigan City, Ind.