Section 127.201 - Sensing and alarm systems(a) Fixed sensors must have audio and visual alarms in the control room and audio alarms nearby.(b) Fixed sensors that continuously monitor for LNG vapors must-(1) Be in each enclosed area where vapor or gas may accumulate; and(2) Meet Section 16.4 of NFPA 59A (incorporated by reference, see § 127.003 ).(c) Fixed sensors that continuously monitor for flame, heat, or products of combustion must- (1) Be in each enclosed or covered Class I, Division 1, hazardous location defined in Section 500.5(B)(1) of NFPA 70 (incorporated by reference, see § 127.003 ) and each area in which flammable or combustible material is stored; and(2) Meet Section 16.4 of NFPA 59A (incorporated by reference, see § 127.003 ).CGD 78-038, 53 FR 3376, Feb. 7, 1988, as amended by USCG-2019-0444, 87 FR 5690 , Feb. 2, 2022