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Alphasense
CH-D3 Flammable Gas Sensors

CH-D3 Flammable Gas Sensors

Product catalog summary

Performance Specifications:
- Sensitivity to methane ranges from 11 to 17 mV per % methane.
- Response time (t90) from air to 50% LEL methane is less than 12 seconds, typically 7 seconds.
- Zero mV in zero air is ±20.
- Methane detection range is 0 to 100% LEL.
- Linearity deviation is 6% methane when 5% non-linear.

Environmental Specifications:
- Sensitivity change at -20°C is 103 to 105% compared to 20°C.
- Sensitivity change at 50°C is 101 to 102% compared to 20°C.
- Zero shift at -20°C is less than +0.5% LEL compared to 20°C.
- Zero shift at 50°C is less than -0.5% LEL compared to 20°C.
- Temperature range for certification to T6 is -40° to 45°C.

Sensitivity to Other Gases:
- n-pentane sensitivity is 0.50% LEL pentane per % LEL methane.
- Acetylene sensitivity is 0.70% LEL acetylene per % LEL methane.
- HMDS poisoning results in 50% activity loss after 10 hours at 10ppm HMDS.

Electrical Specifications:
- Operating voltage is 3.0 V (±0.2 V).
- Power consumption is 190 mW.
- Voltage sensitivity change is less than 3% per 0.1V change.

Certifications:
- Sira 07ATEX 1088X, IECEx SIR07.0031X, UL913 091007-E253708, CSA 22.2 1906313.
- Certified for Class I, II, and III, Division 1 environments.

Figures and Diagrams:
- Figure 1: CH-D3 Schematic Diagram.
- Figure 2: Voltage Sensitivity shows the variation in sensitivity due to changes in pellistor voltage.
- Figure 3: Zero Temperature Dependence shows output variation due to temperature changes.
- Figure 4: HMDS Poisoning illustrates sensitivity loss over time when exposed to HMDS.

Additional Notes:
- All sensors are tested under ambient conditions with methane unless otherwise stated.
- Customers are advised to test sensors 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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