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OX-B431 Oxidising Gas Sensor

OX-B431 Oxidising Gas Sensor

Product catalog summary

Overview: The OX-B431 is an oxidising gas sensor designed to detect ozone (O3) and nitrogen dioxide (NO2). It features a 4-electrode design and is suitable for various environmental conditions.

Specifications:

Performance: Sensitivity ranges from -225 to -650 nA/ppm for O3 and -250 to -650 nA/ppm for NO2. The response time is less than 45 seconds for O3 and less than 35 seconds for NO2. The sensor has a noise level of 15 ppb equivalent and a linearity error of less than ±0.5 ppm at full scale.
Lifetime: The sensor has a zero drift of 0 to 20 ppb equivalent change per year and a sensitivity drift of less than -20 to -40% change per year. The operating life is over 24 months.
Environmental Conditions: The sensor operates within a temperature range of -30 to 40°C, a pressure range of 80 to 120 kPa, and a humidity range of 15 to 85% RH.
Cross Sensitivity: The sensor shows varying sensitivity to other gases such as H2S, NO, Cl2, SO2, CO, C2H4, NH3, H2, CO2, and Halothane, with specific percentage sensitivities provided for each.

Figures and Data:

Figure 1: Schematic diagrams of the sensor from different views.
Figure 2: Shows temperature dependence of sensitivity at 1ppm O3.
Figure 3: Illustrates zero temperature dependence.
Figure 4: Displays response from 200 ppb to 0 ppb O3.
Figure 5: Shows temperature dependence of sensitivity at 2ppm NO2.
Figure 6: Demonstrates response to 50ppb NO2.
Figure 7: Shows response from 200 ppb to 0 ppb NO2.

Recommendations: Users should test the sensors under their own conditions to ensure suitability. The document advises correcting signals for electronic zero offset, sensor zero offset, temperature dependence, and sensitivity calibration before calculating ozone concentration.

Additional Information: Alphasense reserves the right to change design features and specifications without prior notification. The document is for guidance only, and Alphasense accepts no liability for any consequential losses, injury, or damage resulting from its use.

Catalog excerpts

OX-B431 Oxidising Gas Sensor Ozone + Nitrogen Dioxide 4-Electrode Figure 1 OX-B431 Schematic Diagram Auxiliary Electrode Top View Bottom View Side View Specification O3 Sensing PERFORMANCE Sensitivity Response time Zero current Noise* Range Linearity Overgas limit nA/ppm at 1ppm O3 t90 (s) from zero to 1ppm O3 nA in zero air at 20°C ±2 standard deviations (ppb equivalent) ppm O3 limit of performance warranty ppm error at full scale, linear at zero and 20ppm O3 maximum ppm for stable response to gas pulse * Tested with Alphasense AFE low noise circuit LIFETIME Zero drift ppb equivalent change/year in lab air Sensitivity drift % change/year in lab air, monthly test Operating life months until 50% original signal (24 month warranted) 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 Pressure range Humidity range Storage period Load resistor Weight °C kPa % rh continuous months @ 3 to 20°C (stored in sealed pot) Q (AFE circuit recommended) g 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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OX-B431 Performance Data Figure 4 Response from 200 ppb to 0 ppb O3 340 330 320 310 ^ 300 290 280 £ 270 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. Figure 4 shows response from 200ppb O3 to 0ppb O3. 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 ISB circuit electronic offset. In the...

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OX-B431 Oxidising Gas Sensor Ozone + Nitrogen Dioxide _4-Electrode_ Patented The OX-B431 detects both ozone and nitrogen dioxide (O3 +NO2). The NO2-B43F measures only nitrogen dioxide, filtering out ozone. Using these sensors together allows you to calculate the O3 concentration by subtracting the corrected NO2-B43F concentration from the corrected OX-B431 concentration. Before subtracting to determine ozone concentration, ensure that the signals from the two sensors have been corrected for electronic zero offset, sensor zero offset and temperature dependence, and sensitivity (nA/ppm) calibration...

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Perf erformance Data OX-B431 Performance Data Figure 5 Sensitivity temperature dependence to 2ppm NO2 Figure 5 shows the temperature dependence of sensitivity at 2ppm NO2. This data is taken from a typical batch of sensors. Figure 6 shows the fast response and good baseline recovery of the OX-B431 to 50ppb NO2. Figure 7 Response from 200 ppb to 0 ppb NO2 300 Figure 7 shows response from 200ppb NO2 to 0ppb NO2. Use of Alphasense AFE circuit reduces noise to 15ppb, with the opportunity of digital smooting to reduce noise to less than ± 5ppb. Technical Specification Offset voltage is due to intentional...

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OX-B431 Oxidising Gas Sensor

OX-B431 Oxidising Gas Sensor

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