Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 23
4.5 Field of View Restrictor
There are some unique and specialized applications that may require a restricted field of view in order to
prevent the Detector from alarming to a known (friendly) fire/flame source (such as a flare stack). The Model
FVR-01 Field-of-View Restrictor is easily modified in the field with a simple hack saw to obtain custom
Detector field-of-views for applications where specific narrow field-of-views are required. The Model FVR-01
Detector accessory has been developed specifically for these unique types of applications. Use of the
restrictor has not been certified to the EN54-10 standard.
4.6 Additional Performance Specifications
4.6.1 Flame Response Sensitivity
The following table provides FS20X typical indoor response times & distance to various fuels:
FS19X/FS20X MultiBand IR plus UV Detector
Fuel Fire Size Distance Typical Response
Acetylene 12 in (0.30 m) Plume - Medium Flame 35 ft (10.7 m) 2 Seconds
Acetylene 10 - 12 in (0.25 - 0.30 m) Plume - Lazy Flame 40 ft (12.2 m) < 2 Seconds
Diesel 6 in X 6 in (15.2 cm X 15.2 cm) 87 ft (26.5 m) < 3 Seconds
Ethanol 12 in X 12 in (0.3 m X 0.3 m) 50 ft (15.2 m) < 3 Seconds
Hydrogen 3/8 in dia. (9.5 mm) orifice, 32 in (0.8 m) Plume 85 ft (25.9 m) < 3 Seconds
IPA 6 in X 6 in (15.2 cm X 15.2 cm) 87 ft (26.5 m) < 3 Seconds
JP4 6 in X 6 in (15.2 cm X 15.2 cm) 75 ft (22.9 m) < 3 Seconds
JP8 6 in X 6 in (15.2 cm X 15.2 cm) 87 ft (26.5 m) 3 Seconds
Methane 3/8 in dia. (9.5 mm) orifice, 32 in (0.8 m) Plume 70 ft (21.3 m) < 3 Seconds
Methanol 12 in X 12 in (0.3 m X 0.3 m) 40 ft (12.2 m) < 3 Seconds
n-Heptane 6 in X 6 in (15.2 cm X 15.2 cm) 87 ft (26.5 m) < 3 Seconds
Silane 1/32 dia (0.8 mm) orifice, 12 in (0.3 m) Plume 30 ft (9.1 m) < 2 Seconds
The following table provides FS20X typical outdoor response times & distance to various fuels:
FS19X/FS20X MultiBand IR plus UV Detector
Fuel Fire Size Distance Typical Response
Acetylene 12 - 16 in (0.30 - 0.41 m) Plume - Large Flame 100 ft (30.5 m) < 3 Seconds
Acetylene 12 in (0.30 m) Plume - Medium Flame 100 ft (30.5 m) < 4 Seconds
Acetylene 10 - 12 in (0.25 - 0.30 m) Plume - Lazy Flame 90 ft (27.4 m) < 3 Seconds
Diesel 12 in X 12 in (0.3 m X 0.3 m) 150 ft (45.7 m) 4 Seconds
Ethanol 12 in X 12 in (0.3 m X 0.3 m) 60 ft (18.3 m) < 3 Seconds
Hydrogen 3/8 in dia. (9.5 mm) orifice, 32 in (0.8 m) Plume 75 ft (22.9 m) < 3 Seconds
IPA 12 in X 12 in (0.3 m X 0.3 m) 150 ft (45.7 m) < 3 Seconds
JP4 12 in X 12 in (0.3 m X 0.3 m) 150 ft (45.7 m) < 4 Seconds
JP8 12 in X 12 in (0.3 m X 0.3 m) 150 ft (45.7 m) < 4 Seconds
Methane 3/8 in dia. (9.5 mm) orifice, 32 in (0.8 m) Plume 60 ft (18.3 m) 2 Seconds
Methanol 12 in X 12 in (0.3 m X 0.3 m) 40 ft (12.2 m) < 2 Seconds
n-Heptane 12 in X 12 in (0.3 m X 0.3 m) 200 ft (61.0 m) < 4 Seconds
Silane 1/32 dia (0.8 mm) orifice, 12 in (0.3 m) Plume 50 ft (15.2 m) < 3 Seconds
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