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Initial Inspection, 4. Overview, TABLE 3-1., Parts Included with the TGA200A, Part Number

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TGA Series Trace Gas Analyzers 3. Initial Inspection • Upon receipt of a Campbell Scientific TGA, inspect the packaging and contents for damage. File damage claims with the shipping company. Contact Campbell Scientific to facilitate repair or replacement. • Immediately check package contents against shipping documentation. Thoroughly check all packaging material for product that may be trapped inside. Contact Campbell Scientific about any discrepancies. Model numbers are found on each product. On cables, the model number is often found at the connection end of the cable. Check that correct lengths of cables are received. • The TGA200A ships with the separate items listed in TABLE 3-1. TABLE 3-1. Parts Included with the TGA200A Part Number Description 15895 TGA Accessory & Tool Pack 15836 TGA Leak Check Nozzle, 25ft tubing 15838 TGA Test Intake, 5ft tubing 22178 TGA200A SDM Cable, 20ft 15702 Raw Plastic Tubing 1/4 in OD X .040 Wall Polyethylene/Alum 18148 10Base-T CAT5 Ethernet Crossover Cable, 25ft 20730 9-Pin Female to 9-Pin Male Serial Data Cable, 25ft 30723 TGA TEC Support Software & OS 30981 TGA200A Power Module 4. Overview The optical source of Campbell Scientific TGAs is a tunable diode laser that is simultaneously temperature and current controlled to produce a linear wavelength scan centered on a selected absorption line of the trace gas. A beamsplitter allows most of the energy from the laser to pass through a 1.5 m (4.9 ft) sample cell, where it is absorbed proportional to the concentration of the target gas. The portion of the beam that is reflected by the beamsplitter passes through a reference cell containing a prepared reference gas having a known concentration of the target gas. The reference signal provides a template for the spectral shape of the absorption line, allowing the concentration to be derived independent of the temperature or pressure of the sample gas or the spectral positions of the scan samples. The reference signal also provides feedback for a digital control algorithm to maintain the center of the spectral scan at the center of the absorption line. The simple optical design avoids the alignment and contamination problems associated with multiplepath absorption cells. The number of reflective surfaces is minimized to reduce errors caused by Fabry-Perot interference. 3

