Table of Contents
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3 Start-up and Theory of Operation
Thermistor
IR
Cell
Source
Motor
Chopper
Temperature
Wheel
Displays
Block Diagram of the Model 7120 Electronics
3-4
7110
Preamp
Pb/Se
Sensor
Heater
Control
Fine
Adjustment
Processing
Power
Supply
Teledyne Analytical Instruments
Auto Zero
Amplifier
A to D
Converter
M
U
X
Auto-
Range
Digitial to
Analog
Converter
Coarse
(DAC)
Adjustment
Central
Processing
Unit
(CPU)
A to D Conv
Model 7120
To CPU
0-1 V dc
Concentration
and Range
4-20 mA dc
Concentration
and Range
Alarm 1
Alarm 2
System
Failure
Alarm
RS-232
Range
Contacts (4)
External
Valve
Control
Remote Span
Control
Remote Zero
Control
Cal
Contact
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Table of Contents
Troubleshooting
