General Description
The HLS-440P automotive hydrogen sensor monitors hydrogen leakage concentrations of 0 - 10% in air. The design fulfills Zone 2 requirements according to ATEX 100a. The predicted concentration is transmitted to the host via the CAN bus interface or with PWM output.

FEATUREs
• 0 – 10% H2 in air or nitrogen
• Accuracy ±0.5% vol.
• Resolution 500ppm
• Heated field-effect transistor technology
• No detection towards HC, H2S, N2, CO, CO2, NOx
• Humidity influence <0.5% typical
• Operating humidity range 5–100% relative humidity
   including condensation
• Start-up time <5s
• Speed of response (t90) < 5s
• Speed of recovery < 5s
• CAN bus interface 500 kbit/s (ISO11898-2)
• PWM output (optional)
• 70 mA (typical)
• ESD and EMC protection
• Operating temperature range –40ºC to 90ºC
• Operating pressure range 0.5 – 1.2 bar (absolute)
• Designed for SIL2 (IEC 61508) and ATEX 100a zone 2
• IP6K7 and IP6K9K qualified with expected lifetime of 10
   years

Benefits
• High sensitivity over large
   concentration range
• Low cross sensitivity
• Designed for humid environment
• Fast response time
• Low power consumption
• Long-term stability and reliability
• Safety integrity level and explosion
   proof
• Long lifetime

APPLICATIONs
   Detection of hydrogen gas leaks in fuel cell systems and other
   in-process applications.