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Self-calibrating room and duct mounted transmitters provide digitized readings representing 0-2,000 ppm carbon dioxide (CO2) over serial, multi- drop networks through standard BACnet® or Modbus protocols. Available options include temperature and relative humidity sensors, an LCD display, local setpoint adjustment, momentary override switch, and relay output.
To economically sense the concentration of carbon dioxide (CO2) in air for a wide variety of commercial applications, such as demand-controlled ventilation in buildings, schools, theaters, etc., and to transmit the reading to Building Automation System (BAS), direct digital controller (DDC), or other control device through use of a simple, 2-wire, RS-485 interconnection and industry standard BACnet® - or Modbus-MS/TP protocols. I-CDD3 provides for the addition of temperature only or temperature and relative humidity sensing/transmitting, local display of the measurement value(s) adjustment and display of the control setpoint, momentary override switch, and relay output (contact closure when CO2 reading is above setpoint).
- Non-dispersive infrared (NDIR)
- sensing technology
- Self-calibrating
- 2-wire RS-485 multidrop, w/ BACnet-MS/TP or Modbus (RTU or ASCII) protocol
- 0-2,000 ppm CO2
- 0-100% RH sensor (opt.)
- 32 to 95°F sensor (opt.)
- 2-line x 8-character LCD (opt.)
- Local setpoint adjustment (opt.; room only)
- Momentary override (opt.; room only)
- SPST-NO relay output (opt.)
- Integrated end-of-line termination resistor
- Limited five years warranty
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