Section 182.480 - Flammable vapor detection systems(a) A flammable vapor detection system required by § 182.410(c) must meet UL 1110 (incorporated by reference; see 46 CFR 175.600 ) or be approved by an independent laboratory.(b) Procedures for checking the proper operation of a flammable vapor detection system must be posted at the primary operating station. The system must be self-monitoring and include a ground fault indication alarm.(c) A flammable vapor detection system must be operational for 30 seconds prior to engine startup and continue sensing the entire time the engine is running.(d) A flammable vapor detection system must provide a visual and audible alarm at the operating station.(e) A sensor must be located above the expected bilge water level in the following locations: (1) The lowest part of a machinery space;(2) The lowest part of a space containing a fuel tank when separate from the machinery space; and(3) Any other location when required by the cognizant OCMI.(f) A flammable vapor detection system must be installed so as to permit calibration in a vapor free atmosphere.(g) Electrical connections, wiring, and components for a flammable vapor detection system must comply with part 183 of this chapter.(h) An operation and maintenance manual for the flammable vapor detection system must be kept onboard.CGD 85-080, 61 FR 986, Jan. 10, 1996, as amended by USCG-2003-16630, 73 FR 65209 , Oct. 31, 2008