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O3-B4

Product catalog summary

Performance Specifications
The O3-B4 Ozone Sensor exhibits a sensitivity range of -250 to -550 nA/ppm at 100ppb O3, with a response time of less than 15 seconds from zero to 100ppb. The zero current in zero air at 20°C ranges from 0 to 120 nA, and noise is measured at ±2 standard deviations, equivalent to 4ppb. The sensor's performance warranty covers up to 5ppm O3, with linearity errors ranging from 0 to 200ppb at full scale. The overgas limit is set at a maximum of 10ppm for stable response to gas pulses.

Lifetime and Drift
The sensor's zero drift is 0 to 50ppb equivalent change per year in lab air, with a sensitivity drift of -20% to -35% change per year. The operating life extends beyond 18 months until the signal reaches 50% of its original value, with a 12-month warranty.

Environmental Conditions
The sensor operates effectively within a temperature range of -20°C to +50°C, a pressure range of 80 to 120 kPa, and a humidity range of 15% to 85% relative humidity (non-condensing). The minimum flow rate during calibration is 500 sccm (0.5L/m).

Cross Sensitivity
The sensor's cross sensitivity to various gases is as follows: H2S sensitivity is less than 90% at 5ppm, NO2 sensitivity ranges from 60% to 120% at 5ppm, Cl2 sensitivity is less than 50% at 10ppm, NO sensitivity is less than 4% at 1ppm, SO2 sensitivity is less than -5% at 5ppm, CO sensitivity is less than 0.1% at 10ppm, H2 sensitivity is less than 1% at 100ppm, C2H4 sensitivity is less than 0.1% at 400ppm, NH3 sensitivity is less than 1% at 20ppm, and CO2 sensitivity is less than 0.1% at 5% CO2.

Key Specifications
The sensor requires a bias voltage of 0V and a load resistor of 33 to 100 ohms (ISB circuit recommended). It weighs less than 13 grams and should be stored for up to 6 months at 3 to 20°C in a sealed pot.

Figures and Data Interpretation
Figures included in the document illustrate the sensor's performance data, including temperature dependence of sensitivity, zero temperature dependence, and the effect of humidity on sensor output. The use of the Alphasense ISB circuit reduces noise to 4ppb, with potential for further digital smoothing.

Additional Notes
All sensors are tested under ambient environmental conditions with a 10-ohm load resistor unless otherwise stated. Customers are advised to test sensors under their own conditions to ensure suitability for specific applications. Disposal instructions for electronic sensors are provided by Alphasense or its distributors.

Catalog excerpts

Ozone O3-B4 Ozone Sensor 4-Electrode 4-Electrode Technical Specification Figure 1 O3-B4 Schematic Diagram Top View PERFORMANCE Sensitivity Response time Zero current Noise* Range Linearity Overgas limit Bottom View Side View nA/ppm at 100ppb O3 t90 (s) from zero to 100ppb nA in zero air at 20oC ±2 standard deviations (ppb equivalent) ppm O3 limit of performance warranty ppb error at full scale, linear at zero and 2ppm O3 maximum ppm for stable response to gas pulse * Tested with Alphasense ISB low noise circuit LIFETIME Zero drift Sensitivity drift Operating life ppb equivalent change/year in lab air % change/year in lab air, monthly test months until 50% original signal (12 month warranted) ENVIRONMENTAL Sensitivity @ -20°C Sensitivity @ 50°C Zero @ -20°C Zero @ 50°C CROSS SENSITIVITY H2S sensitivity NO2 sensitivity Cl2 sensitivity NO sensitivity SO2 sensitivity CO sensitivity H2 sensitivity C2H4 sensitivity NH3 sensitivity CO2 sensitivity KEY SPECIFICATIONS Temperature range Pressure range Humidity range Flow rate Bias voltage Storage period Load resistor Weight % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ °C kPa % rh non-condensing minimum sccm during calibration V months @ 3 to 20°C (stored in sealed pot) Ω (ISB circuit is recommended)) g NOTE: all sensors are tested at ambient environmental conditions, with 10 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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Perf erformance Data O3-B4 Performance Data Figure 2 Sensitiivity Temperature Dependence % Output (referenced to 20oC) Figure 2 shows the temperature dependence of sensitivity at 100ppb O3. This data is taken from a typical batch of sensors. Figure 3 Zero Temperature Dependence (corrected) 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 to 200ppb O3. Use of Alphasense ISB circuit...

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