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

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

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

Data Sheet
Nitrogen Dioxide Sensor, 0-6 PPM Default, (10 PPM Max), Wall Mount, 4-20mA, 2-10VDC Output NO2-Duct NO2-Duct
Product Overview
  • Accuracy ± 2.5 %
  • Applications Access and Parking Control Systems, Building and Maintenance, Commercial and Industrial
  • Calibration Note Equipment Needed For Calibration: 0.5 lpm Regulator, zero & span gas (supplied by local vendor) Calibration adapter (Part # 83830-020-000)
  • Compatible Sensors Note Replacement NO2 Sensor: Part# 6300-0035
  • 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
  • Filter 5 micron
  • 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
  • Pitote Tube 3 5/32 in
  • 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-Duct
  • 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
  • Tube Length 18 in
  • Tube Material Vinyl
  • Wire Gauge 26 to 16 AWG

Supported Applications

The ACI NO2 Duct 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 gas concentration in environments such as parking garages, arenas, warehouses, loading docks, service garages, and school bus parking areas.

Operating Conditions & Performance

The NO2 Duct Series operates within an ambient temperature range of -4°F to 104°F (-20°C to 40°C) and a humidity rating of 15 to 90% RH continuous, non-condensing; or 0 to 99% RH intermittent, non-condensing. The device is rated for atmospheric pressure +/- 10%. Performance specifications include an accuracy of +/- 2.5% of Reading and repeatability of +/- 1% of Reading. Response time is less than 60 seconds for 90% of a step change.

The factory-set measurement range is 0 to 6 ppm, with field-adjustable capability up to 0 to 10 ppm. The electrochemical sensor has an expected life of 2-3 years under normal conditions. Storage temperature requirements are 32°F to 68°F, and the unit shelf life is 6 months from the date of purchase.

Configuration Options

The series offers configurable output signals and optional alarm features housed in a rugged enclosure constructed from Polycarbonate/ABS Blend (Fire Retardant) with a NEMA 1 rating. The standard model provides analog outputs, while an enhanced variant includes display and relay capabilities.

  • Output Signals: Jumper selectable between 4-20 mA or 2-10 VDC linear.
  • Housing & Mounting: Wall mount enclosure with dimensions (H) 6.00" (152.4 mm) x (W) 3.5" (88.9 mm) x (D) 1.6" (40.6 mm).
  • Power Supply: Accepts 24 VAC +/- 10% Floating; 24 VAC +/- 10%, One side Grounded; or 24 VDC.
  • Optional Features: Available with an alphanumeric, 2-line x 8-digit LCD display, two SPDT Form C relays (Dry Contact), and a buzzer rated at 85 dB @ one foot.
  • Duct Sampling Kit Components: Includes vinyl tubing (18" length), a 3 5/32" Polycarbonate/ABS Blend Pitot Tube, and an in-line filter with 5 micron rating.

Key Product Differences

The series is distinguished by the inclusion of display and alarm hardware. The standard model (NO2-D) provides analog output signals without local indication or relay contacts. The variant NO2-D-RB-D includes an LCD display, two SPDT Form 1C relays with configurable setpoints for warning and alarm functions, time delays from 0 to 60 minutes in 5-minute increments, and a buzzer.

Both models utilize the same electrochemical sensing element (Part # 6300-0035) and require calibration using zero and span gases with Part # 83830-020-000 Calibration Adapter. The series is not compatible with Q4C II, M-Controller2, or Q-Controller systems, nor does it support Modbus RTU communication.

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