EXTERNAL ACCESSORY DEVICES

TM 10-6665-297-13&P 1-3.3.3 Adjusters (continued) 6. ALARM Signal Trigger Point Adjuster : Potentiometer with adjustment screw; labeled ALARM on printed circuit board (all models, Figures 1-19, 1-22). This adjuster is turned to set a reference voltage in a circuit that triggers the alarm signal output circuitry when the gas signal rises to the alarm reference voltage level. 7. Recording Signal Level Adjuster : Potentiometer with adjustment screw; labeled RECORD on CD800/830 circuit board (Figure 1-19), and REC on CD802/832 circuit board (Figure 1-22). This adjuster is turned to set the recorder signal output to drive an optional external recorder to record values consistent with the percent L. E. L. meter readings. Like the percent L. E. L. meter, the recorder output will display either the channel with the higher output or the channel on which the channel selector switch is set. 8. Meter Zero Mechanical Adjuster: Screw adjuster under meter, all models, turned to set meter pointer to zero with instrument power off. This mechanical movement adjuster is not to be used as a substitute or compensation for electrical adjustments. 1-4 EXTERNAL ACCESSORY DEVICES The following external accessory devices are manufactured or selected for use with the CD800/830 or CD802/832 basic system: Audible Buzzer 356-183 115 VAC Explosion-proof Alarm Horn 356-215 115 VAC Weatherproof Alarm Horn 352-254 5 AMP, 120V, DPDT Standard Relay 361-251 5 AMP, 120V, DPDT Hermetically Sealed Relay 361-252 In addition to the above accessories available from the Bacharach Instrument Company, a wide variety of external devices such as fans, sprinklers, door-closers and process control mechanisms may be controlled by the basic system. Such devices may be connected directly to the control unit where resistive load current does not exceed 3 amperes at 115 VAC or 30 VDC. External devices with higher current ratings may be operated through an auxiliary power relay wired to the controlling unit. 23-9617 7/1/76 1-35