Teledyne 3220 - Multi-channel oxygen monitor system - Manual (Page 21)

Oxygen Monitor System 2 Operational Theory
Teledyne Analytical Instruments 7
Figure 2-1: Control Unit Front Panel
An audible alarm is actuated when any alarm state occurs. This
audible alarm may be disconnected by switching the AUDIBLE
ALARM control switch to the BYPASSED position. When this is done,
the red lamp on the system module is illuminated as an indication that
the audible alarm is not functioning. A block diagram of the Control
Unit is shown in Figure 2-2.
The Control Unit is the power entry and distribution point. The
3220 system contains universal power supplies that operate on 100-240
VAC, 50/60Hz. The power switch on the Control Unit switches power
for the entire system. The line is protected by two 3 Amp fuses,
accessible from the front panel.
Figure 2-2: Control Unit Block Diagram