+41 43 268-43-35
info@pergam-suisse.ch
info@pergam-suisse.ch
+1 425 251-1483
info@pergamusa.com
info@pergamusa.com
+39 030 3531423
info@pergamitaly.eu
info@pergamitaly.eu
SELMA Smart Plus
Portable Natural Gas Identifier
Compact laser methane and ethane detector with pump-driven sampling and ppm-level sensitivity
Portable Methane and Ethane Detector for Reliable Natural Gas Identification
SELMA Smart Plus is a portable methane and ethane detector designed for professional gas leak inspections. Using TDLAS technology and active pump-driven air sampling, it measures methane (CH₄) and ethane (C₂H₆) simultaneously and helps distinguish natural gas from other methane sources directly in the field. The instrument combines selective gas detection with integrated positioning and automatic data recording, giving inspection teams reliable information for leak verification during routine surveys and emergency response work.
Explosion-proof rating II 2G Ex ib IIB T4 Gb
Explosion-proof rating II 2G Ex ib IIB T4 Gb
Why Measure Methane and Ethane
Many portable gas detectors measure methane alone. Detecting methane, however, does not always reveal where the gas comes from. Methane can be released by natural gas systems as well as biological processes, making it difficult to determine whether a detected leak originates from pipeline infrastructure. Natural gas typically contains both methane and ethane, while biogas generally contains lower levels of ethane. By comparing the measured concentrations of both gases, SELMA Smart Plus helps distinguish natural gas from other methane sources. This additional information gives inspectors greater confidence when verifying leaks in the field.
SELMA Smart Plus Key Features
-
Simultaneous methane and ethane measurement
for reliable natural gas identification. -
Selective TDLAS detection
minimizes interference from background gases. -
PPM-level sensitivity
for detecting trace gas concentrations. -
Factory-calibrated operation
with no routine calibration required. -
Built-in pump-driven sampling
provides consistent gas delivery to the optical measurement chamber. -
Integrated GNSS positioning and automatic data logging
for complete inspection records. -
ATEX and IECEx certified
for use in hazardous locations. -
IP65-rated enclosure
for dependable operation in demanding outdoor environments.
SELMA Smart Plus Main Specifications
-
TDLAS
Detection technology -
CH₄, C₂H₆
Target gases -
10 ppm
Methane detection limit -
1 ppm
Ethane detection limit -
0–100% VOL, LEL
Methane measurement range -
0–10,000 ppm
Ethane measurement range -
-20 to +50 °C
Operating temperature -
IP65
Protection rating
Efficient Data Management
With automatic data recording, GNSS positioning, and flexible data transfer options, SELMA Smart Plus helps maintain consistent inspection records during routine surveys and emergency investigations.
-
SD card
SELMA Smart Plus simplifies documentation by automatically recording original detection data and storing inspection results locally on a 64 GB SD card. -
USB-C
Data can be transferred to a PC through the USB Type-C interface or accessed directly from the SD card for further analysis and archiving. -
GNSS
Integrated GNSS positioning allows measurement data to be linked with inspection locations, helping teams create traceable field records. -
App
A dedicated mobile application supports on-site data viewing and device configuration, providing flexible data management on both mobile and PC platforms.
Why Choose SELMA Smart Plus
-
Reliable gas source identification
Simultaneous methane and ethane measurement helps inspectors distinguish natural gas from other methane sources with greater confidence. -
Selective TDLAS measurement
Laser-based detection technology provides high selectivity for methane and ethane while minimizing interference from background gases. -
Consistent field sampling
A built-in pump-driven sampling system maintains stable air intake, while interchangeable probes support different inspection conditions. -
Ready for demanding environments
IP65 protection, ATEX/IECEx certification, and operation from -20 to +50 °C support reliable use in industrial and outdoor applications. -
Efficient inspection workflow
GNSS positioning, automatic data logging, and convenient data export simplify documentation and help maintain traceable inspection records. -
Low maintenance operation
Factory calibration with no routine calibration required minimizes the need for regular servicing.
How SELMA Smart Plus Works
As the beam passes through the gas, some of the light is absorbed by its molecules. A sensor then captures the reflected light, and by analyzing how much was absorbed, the system determines the gas concentration.
