Description
THORN SECURITY
TYCO FLAME VISION
FV421I
FLAME DETECTOR
PCB 125.165.601 IS.1
ASSY. 125.685.168
120-447-018-FR4
125.685.168-01
EX IA IIIC T88C D
TA:-40C TO +80C
EX IA IIC T4 GA
TA:-40C TO +80C
EX IA IIC T5 GA
TA:-40C TO +40C
IECEX
BAS14.013X
The Tyco Thorn Security FV421I is a Flame Vision flame detector used within a ship’s fire alarm system, where it watches for flame in the protected area and reports to the detection panel. Its Ex ia markings cover gas group IIC at T4 Ga and T5 Ga, and dust group IIIC at T88C D, with ambient ranges of -40°C to +80°C, or -40°C to +40°C for the T5 rating, under IECEx certificate BAS14.013X. The assembly is identified as 125.685.168 with PCB 125.165.601 IS.1. The unit is supplied in Used condition.
Key Features
✓ Flame Vision FV421I flame detector
✓ Ex ia IIC T4 Ga, Ta -40°C to +80°C
✓ Ex ia IIC T5 Ga, Ta -40°C to +40°C
✓ Ex ia IIIC T88C D, Ta -40°C to +80°C
✓ IECEx certificate BAS14.013X
Marine Applications
✓ Engine room and purifier room flame detection
✓ Fuel oil and lube oil handling areas
✓ Gas-hazardous zones on tankers and gas carriers
✓ Boiler room and emergency generator room fire alarm loops
Technical Support
Prota Marine provides technical support, repair and onboard installation for the flame detector and the wider fire alarm system. We help trace faults on flame detection circuits and give commissioning support when the detector is brought back into service.




