Teledyne LGA-3500 - Laser Gas Analysis system - Manual (Page 21)

Laser Gas Analyzer Operational Theory
Teledyne Analytical Instruments 7
Operational Theory
2.1 Introduction
The Model 3500 Laser Gas Analysis System is a high precision gas
concentration measurement and monitoring system capable of on-the-
spot online operation. It is comprised of three subsystems:
1. Central Processing Unit (Control Unit)
2. Analysis Section
3. Purge System
In the analysis section, the transmitter launches a laser beam across
the diameter of the industry pipe under test onto the receiver placed at
the other end. The resulting electrical signal is then sent to the central
processing unit and analyzed to yield the gas concentration and
displayed on the LCD screen. Signal and relay output is taken from the
power supply/control box. See Figure 2-1.
Figure 2-1: System Diagram for the Model 3500 Series Analyzers