SELMA Smart Plus combines TDLAS technology with an active pump-driven sampling system to measure methane and ethane in ambient air. It continuously draws in air samples and passes laser light through them. By analyzing the absorption at wavelengths specific to methane and ethane, the instrument determines the concentration of each gas.
SELMA Smart Plus combines TDLAS technology with an active pump-driven sampling system to measure methane and ethane in ambient air. It continuously draws in air samples and passes laser light through them. By analyzing the absorption at wavelengths specific to methane and ethane, the instrument determines the concentration of each gas.
SELMA Dome G5 utilizes TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology that enables precise gas detection using a tunable diode laser. The laser emits a narrow beam of light at a wavelength that matches the absorption profile of the target gas.
Laser
Mirror
Air sample intake
Air sample exhaust
Built-in TDLAS module
Advanced sampling system
Built-in TDLAS module
Unlike conventional pump-assisted methane detectors that measure methane alone, SELMA Smart Plus evaluates both methane and ethane simultaneously. By comparing the concentrations of these gases, it helps determine whether the detected gas originates from a natural gas leak or another methane source.
To support stable measurements in the field, SELMA Smart Plus combines active pump-driven sampling with interchangeable probes and a multi-stage filtration system. Fine, hydrophobic, and powder filters help remove moisture and airborne contaminants before the gas reaches the optical chamber, protecting internal components and maintaining consistent sampling performance during extended inspections.
SELMA Smart Plus Applications
SELMA Smart Plus is designed for natural gas leak monitoring in urban environments and for long-distance pipeline surveys. The instrument is also suitable for emergency leak response, industrial gas safety inspections, and environmental gas source tracing.
Gas Distribution
System
System
Gas Distribution
Station
Station
Gas Processing
Plant
Plant
Gas Compression
Station
Station
Gas
Storage
Storage
Transportation Gas Pipeline
SELMA Smart Plus Applications
SELMA Smart Plus is designed for natural gas leak monitoring in urban environments and for long-distance pipeline surveys. The instrument is also suitable for emergency leak response, industrial gas safety inspections, and environmental gas source tracing.
-
Gas Distribution System
-
Transportation Gas Pipeline
-
Gas Distribution Station
-
Gas Processing Plant
-
Gas Compression Station
-
Gas Storage
Why leak detection matters
Natural gas monitoring, especially in urban areas, is essential not just for safety, but also for protecting the environment. Methane is a potent greenhouse gas, trapping heat much more effectively than carbon dioxide. Even small leaks, if left undetected, can grow and seriously impact the climate. Regular monitoring helps detect leaks early, prevent dangerous situations, and control emissions in accordance with environmental regulations including the EU Methane Regulation.
FAQ
Honest answers to important questions
A methane detector confirms the presence of methane, but methane alone does not always indicate the source of a leak. SELMA Smart Plus measures both methane and ethane simultaneously. By analyzing the relationship between these gases, it helps distinguish natural gas from biogas and other methane sources.
Natural gas typically contains both methane and ethane, while biogas generally contains lower levels of ethane. By comparing the measured concentrations of both gases, the SELMA Smart Plus helps identify whether the detected gas is consistent with natural gas.
SELMA Smart Plus uses Tunable Diode Laser Absorption Spectroscopy (TDLAS). The technology analyzes how specific wavelengths of laser light are absorbed by methane and ethane molecules, enabling selective measurement of these gases while minimizing interference from other background gases.
The instrument is factory-calibrated and does not require routine calibration. Optional user recalibration is available.
SELMA Smart Plus detects:
- Methane (CH₄)
- Ethane (C₂H₆)
The instrument is designed for applications such as urban gas pipeline inspection, long-distance pipeline surveys, emergency leak response, industrial gas safety checks, and gas source identification tasks where methane may come from multiple sources.
Yes. The instrument is certified for hazardous locations according to ATEX/IECEx II 2G Ex ib IIB T4 Gb and is designed for use in areas where explosive gas atmospheres may be present.
SELMA Smart Plus automatically records detection data to its internal 64 GB SD card. Inspection records can be exported to a computer through the USB Type-C interface or by reading the SD card with a card reader. A dedicated mobile application also supports on-site data viewing and device configuration.
SELMA Smart Plus uses a built-in pump-driven sampling system for active gas intake. The sampling system supports interchangeable flexible and rigid probes and includes filtration components designed to remove moisture, dust, and airborne contaminants before measurement.
Contact us
You can order the equipment or ask questions here