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Model 300E Carbon Monoxide Analyzer
Instruction Manual
THEORY OF OPERATION
P/N 04288 Rev: A
179
AC POWER
ENTRANCE
ON/OFF
SWITCH
Cooling Fan
Mother
Board
CPU
PS 1 (+5 VDC; ±15 VDC)
PS 2 (+12 VDC)
Display
Keypad
Pressure
Sensors
IR Source
Pump
GFC
Wheel
Motor
Sync/Demod
M/R &
Segment
Sensors
Heaters
Valve
Options
KEY
AC POWER
DC POWER
RELAY
BOARD
Figure 10-14: Power Distribution Block Diagram
10.4. Interface
The analyzer has several ways to communicate the outside world, see Figure 10-15.
Users can input data and receive information directly via the Front Panel keypad
and display. Direct communication with the CPU is also available by way of the
analyzers RS232 & RS485 I/O ports or an optional Ethernet port. The analyzer can
also send and receive different kinds of information via its External Digital I/O
connectors and the three Analog Outputs located on the Rear Panel.