Instrument Description; Sensor Module, Reaction Cell, Detector; Pneumatic Sensor Board; Computer Hardware And Software - Teledyne 6400A Instruction Manual

Sulfur dioxide analyzer

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TAI Model 6400A SO

4.2 Instrument Description

The sensor module (Figure 9-7) is where the fluorescence light is generated and detected. It is

the most complicated and critical sub-assembly in the entire analyzer. It consists of the following

assemblies and functions:

1. The reaction cell

2. Reaction cell heater/thermistor

3. PMT and HVPS (high voltage power supply)

4. PMT cooler/cold block/heatsink/fan

5. Preamp assembly:

A. Preamp range control hardware

B. HVPS control

PMT cooler temp control

C. Electric and optic test electronics

Light trap and UV detector

6. UV lamp and light shutter

The sensor board consists of a pressure sensor and a flow sensor. The pressure sensor measures the

sample pressure at the reaction cell which is near ambient pressure. This sample pressure is

displayed in the test menu. A solid state flow sensor measures the sample flow. Likewise, it is

displayed as a TEST function. The 6400A displays pressure in inches of mercury-absolute (in-Hg-

A) and flow in cc/min.

The 6400A Analyzer is operated by an 8088 type micro-computer. The computer's multitasking

operating system allows it to do instrument control, monitor test points, provide analog output and

provide a user interface via the display, keyboard and the RS-232 port. These operations appear to

be happening simultaneously but are actually done sequentially based on a priority queuing system

maintained by the operating system. The jobs are queued for execution only when needed, therefore

the system is very efficient with computer resources.

Analyzer Operator Manual, 02164, Rev. G

4-4

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