O3-A4 Ozone Sensor Ozone 4-Electrode 4-Electrode Technical Specification Figure 1 O3-A4 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 1ppm O3 maximum ppm for stable response to gas pulse * Tested with Alphasense AFE 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 % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ % measured gas @ KEY SPECIFICATIONS Temperature range Pressure range Humidity range Flow rate Bias voltage Storage period Load resistor Weight °C kPa % rh non-condensing minimum sccm during calibration V months @ 3 to 20°C (stored in sealed pot) Ω (AFE circuit is recommended) g 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

Perf erfomance Data O3-A4 Perfomance Data 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 400 350 300 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 Response to 200ppb Ozone 420 410 Figure 4 shows response to 200ppb O3. Use of Alphasense AFE circuit reduces noise to 5ppb, with the opportunity...