1-3.3.3 Adjusters (continued)
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.
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.
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.
EXTERNAL ACCESSORY DEVICES
The following external accessory devices are manufactured or selected for use with the CD800/830 or
CD802/832 basic system:
115 VAC Explosion-proof Alarm Horn
115 VAC Weatherproof Alarm Horn 352-254
5 AMP, 120V, DPDT Standard Relay
5 AMP, 120V, DPDT Hermetically Sealed Relay
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.