HLS-440P
Automotive Hydrogen Leak Sensor
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.
Type A:
The sensor shall measure the hydrogen concentration in high
humidity conditions, e.g. in the exhaust of a fuel cell system, to
ensure compliance with defined upper thresholds.
Type B:
The sensor shall measure the hydrogen concentration under
ambient humidity conditions, to ensure compliance with
defined upper thresholds.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of HLS-440P, Automotive Hydrogen
Leak Sensor are listed below:
Figure 1:
Added Value of Using HLS-440P
Benefits
• High sensitivity over large
concentration range
Features
• 0 – 10% H
2
in air or nitrogen
• Accuracy ±0.5% vol.
• Resolution 500ppm
• Heated field-effect transistor technology
• No detection towards HC, H
2
S, N
2
, CO, CO
2
, NO
x
• Humidity influence <0.5% typical
• Operating humidity range 5–100% relative humidity
including condensation
•
•
•
•
•
Start-up time <5s
Speed of response (t
90
) < 5s
Speed of recovery < 5s
CAN bus interface 500 kbit/s (ISO11898-2)
PWM output (optional)
• Low cross sensitivity
• Designed for humid environment
• Fast response time
• Low power consumption
• Long-term stability and reliability
• 70 mA (typical)
• ESD and EMC protection
• Operating temperature range –40ºC to 90ºC
• Operating pressure range 0.5 – 1.2 bar (absolute)
ams Datasheet
[v1-00] 2015-Apr-01
Page 1
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HLS-440P −
General Description
Benefits
• Safety integrity level and explosion
proof
• Long lifetime
Features
• Designed for SIL2 (IEC 61508) and ATEX 100a zone 2
• IP6K7 and IP6K9K qualified with expected lifetime of 10
years
Applications
Detection of hydrogen gas leaks in fuel cell systems and other
in-process applications.
Block Diagram
The functional blocks of this device for reference are
shown below:
Figure 2:
HLS-440P Block Diagram
LDO Voltage Regulation
EMC Filter
Protection
Overvoltage, reverse polarity
Timer
μController
Watchdog
Output Switch
Connector
Power Supply
Heater Switch
Resistor
H
2
-Sensor
Page 2
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ams Datasheet
[v1-00] 2015-Apr-01
HLS-440P −
Overview
Installation
The HLS-440P is designed for process connection with metric
straight screw thread with o-ring M14x1.5 in accordance with
ISO 6149-3 (stud end) and to fit into ISO 6149-1 (port).
The HLS-440P can also be mounted on a holder for open-air
application.
Recommended O-ring 11.3±0.2, 2.2±0.08 or 11.3±0.2, 2.4±0.08
EPDM 70 “Peroxide crosslinked” or FPM 75 (Viton)
Recommended torque for fixation: 15 Nm (+10% -0%) acc.
ISO 6149-3
Recommended orientation of the sensor, see below.
Figure 4:
Recommended Mounting Position of the Sensor
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ams Datasheet
[v1-00] 2015-Apr-01
HLS-440P −
Electrical Interface
Electrical Interface
Electrical Connector
The sensor connector is a A2105404381 - Code A with mating
connector MQS 4-pin, TE Connectivity AMP p/n 1-967640-1
Code A.
Figure 5:
Pin Coding AMP 1-967640-1 Code A
1
2
3
4
Figure 6:
Pin Assignment
Pin
1
2
3
Vcc
GND
Function
CAN – High
Type A with termination resistor
Type B no termination resistor
CAN – Low
Type A with termination resistor
Type B no termination resistor
4
ams Datasheet
[v1-00] 2015-Apr-01
Page 5
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