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TA Instruments TGA 2950 User Manual
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TA I
NSTRUMENTS
TGA 2950
i
Thermal Analysis & Rheology
TGA 2950
Thermogravimetric Analyzer
Operator’
s Manual
PN 925602.001 Rev. D (Text and Binder)
PN 925602.002 Rev. D (Text Only)
Issued July 2000
2
Table of Contents
default chapter
3
Table of Contents
3
Notes, Cautions, and Warnings
13
Safety
15
Using this Manual
18
CHAPTER 1: Introducing the TGA 2950
22
Introduction
23
Components
24
The 2950 Instrument
25
2950 Display
25
2950 Keypad
26
HEATER Switch
30
POWER Switch
30
Accessories
31
Gas Switching Accessory
31
Other Accessories
31
Specifications
32
CHAPTER 2: Installing the TGA 2950
35
Unpacking/Repacking the 2950
37
Unpacking the 2950
37
Repacking the 2950
40
Installing the Instrument
41
Inspecting the System
42
Choosing a Location
43
Filling the Heat Exchanger
44
Connecting Cables and Gas Lines
46
Heat Exchanger Cable and Water Lines
46
GPIB Cable
49
Purge Lines
51
Cooling Gas Line
52
Power Cable
53
Unpacking the Balance
54
Installing the Hang-Down Wires
56
Aligning the Sample Hang-Down Wire
59
Adjusting the Sample Platform
63
Starting the 2950
64
Shutting down the 2950
66
CHAPTER 3: Running Experiments
67
Overview
69
Before You Begin
69
Calibrating the TGA
71
Temperature Calibration
71
Weight Calibration
72
Sample Platform Calibration
72
Running a TGA Experiment
73
Experimental Procedure
73
Preparing Samples
74
Selecting Sample and Tare Pans
74
Taring the Sample Pan
75
Automatic Tare
76
Manual Tare
76
Loading the Sample
77
Setting up an Experiment
80
Setting up Accessories
81
Using the Air Cool Option
82
Using a Purge Gas
82
Using the Gas Switching Accessory
85
Starting an Experiment
86
Stopping an Experiment
87
Unloading the Sample
87
Use in an Oxygen-Free Atmosphere
88
Purge Gas System
88
Instrument Set-Up
89
CHAPTER 4: Technical Reference
91
Description of the TGA 2950
93
Components
95
Balance
96
Sample Loading Assembly
98
Furnace
99
TGA Standard Furnace
99
EGA Furnace
101
Cabinet
103
Heat Exchanger
105
Theory of Operation
106
Status Codes
107
CHAPTER 5: Maintenance and Diagnostics
113
Overview
115
Routine Maintenance
116
Inspection
116
Cleaning the Instrument
116
Cleaning the Furnace Housing
117
TGA Standard Furnace Only
117
Heat Exchanger
118
Maintaining Heat Exchanger Coolant
118
Draining and Refilling the Water Reservoir
118
Replacing the Thermocouple
121
Removing and Reinstalling the Furnace
123
Furnace Removal
123
Furnace Replacement
126
Diagnosing Power Problems
128
Fuses
128
Power Failures
130
The Confidence Test
131
Replacement Parts
133
Appendix A: Ordering Information
137
Appendix B: High Resolution TGA Option
139
Overview
143
Option Installation
144
Using Hi-Res TM TGA
145
Background
145
The TA Instruments Hi-Res
146
Technique
146
The Hi-Res TM Ramp Segment
147
Calcium Oxalate Example Scans
151
Advanced Hi-Res TM Techniques
156
What Can be Resolved and What Cannot
156
Selecting a Hi-Res TM Technique
160
Dynamic Rate Hi-Res
160
TM Ramp
160
Constant Reaction Rate Hi-Res TM Ramp
161
Weight Gain Experiments
164
Signature Analysis
165
Sample Quantity and Orientation
166
Exposed Surface Area
166
Bubble Formation
167
Thermocouple Placement
170
Data Analysis Effects
170
Derivative Plots
171
Adjusting Heating Rate
172
Adjusting Resolution Setting
175
Useful Resolutions Settings
177
Temperature Calibration
179
Hi-Res TM Transition Temperatures
180
Hi-Res TM Sensitivity Segment
181
Understanding Sensitivity Setting
182
Adjusting Sensitivity in Dynamic Rate Mode
183
Adjusting Sensitivity in Constant Reaction Rate Mode
185
Abort Segment
189
Stepwise Isothermal Heating
191
Hi-Res TM TGA Examples
196
Mixture of Bicarbonates
196
Dynamic Rate Scans
197
Varying Resolution Setting
199
Varying Sensitivity Setting
200
Constant Reaction Rate Scans
201
Stepwise Isothermal Scans
203
Monosodium Glutamate
206
Banana Taffy
207
Plastic Laboratory Tubing
209
References
213
APPENDIX C: TGA 2950 Autosampler Option
215
Introducing the Auto TGA
217
Getting Started
219
The TGA 2950 Instrument
220
Calibrating the Auto TGA
224
Running Experiments
225
Preparing the Samples
226
Selecting Sample
226
And Tare Pans
226
Taring the Sample Pans
227
Loading the Samples
230
Setting up an Experiment
232
Manual Operation
233
Tracking the TGA Autosampler Status
233
Interrupting a Run
234
Appendix D: TGA 2950 EGA Furnace Option
235
Introducing the EGA Furnace
237
EGA Furnace Specifications
239
Installing the EGA Furnace
240
First-Time Installation
240
Removing and Reinstalling the EGA Furnace
248
EGA Furnae Removal
248
EGA Furnace Installation
250
Connecting the Spectrometer
252
Using the EGA Furnace
255
Cleaning the Quartz Furnace Tube
256
Index
259
4
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TA Instruments TGA 2950 Specifications
General
Brand
TA Instruments
Model
TGA 2950
Category
Measuring Instruments
Language
English
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