ATD Tools 5928 Guía de usuario Pagina 10

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Contents
vi
Ambient Pressure Calibration .................................... 259
Checking the Pneumatics for the
TurboMatrix Series PPC Units...................................260
Tube and Trap Impedance Calibration for
the TurboMatrix 650 ATD ......................................... 262
Removing and Replacing the Cold Trap....................269
Removing the Cold Trap .....................................270
Replacing the Cold Trap...................................... 275
Cold Trap Maintenance..............................................277
Conditioning the Trap.......................................... 277
De-Icing the Cold Trap........................................278
Repacking the Cold Trap.....................................279
Changing the Trap Filter Disks............................281
Packing Sample Tubes ............................................... 284
Stainless Steel Tubes ........................................... 285
Glass and Glass-Lined Stainless Steel Tubes......285
Gauze-Loading Accessory...................................286
Conditioning Packed Sample Tubes.................... 287
Storage and Lifetime of Packed Tubes................ 290
Cleaning the ATD Sample Tray.................................291
Changing the Fuse......................................................291
Theory of Thermal Desorption ...................295
Introduction ................................................................297
Manual Pneumatics..............................................297
Programmable Pneumatic Control (PPC)............ 297
Modes of Operation............................................. 299
Trap Clean Mode........................................................ 301
Tube Conditioning......................................................301
Two-Stage Desorption - Sample Analysis .................303
Overlapping Tube Desorption ............................. 306
Automated Leak Testing ............................................307
Pressurization of the Tube for Leak Testing........307
Primary and Secondary Leak Test of the
Sample Tube ........................................................ 308
Leak Testing the Cold Trap.................................309
Number of Leak Test Retries............................... 309
Carrier Gas Purge of the Sample Tube.......................310
Cold Trap Flow Configuration...................................313
Single-Stage versus Two-Stage Desorption...............314
Single Stage (Non-PerkinElmer)......................... 314
Two Stage Desorption (PerkinElmer ATD) ........315
Practical Applications of Thermal Desorption...........316
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