User manual ACR ELECTRONICS SM-2 STROBING MAN-OVERBOARD LIGHT

[. . . ] The SM-2 is a lightweight, compact, battery operated, portable unit which uses modular construction for basic circuits to simplify maintenance and replacement procedures. The SM-2 has been redesigned and strengthened to pass the tough UL 1196 testing and MSC. 81(70) 1. 2 PURPOSE This unit, shown in Figure 1, is a portable, electronic, floating strobe light, which automatically rights itself and begins flashing when dropped into water. The SM-2 Light is designed to be carried aboard all vessels, as well as artificial islands and fixed structures which are located on the outer continental shelf. [. . . ] It can be used to attach a life buoy ring. 1. 10 LENS The lens is made of a colorless, polycarbonate plastic (lexan) which is free mechanical defects which would impede its primary function of radiating light. The Lens is of such design as to withstand all impact tests that are required in this application. 1. 11 BALLAST Ballast consists of a metallic weight permanently secured in the bottom of the case. 1. 12 MOUNTING BRACKET The mounting bracket is designed to hold the light in the inverted position and prevent free movement of the light when properly secured within the bracket. The bracket is made of a corrosion-resistant plastic and is arranged for mounting on a vertical surface. 1. 13 DIMENSIONAL STABILITY AND VAPOR PROOFNESS The SM-2 Light is capable of undergoing specified temperature humidity cycles with no signs of shrinkage or distortion which might impair its serviceability, watertightness or vapor proofness. The watertight integrity of the equipment is assured by O-Ring seals between surfaces. The unit's ability to withstand any anticipated external forces is assured by the combination of material strength and assembly methods. 4 Y1-03-0165 Rev. B 1. 14 STROBOSCOPIC FLASHING LIGHT The SM-2 Flashing Light uses a capacitor discharge xenon flashtube and meets the following requirements. A completely sealed solid state circuit converts power from the battery and supplies it to the flashtube. A suitable capacitor discharge, xenon flashtube is provided which is compatible with the electronic flashing circuit and lens which will provide the required light output. The light will flash at a rate of 60 ± 1 flashes per minute with a minimum intensity of 2 CD for a minimum of 15 hours. Light from each flash is radiated in all directions of upper hemisphere. 1. 15 BATTERY CONNECTION All operating voltages are furnished by an integral battery pack. (Shipped without battery from factory) Electrical connections between the main circuit board and the associated battery are accomplished by the use of clearly marked terminals and color-coded lead wires. 1. 16 BUOYANCY The SM-2 is independently buoyant and will float for an indefinite time interval with the center of the flashtube at least 2 inches above the water surface. A matter of balance Marker lights, by design need not only to float upright for maximum visibility. Although these batteries are the same size, their different chemistries cause them to have varying weights. It is imperative that only the 6 volt battery models suggested are used. Too little ballast and the light will lie over on its side and be ineffective; too much weight and the light could sink. If you have any doubts that you are using a battery of appropriate weight, test the light by placing it into shallow water. The results will be obvious; if the light floats upright, it's good. Maximum battery weight: 675 grams (1. 49 lbs) (See list of suggested batteries on Page 1) 5 Y1-03-0165 Rev. [. . . ] Depress the top cap of the unit, by pushing straight down on the top cap assembly, until the swivel locks may be turned outward, clear of the cap. Grip the light lens (using a clean cloth or gloves for a better grip on the smooth surface and to avoid marring the lens surface) and pull upwards until the top cap is clear of the case. Turn the unit on its side, open end slightly downwards, to allow the foam filler and battery to slide out. [. . . ]