Teledyne 3300TB operating instructions Electronics, General, Signal Processing

Trace Oxygen Analyzer Operational Theory 2

2.3Electronics

2.3.1 General

The signal processing uses an Intel microcontroller with on-board RAM and ROM to control all signal processing, input/output, and display functions for the analyzer. System power is supplied from a universal power supply module designed to be compatible with most international power sources.

The power supply circuitry is on the Power Supply PCB, which is mounted vertically, just behind the rear panel of the Control Unit.

The signal processing electronics including the sensor amplifier, microcontroller, analog to digital, and digital to analog converters are located on the Main PCB, which is mounted vertically, just behind the front panel of the Control Unit.

2.3.2 Signal Processing

Figure 2-3 is a block diagram of the signal processing electronics described below.

MFC

TEMPERATURE COMPENSATION NETWORK ON SENSOR PCB

Millivolt

Potput

SENSOR AMPLIFIER

A D C

E–I CONV 4–20 mA dc

Microamp

Output

B-2C Sensor

MICRO- CONTROL- LER

Concentration

0–10 V dc

D A C RANGE ID

KEYBOARD

DISPLAY

RELAYS

ALARMS

RELAYS

ALARMS

Figure 2-3: Block Diagram of the Signal Processing Electronics

Teledyne Analytical Instruments 2-5