ams Datasheet Page 1
[v1-00] 2015-Mar-30 Document Feedback
HLS-442
Automotive Hydrogen Leak Sensor
The HLS-442 automotive hydrogen leak sensor monitors
hydrogen concentrations of 0 – 4.4% in air. The sensor is a leak
sensor developed in accordance to IEC 61508 (SIL2) and
explosion protected according to ATEX 100a. The predicted
concentration is transmitted to the host via the CAN bus
interface. HLS-442 utilizes self-calibration that is performed
automatically when operated in air with normal hydrogen
concentration. Therefore, the HLS-442 should not continuously
be operated in elevated background levels of
hydrogen.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of HLS-442, Automotive Hydrogen
Leak Sensor are listed below:
Figure 1:
Added Value of Using HLS-442
Benefits Features
• High sensitivity and excellent
selectivity to hydrogen gas
•0–4.4% H
2
in air
• Accuracy ±3000 ppm at normal operation
• Low cross sensitivity
• Heated field-effect transistor technology
•No detection towards HC, H
2
S, N
2
, CO, CO
2
, NO
x
, H
2
O
• Humidity influence not detectable
• Fast response time
•Start-up time <5s
• Speed of response (t
90
) < 2s
• Speed of recovery < 10s
• CAN bus interface 500 kbit/s (ISO11898-2)
• PWM output (on request)
• Low power consumption • 75 mA (typical)
• Long-term stability and reliability
• ESD and EMC protection
• Operating temperature range –40ºC to 85ºC
• Safety integrity level and explosion
proof
• Designed for SIL2 (IEC 61508) and ATEX 100a zone 2
• Long lifetime • IP67 qualified with expected lifetime of 10 years
