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  5. Nitrogen Dioxide Sensor, 0-6 PPM Default, (10 PPM Max), Duct Mount, 4-20mA, 2-10VDC Output
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Nitrogen Dioxide Sensor, 0-6 PPM Default, (10 PPM Max), Duct Mount, 4-20mA, 2-10VDC Output
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NO2-Room

Nitrogen Dioxide Sensor, 0-6 PPM Default, (10 PPM Max), Duct Mount, 4-20mA, 2-10VDC Output

  • Parking Garages
  • Arenas
  • Kitchens
  • Laundry Rooms
  • Warehouses
  • Loading Docks
  • Service Garages
  • School Bus Parking Areas
NO2-Room
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NO2-RoomData Sheet

Data Sheet
Nitrogen Dioxide Sensor, 0-6 PPM Default, (10 PPM Max), Duct Mount, 4-20mA, 2-10VDC Output NO2-Room NO2-Room
Product Overview
  • Accuracy ± 2.5 %
  • Applications Access and Parking Control Systems, Building and Maintenance, Commercial and Industrial
  • Coverage Area 7500 sq ft
  • Electrical Life 200,000 cycles minimum with 1A @ 30 VDC
  • Electrical Output 4 to 20 mA, 2 to 10 Vdc
  • Enclosure Material ABS, Polycarbonate
  • Factory Setting 0 to 6 ppm
  • Installation 6 to 18” above the floor
  • LED Indicators Alphanumeric, 2 line X 8 digit LCD / (2) Red LED’s for Relay Status
  • Material Construction Option none
  • Operating Humidity 15 to 90% RH, non-condensing
  • Operating Temperature, Max 104 °F
  • Operating Temperature, Min -4 °F
  • Power Consumption 6.6 W max
  • Repeatability +/- 1% of Reading
  • Response Time Less than 60 Seconds for 90% of step change
  • Sensor Life 2-3 years under Normal Conditions
  • Sensor Type Electrochemical
  • Series ID NO2-Room
  • Shelf Life 6 months
  • Storage Temperature, Max 68 °F
  • Storage Temperature, Min 32 °F
  • Supply Current 250 mA
  • Supply Voltage 22 to 26 Vac/Vdc
  • Tightening Torque 0.37 ft-lbs (0.5n-3m) Nominal
  • Time Delay 0 to 60 min
  • Wire Gauge 26 to 16 AWG

Supported Applications

The ACI NO2 Room Series is designed for the continuous monitoring of nitrogen dioxide (NO₂) levels, specifically targeting vehicle exhaust in non-hazardous areas. The series utilizes a wide spectrum electrochemical sensor to measure environmental concentrations within indoor spaces.

Operating Conditions & Performance

The NO2 Room Series operates across an ambient temperature range of -4°F to 104°F (-20°C to 40°C) and supports humidity levels from 15% to 90% RH continuous (non-condensing), with intermittent tolerance up to 99% RH. The factory-set measurement range is 0 to 6 ppm, which is field adjustable to a maximum of 0 to 10 ppm.

Performance specifications include an accuracy of +/- 2.5% of Reading and repeatability of +/- 1% of Reading. The response time is less than 60 seconds for 90% of a step change. Operating pressure must be maintained at atmospheric +/- 10%. For installations above 3,000 feet elevation, the transmitters require verification for accuracy and recalibration as needed after installation.

Configuration Options

The series is housed in a standard NEMA 1 rated enclosure constructed from Polycarbonate/ABS Blend. The unit dimensions are (H) 6.00" (152.4 mm) x (W) 3.5" (88.9 mm) x (D) 1.09" (27.87 mm), with a weight of 0.62 lbs (281.2 g). Power is supplied via 24 VAC +/- 10% Floating, 24 VAC +/- 10% One side Grounded, or 24 VDC.

Configuration options and features include:

  • Analog Outputs: Jumper selectable between Analog 4-20 mA or 2-10V DC linear signals. Power wiring requires 16 to 26 AWG (0.2 to 1.00 mm²) Shielded Twisted Pair.
  • Display and Indicators: Available with an alphanumeric, 2-line x 8-digit LCD display and two Red LEDs for relay status.
  • Relay Outputs (Optional): Two SPDT Form C dry contact relays rated at 1A @ 30 VDC or 0.5A @ 125 VAC resistive load, with a life expectancy of 200,000 cycles minimum.
  • Buzzer (Optional): Integrated buzzer rating of 85 dB at one foot.
  • Time Delays: Configurable actuation and de-actuation delays from 0 to 60 minutes in 5-minute increments.
  • Sensor Life: Electrochemical sensor life is rated for 2–3 years under normal conditions, with a unit shelf life of 6 months from the date of purchase.

The series supports mounting heights between 6 to 18 inches above the floor and covers an area up to 7500 sq. ft (49' radius). Accessories include Calibration Adapter (Model # 83830-020-000), Replacement NO₂ Sensing Element (Model # 6300-0035), and a Gas Cal Kit.

Key Product Differences

The series is offered in two primary configurations:

  • NO2-R: Standard Room Mount with the standard room enclosure, providing analog output without integrated display or relays.
  • NO2-R-RB-D: NO₂ Room Mount equipped with an LCD Display, two SPDT Relays, and a Buzzer within the standard room enclosure.

The series is not compatible with Q4C II, M-Controller2, or Q-Controller systems. Modbus RTU communication is also not supported by this product line.

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