Series 100/200/300
Wall-mounted RS-485 Combination Sensor with CO₂ and/or Relative Humidity/Temperature Capabilities
RoHS 2 Compiant


Series 100/200/300
Wall-mounted RS-485 Combination Sensor with CO₂ and/or Relative Humidity/Temperature Capabilities

The IAQSENS family of wall mounted devices simplifies wiring and installation by providing up to three sensors over a single RS-485 connection. The device is available as a stand-alone CO₂ sensor, dual output RH/Temperature sensor or a combination of all three.

  • Up to 3 Sensors in One Package
  • Telaire NDIR CO₂ Sensor
  • Planar Capacitive Polymer RH Sensor
  • Integral Bandgap PTAT Temp. Sensor
  • Accurate Measurement
  • Reliable Design
  • RS-485 BACnet/Modbus Connection
  • BTL Listed
  • Attractive Wall-mount Enclosure
  • 1-year Warranty

Typical Applications

  • Room CO₂, Relative Humidity and Temperature Monitoring
  • CO₂ Demand Control Ventilation (DCV)
  • CO₂/Airflow* Population Estimation DCV
* When an Airflow Monitoring Device is provided.


  • Reset Outdoor Airflow Rates
  • Save Energy
  • Satisfy LEED Requirements
  • Combine with an Airflow Measuring Device for ASHRAE 62.1 and 90.1 Compliant DCV

Product Highlights

  • Self-calibrating ABC Logic Circuitry for CO₂ Measurement
  • Microprocessor-based
  • Watchdog Circuit Protection
  • Time-tested Network Firmware
  • Simple DIP switch network configuration


Sensor Configurations

CO₂ only – IAQ-N100-W
RH and Temperature only – IAQ-N200-W
CO₂, RH and Temperature – IAQ-N300-W 

Listings and Compliance

BACnet International: BTL Listed
FCC: This device complies with Part 15 of the FCC rules
RoHS: This device is RoHS2 compliant

Environmental Limits (Recommended)

Temperature: 32 to 122 ⁰F [0 to 50 °C]
Humidity: 5 to 95%


CO₂ Sensor

Technology: Telaire 6613 Non Dispersive Infrared (NDIR)
Range: 0 to 2,000 ppm
Accuracy: 400 to 1,250 ppm ±30 ppm or 3% or reading, whichever is greater 1,250 to 2,000 ppm ±30 ppm
Temperature Dependence: 0.36% FS/°F [0.2% FS/°C]
Stability: <2% of FS over life of sensor (15 year typical)
Calibration Interval: Not required
Response Time: <2 minutes for 90% step change typical

Temperature Sensor

Technology: Integral Bandgap PTAT
Range: 32 to 122 ⁰F [0 to 50 °C]
Accuracy: ±1.08 ⁰F [0.6ºC] @77 ⁰F [25 °C]
Resolution: 0.36 ⁰F [0.2 °C]

Relative Humidity Sensor

Technology: Planar Capacitive Polymer
Range: 0 to 100% RH
±3% <20% RH
±2% 20% to 80% RH
±3% >80% RH
Resolution: 0.4% RH

Integral Transmitter

Power Requirement: 24 VAC (22.8 to 26.4 under load) @1.5V-A
Printed Circuit Boards: Electroless nickel immersion gold (ENIG) plated
User Interface: DIP switch
B.A.S. Connectivity Options
IAQ-N100, IAQ-N200, IAQ-N300 Transmitters: One field selectable (BACnet MS/TP or Modbus RTU) and non-isolated RS-485 network connection (provide individual 24 VAC transformers at each IAQ-Ny00 for applications requiring isolated RS-485).
Supported Baud Rates: 9.6, 19.2, 38.4 and 76.8 Kbaud
System Status Alarm
Type: Sensor diagnostic system trouble indication
Visual Indication: Yes, LED indication
Network Indication: Yes


Dimensions: 4.56H x 3.25W x 1.09D in. [115.8 x 82.6 x 27.7 mm]

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