We Invent to Prevent.
We Invent to Prevent.
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SELMA MPB2
High-sensitivity vehicle-mounted laser methane detector for bumper installation with 0.03 ppm sensitivity and 0.04 s measurement time.
SELMA MPB2 In Brief
The SELMA MPB2 (Multi Pass Bumper) is a front-mounted vehicle-based laser methane detector designed for periodic inspection of underground gas pipelines. It continuously draws ambient air into the measurement cell and performs rapid methane analysis while the vehicle is in motion. With a sensitivity of 0.03 ppm and a measurement time of 0.04 s, the MPB2 can reliably detect trace methane concentrations at survey speeds of up to 50 km/h.
Developed in close cooperation with gas distribution companies, the detector is tailored to the practical demands of daily pipeline inspections. It has been validated in real-world conditions to ensure stable operation in dense urban environments, including areas with elevated hydrocarbon background levels. Its user-friendly design simplifies maintenance and routine operation, while enabling cost-effective, large-area inspections without disrupting traffic flow.
SELMA MPB2 can be installed on a vehicle without any special preparation.
Developed in close cooperation with gas distribution companies, the detector is tailored to the practical demands of daily pipeline inspections. It has been validated in real-world conditions to ensure stable operation in dense urban environments, including areas with elevated hydrocarbon background levels. Its user-friendly design simplifies maintenance and routine operation, while enabling cost-effective, large-area inspections without disrupting traffic flow.
SELMA MPB2 can be installed on a vehicle without any special preparation.
For greater inspection flexibility, the MPB2 can be used together with the SELMA Dome, SELMA Dome G5, or SELMA Mini remote laser methane detectors.
SELMA MPB2 Key Features
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Fully automated inspection process
Drive the route. The system handles the rest. -
Built-in reference cell
No calibration required. -
Internal memory
For saving inspection data -
Built-in GPS receiver
For accurate leak location. -
Integrated software
For leak monitoring, route mapping, and easy data reporting. -
Leak alarms
Provides visual and audible alarms when methane is detected.
SELMA MPB2 Main Specifications
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0.03 ppm
Methane detection sensitivity -
50 km/h
Max survey speed -
0.04 s
Measurement time -
12V DC
Power supply -
560 × 190 × 190 mm
Size -
25 kg
Weight
How SELMA MPB2 works
SELMA MPB2 utilizes TDLAS technology
The ambient air sample enters a multi-pass optical cell, where laser radiation tuned to the specific methane absorption line passes repeatedly between two opposing mirrors. As the laser beam travels through the sampled air, its intensity decreases proportionally to the methane concentration along the optical path, allowing the system to determine methane concentration in the sample in real time.
Good to Know Before a Survey
Please note a few limitations and key considerations.
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No source differentiation
The system measures CH₄ levels and cannot distinguish between natural gas and methane produced in sewer systems or landfills. -
Wind matters
Strong wind disperses the plume quickly and makes small leaks harder to detect. -
1–2 person crew
The system can be operated by one person, but a driver and a separate operator are recommended.
SELMA MPB2 Software
The software generates detailed inspection reports for full traceability and displays the inspector’s real-time position along the pipeline route. Precise laser-based detection helps distinguish methane from other urban emissions, including vehicle exhaust. During analysis, the software compensates for vehicle speed and accounts for wind speed and direction. To pinpoint the exact leak location, the operator can then verify it on site using a handheld device such as the LM Smart.
SELMA MPB2 applications
SELMA MPB2 is designed for monitoring of natural gas leaks in urban environments as well as at gas storage facilities and along pipelines
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City inspections
-
Countryside inspections
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Underground gas storages
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Transportation gas pipelines
SELMA MPB2 applications
SELMA MPB2 is designed for monitoring of natural gas leaks in urban environments as well as at gas storage facilities and along pipelines
Underground
gas storages
gas storages
Countryside inspections
Transportation gas pipelines
City
inspections
inspections
Proven Performance Worldwide
Our systems are deployed around the world, operating across diverse regions, climates, and environmental conditions. From urban areas to remote locations, they support reliable field operations in a wide range of environments.
Upgrade Your Methane Detection System
For comprehensive methane leak detection, combine the SELMA MPB2 with the SELMA Dome G5 or SELMA Mini systems.
Recommended configuration
For comprehensive street-level inspections.
- Bumper-mounted laser methane detectorSELMA MPB2For mains and service lines beneath the roadway.
- Handheld laser methane detectorFor pinpointing the leak source on foot after detection by the vehicle-mounted system.
Why leak detection matters
Continuous methane monitoring, especially in urban areas, is essential not only for safety but also for environmental protection. Methane is one of the most potent greenhouse gases, trapping heat much more efficiently than carbon dioxide. Even small leaks, if undetected, can increase and have a serious impact on the climate. This is why regular monitoring is important: it helps to detect leaks as soon as they occur, prevent dangerous situations and control emissions in accordance with environmental regulations.
FAQ
Honest answers to important questions
No. SELMA MPB2 is designed specifically to detect methane. Its laser-based technology distinguishes methane from other gases, preventing false alarms caused by gases other than methane.
Yes, SELMA MPB2 can operate in all weather conditions.
No. Water vapor does not affect SELMA MPB2’s measurement accuracy.
No. SELMA MPB2 performs an automatic calibration sequence at startup. The system will not complete the sequence unless it detects methane. When the detector indicates that it is ready for operation, this confirms that the methane detection check has been completed, so no routine calibration check is required before use.
No. SELMA MPB2 detects methane but does not measure ethane, which is used to help distinguish natural gas leaks from other methane sources, such as landfills, drains, and biogas emissions. Therefore, methane detection alone cannot reliably identify whether the source is a natural gas leak.
Yes, if the escaping gas can reach the laser path. Paved surfaces and deep-buried pipelines can limit gas migration to the surface, making leaks more difficult to detect.
Strong winds can disperse escaping gas and mix it with ambient air, making leaks more difficult to detect.
SELMA MPB2 stores data in a format that can be readily opened in GIS software. Integration with GIS, CMMS, or SCADA systems can be tailored to your specific requirements. The scope, compatibility, and cost of integration depend on your technical requirements, which need to be reviewed before a cost estimate can be provided.
All data is stored locally on the operator’s laptop and remains under the operator’s control. SELMA MPB2 does not require an internet connection to operate, allowing fieldwork to continue without internet access.
SELMA MPB2 is not designed for use in explosive atmospheres or hazardous areas requiring explosion-protected equipment.
A one-year warranty is provided as standard.
Detection depends on methane reaching the air intake, with wind conditions and vehicle position affecting the results.
Contact us
You can order the equipment or ask questions here