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CH-A3 Flammable Gas Sensors

CH-A3 Flammable Gas Sensors

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CH-A3 Flammable Gas Sensors

Product catalog summary

Performance Specifications

Sensitivity: 21 to 24 mV/% methane.
Response Time: t90 from air to 50% LEL methane is less than 15 seconds.
Zero mV in Zero Air: ±20 mV.
Range: 0 to 100% LEL methane.
Linearity: 5% non-linear at 5.5% methane.

Environmental Specifications

Sensitivity Change at -20°C: 104.5 to 106.5% referenced to 20°C.
Sensitivity Change at 50°C: 101.5 to 102.5% referenced to 20°C.
Zero Change at -20°C: Less than ±0.5% LEL referenced to 20°C.
Zero Change at 50°C: Less than -0.4% LEL referenced to 20°C.
Temperature Range Certification: T5 -40° to 50°C.

Sensitivity to Other Gases

n-pentane: 0.45% LEL pentane/% LEL methane.
Acetylene: 0.75% LEL acetylene/% LEL methane.
HMDS: 9 hours until 50% activity loss at 10ppm HMDS.

Electrical Specifications

Voltage: 3.0 V (±0.1 V).
Power Consumption: 190 mW.
Voltage Sensitivity: Less than 2% sensitivity change per 0.1V change.

Figures and Diagrams

Figure 1: CH-A3 Schematic Diagram.
Figure 2: Sensitivity Temperature Dependence shows sensitivity variation with temperature changes.
Figure 3: Linearity shows non-linearity from 0 to 5% methane volume, with less than 4% non-linearity at 100% LEL.
Figure 4: Voltage Sensitivity shows sensitivity remains nearly constant over small voltage variations.

Additional Notes

All sensors are tested at ambient environmental conditions with methane unless otherwise stated.
Customers should test under their own conditions to ensure suitability.
Alphasense Ltd reserves the right to change design features and specifications without prior notification.

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