For Duct

● Selectable output 0-10 Vdc or 4-20 mA
● Modbus RS485 communication interface
● Measures 0-2.000 ppm
● Power supply 24 Vac/dc
● Accuracy +/-40 ppm or 3% of reading
● Fifteen years lifetime,
● calibrate themselves to local background levels

Options:
● Humidity + Temperature outputs
● LCD display to display
CO2 + Humidity + Temperature measurements