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Brand: Honeywell
Honeywell FS20X Plus UV/3IR Flame Detector
Description
FS20X Plus UV/3IR flame detector for mixed-fuel hazards
The Honeywell FS20X Plus is a flame detector that pairs an ultraviolet sensor with three infrared bands to cover hydrocarbon, non-hydrocarbon and hydrogen fires in a single housing. It is the newer, simplified member of the FS20X family: the standard FS20X is built around UV/dual IR/visible sensing, while the FS20X Plus reduces the ordering matrix and bundles communications, mounting and a sunshade. Seven Star LLC supplies the FS20X Plus in Oman and the GCC as an independent supplier in Muscat.
Honeywell positions it for sites where rain, fog and smoke make long-range optical detection difficult, and where specifying a different detector for each fuel adds cost and spares. A high-visibility LED halo ring around the lens shows status from a distance, which helps operators and maintenance teams check a detector from the walkway.
Decoding the FS20XP part number
The datasheet gives a short ordering string, so there is little room for error. The part number begins FS20XP- and then adds one letter per option.
| Position | Meaning | Options |
|---|---|---|
| Material | Enclosure material | S = stainless steel, A = aluminium |
| Entries | Cable or conduit entries | M = M25, N = 3/4 in NPT |
| Approvals | Approval set | G = global |
| Reserved | Not used | X = standard |
| Accessories | Included mount and sunshade | X = standard mount + sunshade, M = marine mount + sunshade |
The datasheet example is FS20XP-SMGXX, which is the stainless-steel, M25-entry kit with the standard SM4 mount and SH-002 sunshade. The aluminium enclosure is described as low-copper aluminium with marine-grade paint; the stainless-steel enclosure is electropolished CF8M.
FS20X Plus technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Honeywell / FS20X Plus (ordered as FS20XP-) |
| Technology | UV and three-band IR flame detection |
| Field of view | Oval cone, 100° horizontal and 90° vertical; horizontal view can extend to 120° at half of the on-axis distance |
| Sensitivity (0.1 m² n-heptane) | Low 20 m, medium 40 m, high 59 m, very high 84 m, configured through FlameManager |
| Response time | Typically 5 s, maximum 10 s |
| Operating voltage | 24 Vdc nominal, 18 to 32 Vdc, regulated |
| Power consumption | 1.8 W nominal, 2.4 W in alarm, 12 W maximum with heater on continuously |
| Output relays | Alarm, fault and auxiliary, SPDT, 2 A at 32 Vdc, energised or de-energised, latching or non-latching |
| Analog output | 4-20 mA, source, sink or isolated |
| Digital communications | Modbus RS-485; FP2 over RS-485 or USB; HART 7 over 4-20 mA |
| Operating temperature | -55 to +75 °C (North America -50 to +75 °C) |
| Storage temperature | -55 to +85 °C (North America -50 to +85 °C) |
| Humidity | 0 to 99 % RH |
| Entries | 2 x M25 or 2 x 3/4 in NPT |
| Enclosure | IP66/67 (Type 4X); low-copper aluminium with marine-grade paint or electropolished CF8M stainless steel |
| Weight (without accessories) | Aluminium 1.7 kg, stainless steel 3.4 kg |
Flame response by fuel for the FS20X Plus
The datasheet gives measured response distances at very high sensitivity, outdoors, with a typical response of 5 seconds. Fire size is 0.3 m x 0.3 m for liquid pool fires and a 9.5 mm orifice jet for gases, unless stated. The ratio between very high, high, medium and low sensitivities is roughly 100 %, 75 %, 50 % and 25 %.
| Fuel | Distance at very high sensitivity |
|---|---|
| n-Heptane | 84 m |
| IPA | 61 m |
| Diesel | 61 m |
| Kerosene | 49 m |
| Methanol | 32 m |
| Ethanol | 49 m |
| Methane | 30 m |
| Butane | 59 m |
| Propane | 61 m |
| Hydrogen | 27 m |
| Acetylene | 34 m |
| Syngas | 27 m |
| Silane | 21 m |
The spread matters for design. The gas-jet distances for hydrogen, methane and silane are much shorter than the heptane figure, so a layout based on the heptane distance alone would overstate coverage. Always use the distance for the worst credible fuel at your site.
Where the FS20X Plus fits in the system
The FS20X Plus connects to a fire and gas panel or PLC through relays or the 4-20 mA loop, and to a maintenance laptop through FlameManager over HART or USB. FlameManager is the PC application used for set-up and includes post-event analysis with the Honeywell FirePic tool. The opto-electronics module can be swapped in the field, which shortens repairs. Related models include the FS20X (UV/dual IR/VIS) and the FSL100 series for light-duty indoor zones.
