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O3-A4

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O3-A4

Product catalog summary

Performance Specifications

Sensitivity: -200 to -400 nA/ppm at 100ppb O₃
Response Time: Less than 15 seconds from zero to 100ppb
Zero Current: 10 to 30 nA in zero air at 20°C
Noise: ±2 standard deviations equivalent to 5ppb
Range: Performance warranty limit at 5ppm O₃
Linearity: 200 to 500 ppb error at full scale
Overgas Limit: Stable response up to 10ppm

Lifetime Specifications

Zero Drift: 0 to 50 ppb equivalent change per year
Sensitivity Drift: -20% to -35% change per year
Operating Life: Greater than 18 months until 50% of original signal

Environmental Specifications

Temperature Sensitivity: Data provided for -20°C and 50°C at 500ppb O₃
Zero Temperature Change: -10 to -30 nA at -20°C; 170 to 360 nA at 50°C

Cross Sensitivity

H₂S: Less than -70% at 5ppm
NO₂: 70% to 120% at 5ppm
Cl₂: Less than 30% at 5ppm
NO: Less than -5% at 5ppm
SO₂: Less than -4% initial transient at 5ppm
CO: Less than 0.1% at 5ppm
H₂: Less than 2% at 100ppm
C₂H₄: Less than 0.1% at 100ppm
NH₃: Less than 1% at 20ppm
CO₂: Less than 0.1% at 5%

Key Specifications

Temperature Range: -20°C to +50°C
Pressure Range: 80 to 120 kPa
Humidity Range: 15% to 85% RH non-condensing
Flow Rate: Minimum 500 sccm during calibration
Bias Voltage: 0 V
Storage Period: 6 months at 3 to 20°C
Load Resistor: 33 to 100 Ω
Weight: Less than 6 g

Figures and Diagrams

Figure 1: O3-A4 Schematic Diagram
Figure 2: Sensitivity Temperature Dependence
Figure 3: Zero Temperature Dependence
Figure 4: Response to 200ppb Ozone

Additional Notes

All sensors are tested at ambient conditions with a 47 ohm load resistor unless otherwise stated. Customers should test under their own conditions to ensure suitability. For disposal instructions, contact Alphasense or its distributor.

Catalog excerpts

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

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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...

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