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THEORY OF OPERATION
Model 400E Ozone Analyzer
Instruction Manual
226
P/N 04316 Rev: B
10.3.
Electronic Operation
10.3.1.
Overview
Figure 10-4 shows a block diagram of the major electronic components of the
Model 400E.
IZS UV
Lamp Heater
Analog Outputs
Gas
Pressure
Sensor
Status Outputs:
1 – 8
Control Inputs:
1 – 6
PC 104
CPU Card
Disk On
Chip
Flash Chip
RS–232
ONLY
RS–232 or RS–485
Power-Up
Circuit
I
2
C Bus
Sensor Inputs
Box
Temp
Thermistor
Interface
SAMPLE
TEMP
PHOTOMETER
UV LAMP TEMP
IZS OPTION
UV LAMP TEMP
A1
A2
A3
Optional
4-20 mA
MOTHER
BOARD
A/D
Converter
(V/F)
PC 104
Bus
External
Digital I/O)
COMM B
Female
Analog
Outputs
(D/A)
Zero/Span/Cal
Valve Option
Keybd
&
Display
RELAY
BOARD
I
2
C Status
LED
PUMP
A4
COMM A
Male
CPU
STATUS
LED
Gas
Flow
Sensor
O
3
Detector
Photometer UV
Lamp Power
Supply
Photometer
UV Lamp
Heater
Measure / Ref
Valve
O
3
Detector
Preamp
IZS UV Lamp
Power Supply
IZS
Reference
Detector
Absorption tube
IZS Sample/Cal
Valve
Figure 10-4: 400E Electronic Block Diagram