Selecting the FS20X Plus: checklist
- Material: stainless steel for offshore and coastal sites, aluminium where corrosion risk is lower.
- Entries: M25 or 3/4 in NPT.
- Mount: standard SM4 or marine SM4-M, both with the SH-002 sunshade included in the kit.
- Approvals: the datasheet lists ATEX, IECEx and cFMus hazardous-area marks, plus FM 3260, EN 54-10 classes, IEC 61508 SIL 2 and marine approvals. It marks CU-TR, CCC and the marine approvals as pending, so ask us to check certificate status for your project.
- Fuels and distances: compare your design fire to the response table above.
- Output: confirm whether you need mA source, sink or isolated, and HART 7 or Modbus.
Installation and maintenance notes for the FS20X Plus
The included SM4 mount and sunshade make mechanical installation simpler than with the older FS20X, which needs a separate bracket. A sunshade is useful in the Gulf, where direct sun heats the housing. Use shielded cable and keep the supply within 18 to 32 Vdc; at the maximum 12 W heater load, size the power supply for the whole detector group, not just average draw.
For maintenance, keep the window clean, run the site function test, and use FlameManager to check status and review events. If a module fails, the opto-electronics section can be replaced without changing the whole housing.
Typical FS20X Plus applications in Oman and the GCC
The ability to see hydrocarbon, non-hydrocarbon and hydrogen fires in one device suits mixed-fuel facilities: gas processing plants, refineries and petrochemical units, power stations, desalination and utilities sites with fuel storage, and loading terminals. High ambient temperatures, dust and coastal humidity are routine in the region, and the -55 to +75 °C range, IP66/67 enclosure and stainless-steel option address those conditions.
Information to send with an FS20X Plus RFQ
- Full FS20XP- part number, or material, entry type and mount preference.
- Design fuels and maximum viewing distance.
- Required approvals and the site hazardous-area classification.
- Output and protocol: relay, mA mode, Modbus, HART 7.
- Quantity and delivery timing.
Documents and quotation
A Honeywell FS20X Plus datasheet is attached on this page, with the part-number pattern, response table and approval list used in this description.
Send the FS20XP- part number or your option choices and the quantity, and Seven Star LLC will confirm availability and reply with a quotation.
Other Models in the Honeywell Flame Fs20x Range
Seven Star LLC supplies models from the Honeywell Flame Fs20x range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Honeywell FS20X UV/Dual IR/VIS Flame Detector | Fire & Gas Detectors | View details |
| Honeywell FS20X Plus UV/3IR Flame Detector | Fire & Gas Detectors | You are viewing this model |
Datasheets & Documents
- Datasheet Honeywell FS20X Plus Datasheet Download
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About brand
Honeywell is the American industrial technology group whose products on this site cover gas and flame detection, pressure transmitters, flow measurement, gas metering, fire alarm systems and helicopter rotor balancing equipment. Its roots go back to a thermostat business in Minneapolis in 1885 and to Mark Honeywell's heating company, which merged with it in 1927. Several brands we list have joined Honeywell over the years: Gent fire systems of Leicester (part of Honeywell since 2005), Chadwick-Helmuth (a Honeywell business unit from 2002) and Elster gas metering (acquired around the end of 2015).
Seven Star LLC is an independent supplier in Muscat. We list Honeywell gas detectors and sensors, transmitters, Elster gas meters and flow computers, Gent fire alarm equipment and Chadwick-Helmuth balancers, and supply them and their spares in Oman and the GCC by part number.
Honeywell company profile
| Origins | 1885, Minneapolis (Butz thermostat business); merged with Mark Honeywell's company in 1927 |
|---|---|
| Brands in our range | Honeywell Analytics gas detection, SmartLine transmitters, Elster gas metering, Gent fire detection, Chadwick-Helmuth rotor track and balance |
| Gent | Founded in Leicester, UK, around 1872 by John Thomas Gent; part of Honeywell since 2005 |
| Elster | Gas, water and electricity metering; bought by Honeywell from Melrose, deal completed around the end of 2015 |
Milestones
- 1885: The Butz thermostat business starts in Minneapolis.
- 1927: It merges with Mark Honeywell's company.
- 2005: Gent fire detection (Leicester, UK) becomes part of Honeywell.
- 2015: Honeywell completes the purchase of Elster from Melrose around the end of the year.
