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Brand: Crowcon
Crowcon Fgard H2 Hydrogen Flame Detector
Description
A flame detector made for hydrogen
Hydrogen burns with an almost invisible flame, and conventional multi-spectrum detectors may not discern it. The Crowcon Fgard H2 is optimised only for hydrogen flame detection. Crowcon quotes a response time of about 4 seconds and detection of a 36 inch hydrogen plume at 40 metres. Heated optics prevent condensation and ice, automatic optical verification checks the lens and electronics, and Crowcon states a 5 year warranty period in its datasheet, and the unit carries Factory Mutual endorsement.
Technical specifications
| Parameter | Specification |
|---|---|
| Detection focus | Hydrogen flames (optimised only for hydrogen) |
| Enclosure | Copper-free aluminium or 316 stainless steel |
| Dimensions | 100 mm dia x 200 mm (4 in x 8 in) |
| Weight | Aluminium 2.5 kg (5.5 lb); stainless steel 6.0 kg (13.2 lb) |
| Cable entry | 3/4 inch NPT or M25 |
| Operating voltage | 24 Vdc nominal (18 to 32 Vdc) |
| Power consumption | 3 W minimum without heater; 12 W maximum with heater |
| Response time | 2 to 5 seconds (typical) at 40 m (131 ft) |
| Outputs | Relay contacts (DPDT 2 A at 30 Vdc) for alarm and fault; 0-20 mA; HART |
| Operating / storage temperature | -60 to +85 degC for both |
| Humidity | 0 to 93 percent RH, non-condensing |
| Performance approvals | FM 3260; EN 54-10; IP66 / NEMA 4X; SIL 2 capable to IEC 61508 |
| Hazardous area certification | Class 1 Div 1 Groups B, C, D T4 (ambient -50 to +85 degC); Class 1 Zone 1 AEx/Ex db IIC T4; ATEX II 2 G Ex db IIC T4; IECEx Ex db IIC T4 (-60 to +85 degC); INMETRO Ex db IIC T4; PESO Ex db IIC T4 |
| Warranty | Manufacturer states 5 years in the datasheet; terms for an order are confirmed in the quotation |
Flame sensitivity
| Fuel | Fire size | Distance |
|---|---|---|
| Hydrogen | 36 in / 90 cm plume | 40 m (131 ft) |
| Methane | 36 in / 90 cm plume | 30 m (100 ft) |
| Methanol | 30 x 30 cm | 20 m (65 ft) |
| Methylated spirits | 30 x 30 cm | 20 m (65 ft) |
| n-Heptane | 30 x 30 cm | 12 m (40 ft) |
Applications and selection
Listed applications include hydrogen generators and fuelling stations, hydrogen-to-methane production, compressors, refining, gas plants, fertiliser production, semiconductor manufacturing, refrigeration and hydrogen transport. Because the H2 is tuned for hydrogen, its hydrocarbon ranges are shorter than a general hydrocarbon detector: n-heptane is rated at 12 m. For hydrocarbon hazards use the Fgard IR3 or UVIR; for mixed hazards agree the detector mix with your fire and gas designer. More units are listed under flame detectors.
Documents and quotation
The attached Crowcon datasheet (UK edition, September 2026) holds the specification and sensitivity table. Send the housing material, cable entry and certification needed with the quantity for a quotation.
Datasheets & Documents
- Datasheet Crowcon Fgard H2 datasheet (UK EN, 09/2026) Download
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About brand
Crowcon has made gas detection instruments since 1970 and is based in Abingdon, United Kingdom. The company builds portable detectors worn or carried by workers and fixed detectors and control panels for plant areas, covering flammable gases, toxic gases and oxygen. Seven Star LLC sources and supplies Crowcon portable gas detectors, sensors and accessories for sites in Oman, including the Gas-Pro and Gasman listed on this page.
Crowcon portable detectors listed here
The Gasman is a single-gas personal detector, worn by one person to warn of one hazard such as hydrogen sulfide, carbon monoxide, flammable gas or low oxygen. The Gas-Pro is a multi-gas detector for confined space entry that monitors up to five gases and can be ordered with an internal pump for pre-entry sampling. In both cases the sensor fit is chosen at the time of order.
Ordering Crowcon detectors: what we need
Send the gases and ranges you need, the alarm levels if they differ from the manufacturer's defaults, and for a Gas-Pro if the pumped version is wanted. For spare sensors, send the detector model, serial number and the gas. Add chargers, sampling kits or test accessories to the same inquiry. Contractors in the GCC should state the approval marking their site permit system asks for.
Browse Crowcon products by category: Fire & Gas Detector.
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Frequently Asked Questions
What does the Fgard H2 detect?
Hydrogen flames, with some response to methane, methanol and other fuels at shorter range.
What is the hydrogen detection range?
A 36 inch (90 cm) hydrogen plume at 40 m (131 ft).
How fast does it respond?
Typically 2 to 5 seconds at 40 m per the specification table.
What warranty period does the manufacturer state?
The Crowcon datasheet states a 5 year warranty period. Warranty terms for an order are confirmed in the quotation.
What outputs does it provide?
DPDT alarm and fault relays, 0-20 mA and HART.
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