Evidence & ValidationEvery listing, test result & patent status, checkable at source

Market Validation · Awards · Listings & Certifications · Lab Fire Testing · OEM UL 9540A Testing · Patents & IP · OEM Availability · Documents

Over 40 GWh of BESS being protected · specified by 15+ BESS manufacturers

ETL Listed (Intertek) to UL 2075:2013 Ed.2 · CSFM Listed No. 5275-2414:0001

Independently fire tested by Fire & Risk Alliance · validated in UL 9540 & UL 9540A testing by multiple BESS OEMs

Patents Pending on combined off-gas & hydrogen detection

Market Validation

Over 40 GWh of BESS capacity being protected
Specified by 15+ BESS manufacturers

Over 40 GWh of BESS being protected. R-GAS-FLAMMABLE detectors built on Prevent-iON^® detection technology protect battery energy storage across utility, C&I and data center sites worldwide, engineered into the listed fire safety systems of the OEM partners below.

For scale: that is more than the total battery storage capacity installed across all of Europe in 2025 (25.3 GWh).

Specified by 15+ BESS manufacturers. More than 15 BESS manufacturers specify the detection technology in their systems, several validating it inside their own UL 9540 and UL 9540A certification programs.

R-GAS-FLAMMABLE flammable gas detectors protecting battery energy storage containers

Award-Winning Technology

Recognized by the fire safety industry

Intersec Global Best Active Fire Safety Product Winner 2026 award

Intersec Global: Best Active Fire Safety Product Winner. OEM partner Kentec Electronics received the award for its system built on the patent-pending, calibration-free Prevent-iON^® detection technology.

Fire Buyer International Readers' Award: Detection Solution of the Year. Awarded to UltraSense Sensors by Fireaway, built on the same technology.

InfraSensing is a proud member of the FSSA and the NFPA.

Safety Listings & Certifications

ETL Listed to UL 2075 · CSFM Listed · CE · FM 6320 in progress

NFPA 855 and NFPA 1 call for listed or approved devices, and Listed and Recognized are not interchangeable terms. A listing to a product standard verifies the complete device against calibrated concentrations, with ongoing factory surveillance.

The R-GAS-FLAMMABLE is a gas detector listed to UL 2075 for BESS systems with integration into ventilation systems per applicable NFPA codes. It is not a fire detection, life safety, or suppression initiating system.

North American safety listing	ETL Listed (Intertek) to UL 2075:2013 Ed.2, Standard for Gas and Vapor Detectors and Sensors. Listed on methane, with UL 2075 hydrogen sensitivity testing completed: a dual-gas scope.
California State Fire Marshal	CSFM Listed, Listing No. 5275-2414:0001 for stationary systems.
FM Approvals	FM 6320 certification in progress, scoped to hydrogen. This page will be updated when the approval is granted.
EU electrical safety	Certified to EN 61010-1:2010+A1:2019 (Low Voltage Directive) for measurement and control equipment.
EU gas detector EMC	Certified to EN 50270:2015, the EMC standard specifically for combustible and toxic gas detectors, alongside EN 55032:2015 (emissions) and EN 55035:2017 (immunity).
Environmental & mechanical (IEC)	IEC 60068-2-30:2005 temperature & humidity cycling; IEC 60068-2-6:2007 three-axis vibration.
Immunity & interference (IEC)	IEC 61000-4-2, -4-3, -4-4:2012, -4-5:2014+AMD1:2017, -4-6:2023 and -4-29: ESD, radiated RF, fast transient, surge, conducted RF and voltage-dip immunity.
Substances	RoHS 3 (EU 2015/863) and REACH (EC No 1907/2006, current ECHA Candidate List).
Platform off-gas sensor	The GAS-VOC off-gas sensor is separately UL Recognized to UL 61010.
Listed firmware	The ETL listing to UL 2075 covers a defined firmware version. The current listed release is published on the R-GAS-FLAMMABLE product page.

A listing on one gas does not extend to another without test evidence. Ask which standard, which body, which gases, and whether the device is Listed or Recognized. All records can be verified at source in the certification bodies' public listing directories.

Independent Lab Fire Testing

Live-fire thermal runaway testing by Fire & Risk Alliance, an independent fire protection engineering and testing laboratory · Report 1184-001

43 s

R-GAS-FLAMMABLE Any Flammable Gas Mixture reading: average time to alarm (CH₄-equivalent %LEL)

101 s

Legacy flammable gas detector: same test series, same conditions

90 s

Mitigation window enabled by earlier off-gas & hydrogen alarms

Fire & Risk Alliance Gas Sensor Evaluation, Summary Report 1184-001, July 2026

Live-fire thermal runaway. Initial off-gas signal at 0:00, venting confirmed at +0:07 while legacy detectors remained silent; hydrogen alarm at 10% LEL at +2:20 versus +3:50 for the legacy detectors. The comparator is not identified; figures are the reported averages, stated without adjustment.

Siloxane immunity. Across 60 hours of continuous D4/D5 siloxane exposure the sensor held zero drift, while the legacy catalytic comparator lost 20% of its sensitivity.

Report 1184-001 available on request. The full Fire & Risk Alliance evaluation can be shared with specifiers and AHJs, and the same test series measured the mixture criterion end to end: see The mixture criterion & the data. Request the report.

BESS OEM UL 9540A Testing

Unit-level validation inside the OEMs' own certification programs

42 s

hydrogen reported ahead of the legacy H₂ detector that triggered the purge system

55 s

ahead of the fire alarm activation in the same thermal runaway event

different flammable gases detected, twice, in the same unit-level test

Validated by multiple BESS OEMs. The detection technology has been validated in the UL 9540 and UL 9540A test programs of multiple BESS OEMs, as part of their own system certifications. UL 9540A is the fire-test method a product can be validated in; it is not a product listing.

Inside one UL 9540A unit-level test. The R-GAS-FLAMMABLE was mounted inside the battery unit, powered from the fire alarm control panel and logged over Modbus RTU, through both a cell venting test and a full thermal runaway test with two runaway events. The hydrogen, methane and Any Flammable Gas Mixture channels were recorded side by side. In the thermal runaway stage it reported hydrogen 42 seconds before the legacy H₂ detector that triggered the purge system and 55 seconds before the fire alarm, and detected six different flammable gases, twice: a window in which purge fans and vents can already be running before an explosive gas mixture accumulates.

Report available on request. The UL 9540A unit-level test report from one of the BESS OEM programs can be shared with specifiers and AHJs. Request the report.

AI rendering of a BESS fire as an illustration

Patents & IP

Patents pending, stated exactly

Patent applications are pending on the combined off-gas and hydrogen detection architecture: one standalone detector covering both the early-warning off-gas layer and the flammable gas layer. Further applications are pending on cross-zoning and other technologies we introduced. Pending means pending: the wording on this page is updated when grants issue.