Honeywell products we list
| Family | Models | Typical use |
|---|---|---|
| Fixed gas detectors | Searchline Excel, Searchline Excel Plus, 02104-N-XSSA, Sensepoint XCD RTD, Sensepoint XCD IR, XCD H2, Sensepoint XCL, Sensepoint XRL, OmniPoint, RAEGuard 2 PID | Flammable, toxic and VOC gas detection in process areas |
| Sensors, flame detection and control | SR-W-MP75C LEL sensor, SR-X2V O2 sensor, FS24X Plus flame detector, R4343E flame switch, System 57 card, 5704FS panel | Replacement sensors, fire detection and gas detection control panels |
| Transmitters and flow | SmartLine STG700, STG800, STR82D remote seal, VersaFlow Coriolis | Process pressure and mass flow measurement |
| Elster gas metering | Q.Sonic plus, TRZ2, Quantometer, RABO, IRM-3 DUO, EK280, EC 350, enCore FC1, enCore ZM1, gas-net F1, gas-net D2, GasLab Q2, USM display | Gas meters, volume correction and fiscal flow computing |
| Gent fire alarm systems | Vigilon Plus, Vigilon Compact Plus, Nano, Xenex, S-Quad detector, S-Cubed, ALD302 base, S4-34420 interfaces, loop card, repeat panel, mimic panel, XENS-850 call point, 74430 bell | Addressable and conventional fire alarm systems in buildings and plants |
| Chadwick-Helmuth rotor track and balance | 8500C, 8500C Plus, Vibrex 2000, Model 11, photocell system, printer, bracket, protractor | Helicopter rotor track and balance and propeller balancing |
Gas detection uses two basic approaches. Point detectors such as the Sensepoint XCD measure the gas at one location, with a catalytic or infrared sensor for flammable gas and an electrochemical cell for toxic gas such as H2S. Open path detectors such as the Searchline Excel send an infrared beam across an area up to a few hundred metres long and detect a gas cloud anywhere along it. Infrared sensors cannot be poisoned the way catalytic beads can, which matters on sites with silicones or H2S.
Where Honeywell products are used
In Oman and the GCC, Honeywell gas detectors protect wellheads, gas plants, refineries and tank farms. Elster meters and flow computers measure gas at city gate stations and in industry. Gent systems are installed in commercial buildings, hospitals and hotels, and Chadwick-Helmuth balancers are used by helicopter operators.
Ordering Honeywell products: what we need
Send the part number from the label (for example 02104-N-XSSA or SPXCDASMTXF). For gas detectors, add the gas, range, output and certification. For gas meters, add size (DN), flow range and pressure rating. For Gent equipment, add the panel type and loop protocol.
Facts checked against Honeywell press releases and SEC filings, and published histories of Gent and Chadwick-Helmuth, October 2026.
Browse Honeywell products by category: Fire & Gas Detector, Vibration, Flowmeters, Pressure Instrumentation, Temperature Instrumentation.
FAQ
Questions about the Honeywell FS20X Plus UV/3IR Flame Detector
Answers from our engineering team on installation, compatibility and integration.
01What kinds of fire does the FS20X Plus respond to?
It is designed to respond to hydrocarbon, non-hydrocarbon and hydrogen fires in one device, using UV and three-band IR sensing. The aim is that you do not need to specify a separate specialty detector for hydrogen or for non-carbon fuels.
02How do I read an FS20XP- part number?
The datasheet shows the pattern FS20XP- followed by material (S stainless steel, A aluminium), entries (M for M25, N for 3/4 in NPT), approvals (G for global), a reserved X, and accessories (X standard mount plus sunshade, or M marine mount plus sunshade). The example given is FS20XP-SMGXX.
03What range does the FS20X Plus achieve on a heptane fire?
For a 0.1 m² n-heptane fire, the datasheet lists 20 m at low, 40 m at medium, 59 m at high and 84 m at very high sensitivity. Typical response time is 5 seconds with a maximum of 10 seconds.
04Which communication options are included?
Modbus RS-485, the Honeywell FP2 protocol over RS-485 or USB, HART 7 over the 4-20 mA loop, three relays and a 4-20 mA output that can be configured as source, sink or isolated. These are standard rather than separate ordering codes.
05What temperature range does the FS20X Plus cover?
Operating temperature is -55 to +75 °C, or -50 to +75 °C for North America, with storage from -55 to +85 °C. Humidity is 0 to 99 % RH and the enclosure is IP66/67, Type 4X.
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