Teledyne 100AH instruction manual Instrument Description, Sensor Module, Reaction Cell, Detector

Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D

4.2Instrument Description

4.2.1Sensor Module, Reaction Cell, Detector

The sensor module (Figure 10-6)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

C.PMT cooler temp control

6.Electric and optic test electronics

7.Light trap

8.UV lamp and UV detector

4.2.2 Pneumatic Sensor Board

The pneumatic sensor board consists of two pressure sensors mounted on the flow control module. One pressure sensor measures the upstream of the flow control module which is near ambient pressure. The second pressure sensor measures reaction cell’s pressure which is about one-quarter of ambient pressure. From these two pressure the sample flow rate can be computed and is displayed as sample flow in the test menu including two pressure readings. The M100AH displays pressure in inches of mercury-absolute (in-Hg-A) and flow in cc/min.

4.2.3 Computer Hardware and Software

The M100AH Analyzer is operated by a 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 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.

4-3