Total Organic Carbon Analyzer
Theory of Operation
Teledyne Analytical Instruments
17
2.4.4 NDIR CO
2
Gas Detection
The key component for reliable TOC analysis is the precise and
interference-free detection of CO
2
. The Model 6750 NDIR unit requires
very little maintenance because of its ability to handle the corrosive
gases generated in TOC analysis. This is due in part to its non-reflective
borosilicate sample cell. It has no moving parts which further reduces
the maintenance load and it uses an internal self-calibrating technique.
The NDIR unit is shown in Figure 2-10. Some of the features of the
NDIR unit are as follows:
•
Specific, interference-free CO
2
detection
•
Dual-wavelength rationing compensates for drift
•
Computer-controlled for accuracy
•
Sapphire protected optics
•
Non-corrosive, non-reflective sample cell (borosilicate)
•
No moving parts or tools required for easy maintenance and
service
•
No critical realignment required
Figure 2-10: Model 6750 NDIR Unit
The NDIR CO
2
detector uses a completely solid state, dual
wavelength ratioing technique with a single borosilicate sample cell that
Summary of Contents for 6750
Page 16: ...Introduction Model 6750 Teledyne Analytical Instruments 4 ...
Page 32: ...Theory of Operation Model 6750 Teledyne Analytical Instruments 20 ...
Page 40: ...Installation Model 6750 Teledyne Analytical Instruments 28 ...
Page 92: ...Appendix Model 6750 Teledyne Analytical Instruments 80 ...