Honeywell FS20X Multi-Spectrum UV / Dual IR Flame Detector

FS20X is a Honeywell multi-spectrum UV / dual IR / visible (VIS) flame detector from the FSX family of electro-optical detectors. A solar-blind UV sensor combined with WideBand IR gives a detection range up to 60 m to a 0.1 m2 n-heptane fire, with a 3-5 second response at 30 m. 4-20 mA, relay and RS-485 Modbus outputs; FM, ATEX / IECEx Ex db IIC, CU-TR and INMETRO approvals; 4X / IP66 enclosure.

How does FS20X differ from FS24X Plus and FSL100?

FS20X differs from FS24X Plus and FSL100 in sensing technology and housing. FS20X: solar-blind UV + dual IR + visible, 15-60 m range, aluminium or 316 stainless steel IP66 / 4X enclosure, -40 to +85°C operating temperature, HART as an optional module (not available on EN54-10 units). FS24X Plus: triple IR (IR3), 15-60 m range, -55 to +75°C, IP66/67, SIL 2 and EN54-10, with HART and Modbus. FSL100: UV, UV/IR or IR3 versions, GRP housing IP65, 25-35 m range, ATEX zone 2/22.

FS20X specifications

• Brand: Honeywell
• Product type: Multi-spectrum UV / dual IR / visible (UV/Dual IR/VIS) fire and flame detector
• Field of view: 90° horizontal cone of vision, ±45° from on axis
• Sensitivity / range: Very high 60 m, high 45 m, medium 30 m, low 15 m (switch selectable)
• Response time: 3-5 seconds to a 0.1 m2 n-heptane fire at 30 m; 3-10 seconds at 60 m
• Spectral sensitivity: Ultraviolet 185-260 nm; visible 400-700 nm; near-band IR 0.7-1.1 microns; wide-band IR 1.1-3.5 microns
• Operating voltage: 24 VDC nominal (18-32 VDC), regulated
• Power consumption: 85 mA operating; 135 mA alarm; additional 155 mA heater (heater turns on at -17°C)
• Output relays: Fire alarm: SPDT (NO/NC); fault: SPST (NO); auxiliary: SPDT (NO/NC); de-energised / energised, latching / non-latching; contacts rated 1 A at 24 VDC
• Analog output: 0-20 mA stepped, source or sink user selectable; loop resistance 50-400 Ohm
• Communication: One of the following, user selectable: RS-485 Modbus, RS-485 FireBus II, RS-485 Special (optional); HART via optional plug-in module (not available on EN54-10 units)
• Temperature range: Operating -40 to +85°C; storage -55 to +110°C
• Humidity range: 5 to 98% relative humidity, non-condensing
• Conduit entries: Standard: two M25 or two ¾” NPT
• Enclosure materials: Copper-free powder-coated aluminium or 316 stainless steel
• Enclosure type: 4X, IP66 and NEMA 4
• Shipping weight: Aluminium 1.6 kg; stainless steel 3.2 kg
• FM certification: Class I Div 1 and 2 Groups B, C, D; Class II Div 1 and 2 Groups E, F, G; Class III (the order code descriptions state Groups A, B, C, D); FM 3260
• ATEX / IECEx certification: II 2 G Ex db IIC T4 (Ta -40 to +110°C), T5 (Ta -40 to +75°C), T6 (Ta -60 to +60°C), II 2 D Ex tb IIIC T135°C; a further version T4 (Ta -60 to +110°C), T5 (Ta -60 to +75°C), T6 (Ta -60 to +60°C)
• Other certifications: INMETRO; CU-TR; meets SIL 2 requirements (FMEDA on request); EN54-10:2002 (option, certificate 1175a/01 LPCB, CPR 0832-CPR-F0515); EN 61000-6-4 and EN 50130-4
• Warranty: Three years from date of shipping

Technology features

Dual microprocessors give fail-safe operation: the master performs high-speed digital sampling and signal processing, the slave handles sensor data, communications, self-diagnostics and event log storage. It stores up to 200 time-stamped events and up to 6 pre-fire FirePic records. If the UV signal is degraded by heavy smoke or a contaminated lens, the WideBand IR, near-band IR and visible sensors still alarm at reduced sensitivity and slower response. It has automatic optical-path and electronic self-test, a real-time clock, plug-in terminations for field installation and PC software with an FSIM interface for diagnostics.

Order codes

Code descriptions follow CAD’s / Honeywell’s document. FS20X-211 is the standard version, FS20X-212 the version with the FSX-A014 HART module factory installed.

Applications

The datasheet lists these applications: refineries and oil production facilities, offshore platforms, turbine / compressor enclosures, acetylene processing and storage, oil and gas pipelines and pumping stations, LNG / LPG loading and unloading facilities, natural gas and CNG plants, ethanol, methanol and IPA production and storage, crude oil and gasoline storage and tank farms, aircraft hangars, hydrogen plants and storage, paint and solvent storage, chemical production, storage and loading facilities, power plants, silane gas storage.