Teledyne 3220 - Multi-channel oxygen monitor system - Manual (Page 22)

2 Operational Theory Model 3220
Teledyne Analytical Instruments 8
A 1/8 A fuse is furnished for the electronic circuitry of the Control
Unit. The green power LED indicates that the Unit is ON.
Alarm switch S2 has two positions. Normally, the switch is set to
the ACTIVE position which provides for audible alarm when any of the
Channel Modules goes into the alarm state. When set to the BYPASS
position, the local audible alarm is turned off.
2.4 Channel Module
The Model 3220 Oxygen Gas Analyzer uses an Intel
Microcontroller with on-board RAM and ROM to control all signal
processing, input/output, and display functions for the analyzer. The
channel power is supplied from separate universal power supply
modules (100-240 VAC), designed to be compatible with most
international power sources. The power supply (triple outputs) supplies
the voltages for logic devices and analog circuitry.
A block diagram of the functional relationships of the Channel
Module is shown in Figure 2-3.