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NO2-A43F Nitrogen Dioxide Sensor

NO2-A43F Nitrogen Dioxide Sensor

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NO2-A43F Nitrogen Dioxide Sensor

Product catalog summary

Performance Specifications:

Sensitivity: -175 to -450 nA/ppm at 2ppm NO₂.
Response Time: Less than 60 seconds from zero to 2ppm NO₂.
Zero Current: -50 to +70 nA in zero air at 20°C.
Noise: ±2 standard deviations equivalent to 15 ppb.
Range: Performance warranty limit at 20 ppm NO₂.
Linearity: Error less than ±0.5 ppm at full scale.
Overgas Limit: Stable response up to 50 ppm gas pulse.

Lifetime Specifications:

Zero Drift: 0 to 20 ppb equivalent change per year in lab air.
Sensitivity Drift: Less than -20 to -40% change per year in lab air.
Operating Life: More than 24 months until 50% of original signal.

Environmental Specifications:

Sensitivity at -20°C: 40 to 80% output compared to 20°C at 2ppm NO₂.
Sensitivity at 40°C: 95 to 115% output compared to 20°C at 2ppm NO₂.
Zero at -20°C: 0 to +25 nA.
Zero at 40°C: 20 to 60 nA.

Cross Sensitivity:

O₃ Filter Capacity: Greater than 500 ppm hours at 2ppm O₃.
H₂S Sensitivity: Less than -80% at 5ppm H₂S.
NO Sensitivity: Less than 5% at 5ppm NO.
Cl₂ Sensitivity: Less than 75% at 5ppm Cl₂.
SO₂ Sensitivity: Less than -5% at 5ppm SO₂.
CO Sensitivity: Less than -5% at 5ppm CO.
C₂H₄ Sensitivity: Less than 1% at 100ppm C₂H₄.
NH₃ Sensitivity: Less than 0.2% at 20ppm NH₃.
H₂ Sensitivity: Less than 0.1% at 100ppm H₂.
CO₂ Sensitivity: 0.1% at 5% Vol CO₂.
Halothane Sensitivity: Not detected at 100ppm Halothane.

Key Specifications:

Temperature Range: -30 to 40°C.
Pressure Range: 80 to 120 kPa.
Humidity Range: 15 to 85% rh continuous.
Storage Period: 6 months at 3 to 20°C in a sealed pot.
Load Resistor: 33 to 100 Ω (AFE circuit recommended).
Weight: Less than 6 grams.

Figures and Diagrams:

Figure 1: NO₂-A43F Schematic Diagram with dimensions.
Figure 2: Sensitivity temperature dependence graph.
Figure 3: Zero temperature dependence graph.
Figure 4: Response from 200 ppb to 0 ppb NO₂.

Note: All sensors are tested under ambient conditions with a 47 ohm load resistor unless otherwise stated. Disposal instructions are provided by Alphasense or its distributor.

Catalog excerpts

NO2-A43F Nitrogen Dioxide Sensor 4-Electrode Patented All dimensions in millimetres (± 0.15mm) Bottom View Side View Response time t90 (s) from zero to 2ppm NO2 < 60 Zero current nA in zero air at 20°C -50 to +70 Noise* ±2 standard deviations (ppb equivalent) 15 Range ppm NO2 limit of performance warranty 20 Linearity ppm error at full scale, linear at zero and 20ppm NO2 < ±0.5 Overgas limit maximum ppm for stable response to gas pulse 50 * Tested with Alphasense AFE low noise circuit LIFETIME Zero drift ppb equivalent change/year in lab air 0 to 20 Sensitivity drift % change/year in lab air, monthly test < -20 to -40 Operating life months until 50% original signal (24 month warranted) > 24 Filter capacity (ppm hrs) sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas sensitivity % measured gas KEY SPECIFICATIONS Temperature range °C -30 to 40 Humidity range % rh continuous 15 to 85 Storage period months @ 3 to 20°C (stored in sealed pot) 6 Load resistor Q (AFE circuit recommended) 33 to 100 At the end of the product’s life, do not dispose of any electronic sensor, component or instrument in the domestic waste, but contact the instrument manufacturer, Alphasense or its distributor for disposal instructions. NOTE: all sensors are tested at ambient environmental conditions, with 47 ohm load resistor, unless otherwise stated. As applications of use are outside our control, the information provided is given without legal responsibility. Customers should test under their own conditions, to ensure that the sensors are suitable for their own requirements. Alphasense Ltd, Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. CM77 7AA. UK Telephone: +44 (0) 1376 556 700 Fax: +44 (0) 1376 335 899 E-mail: [email protected] Website: www.alphasense.com

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Figure 4 shows response from from 200ppb NO2 to 0ppb NO2. Use of Alphasense AFE circuit reduces noise to 15ppb, with the opportunity of digital smooting to reduce noise even further. Offset voltage is due to intentional AFE circuit electronic offset. NO2-A43F Performance Data Figure 3 Zero temperature dependence Figure 3 shows the variation in zero output of the working electrode caused by changes in temperature, expressed as nA. This data is taken from a typical batch of sensors. Contact Alphasense for futher information on zero current correction. For further information on the performance...

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