Prevent-iON^® validation

Proven in the field.
Proven in large scale fire tests.
Listed by UL, Intertek & CSFM.Over 40 GWh of BESS being protected
global availability through 8 fire safety OEMs

Witnessed live

Fire & Risk Alliance symposium attendees at the Fluence Smartstack test units before the public live fire test

Fire & Risk Alliance symposium, Cambridge, Maryland
September 2026, just before the live fire test

Public UL 9540A fire test by Fire & Risk Alliance for Fluence

0 sR-GAS-FLAMMABLE into alarm

+1 sNFPA 69 ventilation activated

+3 min 31 sSmoke detector fire alarm

+14 min 4 sAnother competing gas detector

Times from the event log of the Siemens fire alarm control panel, installed and configured by ORR Protection and time synchronized before the test. Louver actuation was observed on site. Technology Validation Dossier

A real battery system. A real fire. Hundreds of witnesses. In a public UL 9540A fire test on a Fluence Smartstack, run by Fire & Risk Alliance, the R-GAS-FLAMMABLE was the first detector into alarm.

One dossier. Every result traced.

Large scale fire tests, lab fire tests and stress tests.

Large scale fire tests

Four UL 9540A tests, one of them public, and three container fires

Lab fire tests

21 gas exposures against nine other detectors and three releases of real runaway gas

Stress tests

Damp heat, siloxane, cold and hot storage, and EN 50270 EMC

Every figure traces to a laboratory report, a test log or a fire alarm control panel event log. Available to specifiers and AHJs on request.

Request the dossier

Three listings. Verifiable at source.

UL, Intertek and the California State Fire Marshal,
plus EN 50270 witnessed by FM Approvals

cULus Listed

Electrical safety, US and Canada
UL file E535565

ETL Listed

UL 2075 gas detection
Control No. 5032141

CSFM

CSFM Listed

California State Fire Marshal
Listing No. 5275-2414:0001

EN 50270

FM witnessed

EMC for gas detectors, tested with an FM Approvals engineer witnessing
FM 6320 in progress

All listings & certifications

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.

Outperformed every other detector tested.

In independent lab tests and in large scale fire tests

Independent lab · ten detectors

1st of 10

First of ten commercially available detectors to reach 10 %LEL on real cell vent gas, about 30 s ahead of the next. Run by Fire & Risk Alliance.

Independent lab · Report 1184-001

58 s earlier

First response to released LFP runaway gas in 43 s on average, against 101 s for a legacy detector in the same box.

BESS OEM · UL 9540A unit level

41 s earlier

25 %LEL hydrogen 41 s before the legacy H₂ detector that triggered the purge, and 54 s before the smoke alarm.

BESS OEM · container fire tests

3 of 3

Hydrogen alarm in all three container fires, up to 301 s before the logged runaway. The legacy detectors in the same container never went into alarm.

UL 9540A is a test method a product is validated in, not a listing. Comparators and battery makers are not identified; figures are as reported, stated without adjustment. See also The mixture criterion & the data.

Stress testing.

To the requirements of global BESS and battery manufacturers

Battery manufacturer requirement · siloxane

0% loss

Three 24 h exposures to D4 and D5 siloxane vapor at 50 °C. Hydrogen response unchanged and zero held at zero. The legacy detector beside it lost 36%.

BESS manufacturer requirement · damp heat

1,000 h

Powered at 60 °C and 95 %RH. Four of four units passed: zero drift within 3% of full scale and alarm within tolerance on 25 %LEL hydrogen.

BESS manufacturer requirement · temperature

−40 to 75 °C

48 h powered at −40 °C, 48 h stored at −40 °C and at 70 °C before switch on, and 52 cycles between −40 °C and 75 °C. All passed.

EN 50270 EMC, witnessed by FM Approvals, completes the BESS manufacturer's requirement set. All stress tests were run by independent laboratories; customers are not named.

Gen 4 in rack detection.

Off-gas + thermal runaway sensing technology
validated by Fire & Risk Alliance

Gen 4 in rack off-gas and thermal runaway sensor

3 of 3 real runaway gas releases detected

Gas collected from an LFP cell driven into thermal runaway, released three times. Both the off-gas and the thermal runaway sensing detected it every time. Certification to UL standard pending.

Gen 4 Sensor

Proven in the field.

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

Prevent-iON^® detection technology is sold exclusively through 8 fire safety OEMs, who engineered, tested and certified it inside their own listed fire safety systems. They handle sales, technical support, training, repairs and warranty service.

For scale: over 40 GWh is more than the total battery storage capacity installed across all of Europe in 2025 (25.3 GWh).

Find Our Partners

Award winning. Patents pending.

Recognized by the fire safety industry

Best Active Fire Safety Product

Intersec Global winner, awarded to OEM partner Kentec Electronics for its system built on Prevent-iON^® detection technology. Same technology: Fire Buyer International Readers' Award, Detection Solution of the Year.

Patents Pending

On the combined off-gas and hydrogen detection architecture, cross zoning and other technologies we introduced. Pending means pending: this page is updated when grants issue.

Documents & downloads

All available without registration

Data Sheet User Manual Product Catalogue App Data Sheet 2026 Quick Guide & Checklist Knowledge Articles

Questions on any listing or test result? Ask your question.

North American electrical safety listing	cULus Listed (UL) to UL 61010-1, 3rd Ed., and CSA C22.2 No. 61010-1:12, file E535565, Measuring, Testing and Signal Generation Equipment (PICQ, PICQ7). Verifiable at source in the UL Product iQ directory under E535565.
North American gas detector listing	ETL Listed (Intertek) to UL 2075:2013 Ed.2, Standard for Gas and Vapor Detectors and Sensors.
California State Fire Marshal	CSFM Listed, Listing No. 5275-2414:0001 for stationary systems.
FM Approvals	FM 6320 certification in progress, scoped to hydrogen. The EN 50270 EMC testing for the program is completed and passed, witnessed by an FM Approvals engineer. 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, tested with an FM Approvals engineer witnessing, 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.

Proven in the field.Proven in large scale fire tests.Listed by UL, Intertek & CSFM.Over 40 GWh of BESS being protectedglobal availability through 8 fire safety OEMs