Section	Page
Revision and Copyright Information	1
Limited Warranty	3
Assistance	4
Precautions	5
Table of Contents	7
1. Introduction	15
2. Cautionary Statements	16
3. Initial Inspection	17
4. Overview	17
4.1 System Components	20
4.1.1 Standard Components	21
4.1.1.1 TGA Power Module	21
4.1.1.2 TGA Accessory & Tool Kit	22
4.1.1.3 TGA Test Intake	22
4.1.1.4 TGA Leak Check Nozzle	22
4.1.1.5 TGA SDM Cable	23
4.1.1.6 Plastic Tubing	23
4.1.1.7 CAT5 Ethernet Crossover Cable	23
4.1.1.8 Serial Data Cable	24
4.1.1.9 TGA TEC Support Software and Operating System	24
4.1.2 Optional Components	25
4.1.2.1 Laser	25
4.1.2.2 AC Mains Power Cord	25
4.1.2.3 Power Module Mounting Brackets	26
4.1.3 Common Accessories	26
4.1.3.1 TGA Reference Gas Connection	26
4.1.3.2 TGA Insulated Enclosure Cover	27
4.1.4 Other Accessories	28
4.1.4.1 TGA Air Sample Intake	28
4.1.4.2 TGA Heated Intake Filter & Orifice	28
4.1.4.3 TGA High-Flow Filter Holder	28
4.1.4.4 Sample Vacuum Pump	29
4.1.4.5 Bypass Vacuum Pump	31
4.1.4.6 Sample Air Dryer	32
4.1.4.7 TGA Rotameter	35
4.1.5 Support Software	36
4.1.6 Replacement Parts	36
4.1.6.1 TGA Heated Intake Filter	36
4.1.6.2 Filter Element	36
4.1.6.3 TGA Filter Elements, 47mm (Qty 100)	37
4.2 Theory of Operation	37
4.2.1 Optical System	37
4.2.2 Laser	39
4.2.3 Dewars	39
4.2.4 Detectors	39
4.2.5 Laser Scan Sequence	40
4.2.6 Concentration Calculation	41
5. Specifications	42
5.1 Measurement Specifications	42
5.2 Physical Specifications	43
5.3 Power Requirements	43
6. Installation	44
6.1 Analyzer Installation	45
6.1.1 Plumbing Connections	47
6.1.2 Data Output Connections	49
6.1.3 Power	51
6.2 TGA Software Installation	53
6.2.1 Installation of PC Software	53
6.2.2 Updating TGA Operating System	54
6.2.3 Configure Ethernet Connection	56
6.2.4 Set TGA Serial Number and Identification String	59
6.2.5 Run the PC Software	60
6.3 Detailed Setup Instructions	60
7. Operation	60
7.1 Routine Operation	60
7.1.1 Startup Procedure	60
7.1.2 Routine System Checks	61
7.1.3 Shutdown Procedure	62
7.2 Software User Interface	63
7.2.1 Connect Window	63
7.2.2 Status Window	65
7.2.3 Settings Window	66
7.2.3.1 Laser	67
7.2.3.2 Detectors	73
7.2.3.3 Calculations	75
7.2.3.4 Other	80
7.2.4 Laser Window	84
7.2.4.1 View Less/View More	85
7.2.4.2 Tabbed/Expand	86
7.2.4.3 Display Mode	87
7.2.4.4 Colors	95
7.2.5 Find	95
7.2.6 Graph	98
7.2.7 Data	101
7.2.8 Files	102
7.3 Data Output	104
7.3.1 SDM Output	104
7.3.1.1 Syntax	105
7.3.1.2 Remarks	105
7.3.2 TGA Output to PC	108
7.3.3 TGA Analog Outputs	108
8. Troubleshooting and Maintenance	108
8.1 Lasers and Detectors	108
8.2 Reference Gas	109
8.3 Filtration and Sample Cell Cleaning	109
8.4 Sample Pumps	109
Appendix A. Configuring TGAs for Specific Gas Species	111
A.1 Laser Selection	111
A.1.1 LN2-cooled lasers	111
A.1.2 TE-cooled Lasers	111
A.1.3 Dewar Cables	112
A.1.4 Changing Lasers	112
A.2 Reference Gas	114
A.3 Detectors	116
A.4 Finding the Absorption Line	116
A.5 Air Gap Purge	117
Appendix B. Optical Alignment	119
B.1 Optical Alignment of TGA100 and TGA100A	119
B.1.1 Initial Alignment	122
B.1.2 Horizontal and Vertical Alignment	123
B.1.3 Focus Adjustment	124
B.1.4 Reference Detector Coalignment	125
B.2 Optical Alignment of TGA200 and TGA200A	125
B.2.1 Configure the TGA PC Software	127
B.2.2 Initial Alignment	127
B.2.3 Horizontal and Vertical Alignment	130
B.2.4 Focus Adjustment	131
Appendix C. Optimizing Laser Parameters	133
C.1 Laser Temperature	133
C.2 Zero Current	137
C.3 High Current	139
C.3.1 High Current Count	142
C.4 Omitted Data Count	143
C.5 Modulation Current	143
C.6 Laser Maximum Temperature and Laser Maximum Current	144
C.7 Laser Multimode Correction	144
Appendix D. Optimizing Detector Parameters	147
D.1 Detector Gain and Offset	147
D.2 Detector Preamp Gain	147
D.3 Detector Temperature	147
D.4 Detector Linearity Coefficients	148
Appendix E. Calibration	151
Appendix F. TGA Frequency Response	153
F.1 Measurement Rate	153
F.2 Sample Rate	153
F.3 Digital Filters	154
F.4 Synchronicity	156
F.5 Sample Cell Residence Time	157
Appendix G. Using Swagelok® Fittings	159
G.1 General Notes	159
G.2 Assembly	159
G.3 Common Replacement Parts	160
Appendix H. Upgrading Early Generation TGAs to TE-cooled Laser	163
H.1 TGA200	163
H.1.1 Basic Upgrade	163
H.1.2 Detectors	166
H.1.3 Power Module	166
H.1.4 Purge Boot	166
H.2 TGA100A	166
H.2.1 Basic Upgrade	166
H.2.2 Detectors	167
H.2.3 Holes in Enclosure for Cryocooler Refrigerant Tubes	167
H.2.4 Temperature Control Upgrade	167
H.2.5 Power Module	168
H.2.6 Purge Boot	168
H.3 TGA100	168
H.3.1 Basic Upgrade	168
H.3.2 CPU Module	168
H.3.3 Input and Output Modules	168
H.3.4 Detectors and Detector Cables	169
H.3.5 Temperature Controller	171
Appendix I. Install Temperature Control Upgrade	173
I.1 Install Thermistor Probes	173
I.2 Connect the Control Cable	175
I.3 Enter Control Parameters	176
I.4 Testing	176
I.1 Operation	177

Match case Limit results 1 per page

TGA Series Trace Gas Analyzers

Initial Inspection

•

Upon receipt of a Campbell Scientific TGA, inspect the packaging and

contents for damage.

File damage claims with the shipping company.

Contact Campbell Scientific to facilitate repair or replacement.

•

Immediately check package contents against shipping documentation.

Thoroughly check all packaging material for product that may be trapped

inside. Contact Campbell Scientific about any discrepancies. Model

numbers are found on each product. On cables, the model number is often

found at the connection end of the cable. Check that correct lengths of

cables are received.

•

The TGA200A ships with the separate items listed in TABLE 3-1.

TABLE 3-1.

Parts Included with the TGA200A

Part Number

Description

15895

TGA Accessory & Tool Pack

15836

TGA Leak Check Nozzle, 25ft tubing

15838

TGA Test Intake, 5ft tubing

22178

TGA200A SDM Cable, 20ft

15702

Raw Plastic Tubing 1/4 in OD X .040 Wall

Polyethylene/Alum

18148

10Base-T CAT5 Ethernet Crossover Cable, 25ft

20730

9-Pin Female to 9-Pin Male Serial Data Cable, 25ft

30723

TGA TEC

Support Software & OS

30981

TGA200A Power Module

Overview

The optical source of Campbell Scientific TGAs is a tunable diode laser that is

simultaneously temperature and current controlled to produce a linear

wavelength scan centered on a selected absorption line of the trace gas. A

beamsplitter allows most of the energy from the laser to pass through a 1.5 m

(4.9 ft) sample cell, where it is absorbed proportional to the concentration of

the target gas. The portion of the beam that is reflected by the beamsplitter

passes through a reference cell containing a prepared reference gas having a

known concentration of the target gas. The reference signal provides a

template for the spectral shape of the absorption line, allowing the

concentration to be derived independent of the temperature or pressure of the

sample gas or the spectral positions of the scan samples. The reference signal

also provides feedback for a digital control algorithm to maintain the center of

the spectral scan at the center of the absorption line. The simple optical design

avoids the alignment and contamination problems associated with multiple-

path absorption cells. The number of reflective surfaces is minimized to

reduce errors caused by Fabry-Perot interference.