TM 10-6665-297-13&P1-2GASDETECTORUNITS(continued)1-2.3DetectorModels(continued)(3) Model23-4017: remote mounting detector housing with integral air aspirator for continuous sampledrawing. Sample gas is transported to the sensor through a length of tubing from enclosed areas,tanks, and vessels not otherwise readily accessible; from high-velocity gas streams; from areascontaining more dirt or moisture than desirable for diffusion sampling; from nitrogen-inertedatmospheres where air blending is required; from elevated-temperature areas (200° F or higher); orany situation where sample conditioning is required. (For example: If flash point of combustiblematerial is greater than 70° F, sample line and detector must be heated to above flash point.)Approved for use in N.E.C. Class I, Division 1, Groups A, B, C, and D hazardous areas.(4) Model800-086: explosion-proof, weatherproof detector housing; diffusion sampling (Figure 1-3).Approved for use in N.E.C. Class I, Division 1, Groups B, C, and D hazardous areas.(5) Model23-7317: explosion-proof, weatherproof housing; diffusion sampling; high-humidity shield toprotect sensor element from heavy moisture content in the air (Figure 1-3). Approved for use inN.E.C. Class I, Division 1, Groups B, C, and D hazardous areas.Catalytic sensor elements in all models have flame arrestors caps to prevent ignition of combustible gases inthe air. Each detector assembly has a 5-layer mesh monel screen enclosing the plug-in sensing element,providing redundant flame-arresting protection.1-3CONTROLMODULESAll CD800/830 and 802/832 control modules contain power regulating and signal processing circuitry, percent L.E.L. indicating meter, indicator lights to signal gas conditions and system operating modes, circuit adjusters,and relays in small, compact units.CD800/830 series and CD802/832 series control modules differ in that each CD800/830 control moduleordinarily monitors a single detector (or if two, the signals from both are summed as if for one), whereas eachCD802/832 control module incorporates two discrete channels for the independent monitoring of signals fromtwo detectors. The CD802/832 control module features a channel selector control that can be set either toAUTO (automatic mode), in which meter and signal lights respond to the channel receiving the strongestsignals from the detectors, or to either of two channel positions, in which meter and signal lights respond to thechannel selected. Alarm, warning, and failure circuitry and indicators remain active for both channels,regardless of the channel-selector control position.23-96177-1-761-6
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