HLS-442 www.ams.com/Hydrogen-Sensors HLS-442 – Hydrogen Leak Sensor -Fast and highly selective -Low power and flexible packaging -Uniquely designed for superior sensing over wide detection range We provide innovative analog solutions to the most challenging applications in sensor and sensor interfaces, power management, and wireless. General Description The ams HLS-442 Hydrogen Leak Sensor is an accurate, fast responding sensor designed for installation in vehicles and hydrogen fueling stations. Unlike sensors that can be extremely cross sensitive to a variety of combustible gases, ams’ HLS-442 sensor was developed using advancements in Field Effect (FE) technology. This enables it to be highly selective to hydrogen gas without interference from background gases or water vapor. The HLS-442 incorporates a heated field-effect transistor with a catalytic metal gate stack as the gas-sensing layer. Hydrogen molecules interact with the gate, thereby changing characteristics of the transistor. The heated transistor also measures the thermal conducting properties of the gas complementing the field effect signal. Sensor signals are processed in a microprocessor to provide hydrogen concentration output. The HLS-442 Hydrogen Leak Sensor features reduced power consumption, provides increased packaging flexibility, and includes a CAN bus electrical interface with standard MQS six-pin connector. Self testing at start up and advanced error handling ensure reliable operation. In addition, a short start up time enables an intermitted mode of operation that minimizes current consumption better. ams’ unique design and careful processing of the gate stack result in superior sensor properties, including high-response speed and excellent selectivity, as well as a detection range that covers the lower explosion limit of hydrogen gas. HLS-442 Specifications Target gas Concentration range Accuracy Hydrogen 0–4.4% H 2 in air ±3000 ppm Speed of response (t90) < 2 seconds Speed of recovery < 10 seconds Cross-sensitivity Start-up time Self test/Error handling No detection towards HC, H2S, N2, CO, CO 2, NOx, H2O Humidity influence, not detectable 1 second Benefits -0–4.4% H2 - High sensitivity to hydrogen gas - Low cross sensitivity - Fast response time - Low power consumption - Long-term stability and reliability - Long lifetime Developed in accordance to IEC 61508 (SIL2) Electrical Supply voltage 9V–16V Supply current 75mA typical Can Interface Pin selectable CAN ID Connector Mating Connector ESD/Reverse polarity CAN 2.0 ISO 11898 Yes A2100011199, 6-PIN Code A Applications -Detection of hydrogen gas leaks in the cabin ceiling, under the hood of the engine compartment, or beneath the trunk lid of hydrogen powered vehicles - Detection of hydrogen gas in and around hydrogen fueling stations MQS 6-pin, AMP p/n 1-967616-1 type A Yes Environmental Operation temperature range Storage temperature range Humidity -40°C to +85°C -50°C to +85°C 0–5% absolute humidity Pressure 70–130 kPa EMC Automotive ATEX 100a zone 2 Shock Automotive Vibration Automotive Mechanical Dimensions (LxWxH) Weight Material Gas filter membrane IP code 82.2 mm x 42 mm x 17.3 m 50g PBT GF30 Pall SUPOR 450R, 0.45 μm IP6K7 www.ams.com [email protected] © 03/2015 by ams Subject to change without notice Headquarters ams AG Tobelbader Strasse 30, 8141 Unterpremstaetten, Austria Phone +43 3136 500-0 · Fax +43 3136 525-01 Sales Offices Worldwide [email protected] [email protected] [email protected]