• Sensitivity: 55 to 80 nA/ppm in 400ppm SO₂
• Response Time: Less than 25 seconds from zero to 400ppm SO₂
• Zero Current: Less than 5 ppm equivalent in zero air
• Resolution: RMS noise less than 1.5 ppm equivalent
• Range: Performance warranty up to 2,000 ppm
• Linearity: Error at full scale from 0 to -80 ppm
• Overgas Range: Stable response to gas pulse up to 10,000 ppm

• Zero Drift: Not determined (nd) change/year in lab air
• Sensitivity Drift: Less than 2% change/month in lab air
• Operating Life: More than 24 months until 80% of original signal (24-month warranty)

• At -20°C: 80 to 92% output compared to 20°C at 400ppm
• At 50°C: 98 to 108% output compared to 20°C at 400ppm
• Zero Change at -20°C: Less than ±7 ppm equivalent from 20°C
• Zero Change at 50°C: Less than 0 to 7 ppm equivalent from 20°C

• Filter Capacity: 5,000 ppm·hrs for H₂S
• NO Sensitivity: 150% at 500ppm NO
• NO₂ Sensitivity: -140% at 10ppm NO₂
• Cl₂ Sensitivity: Not determined (nd) at 10ppm Cl₂
• H₂ Sensitivity: Not determined (nd) at 400ppm H₂
• CO Sensitivity: Not determined (nd) at 400ppm CO
• C₂H₄ Sensitivity: 75% at 1000ppm C₂H₄
• NH₃ Sensitivity: Less than 0.1% at 20ppm NH₃

• Temperature Range: -30 to 50°C
• Pressure Range: 80 to 120 kPa
• Humidity Range: 15 to 90% rh continuous
• Storage Period: 6 months at 3 to 20°C (stored in sealed pot)
• Load Resistor: Recommended 10 to 47 Ω
• Weight: Less than 6 g

• Figure 2: Shows sensitivity variation with temperature changes.
• Figure 3: Indicates zero offset is insensitive to temperature above -10°C.
• Figure 4: Demonstrates response to step changes up to 10,000 ppm SO₂, showing substantial linearity over the range.

All sensors are tested under ambient conditions with a 10-ohm load resistor unless otherwise stated. Customers are advised to test sensors under their own conditions to ensure suitability for their requirements. Alphasense Ltd reserves the right to change design features and specifications without prior notification.